JP6397204B2 - Metal porous body - Google Patents

Description

  The present invention relates to a porous metal body that can control the amount of openings by changing the external field.

  A metal porous body formed by winding a metal wire around an axis is conventionally known. Patent Document 1 proposes a metal porous body used as a filter for removing unnecessary substances and the like from the fuel of an internal combustion engine. The metal porous body is formed by winding a metal wire such as a stainless steel wire around an axis to form a cylindrical shape, and then sintering the wires.

  Patent Document 2 proposes a metal porous body used as a filter for an airbag inflator. This metal porous body uses a single metal wire having a rectangular cross section (flat rectangular shape), one end of the wire is locked in place on the jig, and the wire is wound around the jig to form a cylindrical body. Then, the other end of the wire is joined to an appropriate position of the cylindrical body, and a jig is extracted from the cylindrical body to form a hollow shape.

  Patent Document 3 proposes a technique aimed at providing a metal fiber three-dimensional structure and the like having an excellent shape memory property and superelastic property, in which an intermetallic compound is formed at the contact portion of the metal fiber. In this technique, pure titanium fibers and pure nickel fibers form a three-dimensional structure having a predetermined porosity, and an intermetallic compound is formed at the contact portion between both fibers. Such a metal fiber three-dimensional structure is a non-woven structure having a high porosity, and has high shape retention and shape memory characteristics, so that it is a coronary stent, an artificial bone, an artificial tooth root, and an electric device. It is said that a member having a complicated shape such as an electrode and a filter of an air conditioner can be easily manufactured.

JP 2011-178212 A Special table 2009-533221 gazette JP 2006-241582 A

  The conventional metal porous body for filter application proposed in Patent Documents 1 and 2 joins metal wires by sintering, eliminates the movement of the wires, and fixes the amount of openings to maintain a stable filter function. Is manufactured. However, if the opening amount can be arbitrarily changed, various filter applications may be expanded.

  Moreover, the metal fiber three-dimensional structure proposed in Patent Document 3 has high shape retention due to an intermetallic compound having shape memory characteristics formed by a contact portion between pure titanium fiber and pure nickel fiber. Has been. However, even in such a metal fiber three-dimensional structure, if the amount of openings can be arbitrarily changed as described above, various filter applications may be expanded.

  Note that the metal porous body proposed in Patent Document 3 has nickel fibers remaining in the three-dimensional structure, and therefore it is necessary to take measures against nickel elution, for example, when used as a medical material. In addition, since only the contact portion between the pure titanium fiber and the pure nickel fiber becomes a joint portion, it cannot be denied that a portion other than the joint portion may fall off during use.

  The present invention has been made to meet the above-mentioned demands and to solve the above-mentioned problems, and its purpose is to arbitrarily change the degree of opening of a metal porous body that can be used for a filter or the like. The object is to provide a new metal porous body.

  The metal porous body according to the present invention for solving the above problems is a tube-shaped porous body winding portion formed by joining metal wires wound in layers, and the shape is deformed in an external field such as a temperature or a magnetic field. And the shape deforming member is disposed so as to deform the porous body winding portion.

  In the metal porous body according to the present invention, the shape deformable member can be configured to be a shape memory alloy or a magnetostrictive material.

  In the metal porous body according to the present invention, the shape deforming member is provided or joined in the tube-shaped porous body winding portion, or along the outside of the tube-shaped porous body winding portion. It is preferable that they are joined together.

  According to the metal porous body according to the present invention, since the shape deforming member is joined to the porous body winding portion, the shape deformation is caused by applying an external field such as a temperature or a magnetic field to the metal porous body. The member can be deformed to deform the porous body winding portion. As a result, the amount of openings in the porous body winding portion can be changed, and unlike conventional filters in which the amount of openings is fixed, it can be used as various filters.

It is explanatory drawing which shows the example of the metal porous bodies which concern on this invention. (A) is an example in which the shape deforming member is linearly joined to the inner surface of the porous body winding portion, and (B) is an example in which the shape deforming member is placed along the outer surface of the porous body winding portion. ) Is an example in which the shape deforming member is spirally joined to the inner surface of the porous body winding portion, and (D) is an example in which the shape deforming member is spirally joined to the outer surface of the porous body winding portion. It is the photograph (A) of the metal porous body shown to FIG. 1 (A), and the photograph (B) after deform | transforming the metal porous body. It is a cross-sectional photograph of a metal porous body. It is the enlarged view which showed only the layer which consists of a wire which forms a porous body winding part for two layers. It is explanatory drawing which shows the winding angle which the wire which comprises a porous body winding part makes. It is explanatory drawing of the bubble point test method.

  The metal porous body according to the present invention will be described with reference to the drawings. The technical scope of the present invention is not limited only to the following description and drawings.

  As shown in FIGS. 1 to 4, the metal porous body 10 (10 </ b> A to 10 </ b> D) according to the present invention is a tube-shaped porous body winding portion 1 formed by joining metal wires 2 and 2 that are wound in layers. And a shape deforming member 4 whose shape is deformed in an external field such as a temperature or a magnetic field, and the shape deforming member 4 is disposed so as to deform the porous body winding portion 1.

  Since the metal porous body 10 is arranged so that the shape deforming member 4 deforms the porous body winding portion 1, an external field such as a temperature or a magnetic field is given to the metal porous body 10, The shape deformation member 4 can be deformed to deform the porous body winding portion 1. As a result, the opening amount of the porous body winding portion 1 can be changed. For example, when a shape memory alloy is used as the shape deforming member 4, the open state of the metal porous body 10 that has been in a predetermined open state at room temperature is expanded or reduced by heating, and then returned to normal temperature. The original opening state can be restored. For example, in the filter application, the enlargement or reduction has an advantage that the filter effect based on the change in the opening amount can be changed by heating the metal porous body 10. The metal porous body 10 can be used as various filters, unlike a conventional filter in which the opening amount is fixed.

  Hereinafter, components of the metal porous body 10 will be described in detail.

[Porous body winding part]
The porous body winding part 1 is a tube-like winding part formed by joining the metal wires 2 and 2 that are overlapped and wound together. The tube-shaped porous body winding part 1 may be open at both ends in the longitudinal direction, or may be open at one end in the longitudinal direction and closed at the other end.

(Metal wire)
Although the kind of metal wire 2 is not specifically limited, For example, a stainless steel wire, a titanium wire or its alloy wire, a nickel wire or its alloy wire, etc. can be used. Examples of stainless steel wires include austenitic stainless steel wires such as JIS standard SUS304 wire and SUS316L wire. Nickel alloy wires include, for example, alloy wires in which molybdenum or chromium is added to a nickel base (for example, hastelloy wires (Hastelloy is a registered trademark)), nickel-based, iron, chromium, niobium, molybdenum, etc. An alloy wire (for example, Inconel wire (Inconel is a registered trademark)) can be used. Such a metal wire 2 has heat resistance, chemical resistance, and corrosion resistance.

  The shape of the metal wire 2 is preferably a flat wire obtained by rolling a round wire. The diameter of the round wire before rolling is preferably in the range of 0.05 mm or more and 0.2 mm or less, for example. The round wire is crushed by being rolled, stretched in the width direction, and compressed in the thickness direction perpendicular to the width direction. The rolling rate of the metal wire 2 after being rolled is preferably in the range of 20% or more and 70% or less. “Rolling ratio” means that the diameter of the round wire before rolling is d1, and the thickness in the thickness direction (compressed direction) of the flat wire after being rolled and compressed is d2. The numerical value represented by the following equation (1). (Rolling ratio) = [(d1-d2) / d1] × 100 (1)

(Porous body winding part configuration)
As shown in FIG. 4, the porous body winding portion 1 includes a layer 11 formed by winding a metal wire 2 in one direction and winding it around a shaft at a predetermined pitch, and the metal wire 2 is in the one direction. The layers 12 formed by being inclined in a direction opposite to the direction and wound around the axis at a predetermined pitch are sequentially laminated, and the metal wires 2 and 2 are joined to each other. FIG. 4 shows only two layers (the layer of reference numeral 11 and the layer of reference numeral 12) formed by the metal wire 2 constituting the metal porous body 10. The number of layers is set to 500 layers to 3000 layers according to the thickness of the porous body winding portion 1. For example, in the case of the below-mentioned Example, it is set to 1000 layers-1500 layers. The porous wire winding portion 1 is sintered to join the metal wires 2 and 2 together.

  As shown in FIG. 5, the winding angle θ of the metal wire 2 is an angle at which the porous body winding portion 1 can be formed within a range of 5 ° or more and less than 90 °. More specifically, the winding angle is in the range of 40 ° to 80 °. The “winding angle” is an angle represented by θ in FIG. 5, the metal wire 11 inclined in one direction, and the metal wire 12 inclined in a direction opposite to the one direction. Means the angle between The porosity of the porous body winding portion 1 is not particularly limited, but is, for example, in the range of 32% or more and 62% or less. Moreover, as a dimension of the porous body winding part 1, it is preferable that the outer diameter is formed in the range of 1 mm or more and 15 mm or less, and the inner diameter is formed in the range of 0.5 mm or more and 14 mm or less.

  The porous body winding portion 1 is a member that can be used for applications such as a filter, a sensor cover, a catheter, a sound deadening material, a foaming material, a diffusion material, and a guide as it is. In addition, the porous body winding part 1 may be configured such that one end in the longitudinal direction is open and the other end is closed, and not only the peripheral surface of the porous body winding part 1 but also the other closed end is used as a filter. Function. Further, the annular porous body winding portion 1 can be used for applications such as a filter, a silencer, a foam, a diffusion material, and a fluid material.

For example, an outer diameter of 1mm or more, at 15mm or less, an inner diameter of 0.5mm or more, the following porous body winding unit 1 14 mm, density 7.75 g / cm ³ or more, 8.06 g / cm ³ within the following ranges If you forming using a stainless steel, as described above in the porosity 32% or more, when within range of 62%, a bulk density of 3.35 g / cm ³ or more, 5.2 g / cm ³ or less in the range Be inside. If the peel strength between the joined metal wires 2 and 2 is within a range of 0.95 N or more and 1.4 N or less, for example, the porous body winding portion 1 can be kinked without using a special jig. Do not deform. That is, even if an external force is applied to the porous body winding part 1 by a human hand and the axial direction in which the porous body winding part 1 extends is curved and deformed into a desired shape, the porous body winding part 1 does not kink. Can be transformed. In the metal porous body 10 according to the present invention, it is particularly preferable to use the porous body winding portion 1 having such properties (not easily kinked). Here, “kink” means that when an external force is applied to the porous body winding portion 1, the porous body winding portion 1 is crushed, and even if the external force is removed from the porous body winding portion 1, the porous body winding portion 1 is crushed. This refers to a phenomenon in which the porous body winding portion 1 is not restored to its original state.

  The “bulk density” is the mass per unit volume obtained by dividing the weight of the product by the volume of the product, which can be expressed by [mass of unit volume = product weight / product volume]. "Is the ratio of the volume of the gap to the total volume of the product, which can be represented by [(material specific gravity-product density) / material specific gravity] x 100, and" peel strength "is the porous body winding part. One metal wire 2 is pulled out from 1, and one drawn metal wire 2 is pulled from the porous body winding portion 1 and peeled off from the porous body winding portion 1 at a portion where one metal wire 2 is joined. This is the power required to be done.

(Method for forming porous body winding portion)
The porous winding portion 1 is formed by winding a rolled metal wire 2 around a core material (not shown), a sintering step of sintering the metal wires wound around the core material, and sintering. A swaging step of swaging the metal wire 2 in a state of being wound around the core material, and a core material extraction step of extracting the core material around which the metal wire material 2 is wound after the swaging process is completed. Yes.

  The winding process is a process of winding the metal wire 2 around the core material to form a tubular member. The winding process is performed using a winder (winding device) that is generally used when the metal wire 2 is wound around the core. The metal wire 2 is wound around the outer peripheral surface of the core material by a winder using a material rolled in advance by a rolling mill, or is wound around the outer peripheral surface of the core material while being rolled inside the winder. When winding the metal wire 2 around the core material, the metal wire 2 is inclined in one direction with respect to the axis of the core material, and is directed from one end side to the other end side of the core material at a predetermined pitch in the axial direction of the core material. Are wound sequentially. Thus, the metal wire 2 wound around the core material forms one layer 11 on the outer peripheral surface of the core material. The metal wire 2 is further wound around the outer periphery of one layer 11 formed in this way, and another layer 12 is formed. At this time, the metal wire 2 is inclined in the direction opposite to the one direction described above with respect to the axis of the core material, and is directed from the other end side of the core material to the one end side at a predetermined pitch in the axial direction of the core material. Wrapped.

  In the winding process, the layer 11 is formed by being inclined in one direction and wound around the core material at a predetermined pitch, and is wound in a direction opposite to the one direction and wound around the core material at a predetermined pitch. And forming the tubular member by sequentially forming the layers 12 formed in this manner and laminating the layers of the metal wire 2.

  The sintering step is a step in which a tubular member made of the metal wire 2 is put together with the core material in a furnace and sintered to join the metal wires together. The furnace may be a vacuum furnace or a furnace containing a reducing gas for preventing oxidation. Sintering is performed at a temperature of 800 ° C. or higher and 1300 ° C. or lower for about 180 minutes. Through such a sintering process, the metal wires are diffusion bonded. Note that this sintering step may be performed in two steps before and after the next swaging step.

  The swaging process is a cold forging process in which the outer diameter of the tubular member made of the metal wire 2 is adjusted to a desired dimension. The swaging step is performed, for example, by rotating the divided molds and reducing the outer diameter of the tubular member while hitting.

  The core material extracting step is a step of extracting the core material from the tubular member made of the metal wire 2 to form the porous body winding portion 1 having a desired inner diameter and outer diameter. The tubular member from which the core material is extracted has a porous body winding portion 1 having an inner diameter that matches the outer diameter of the core material and an outer diameter corresponding to the number of layers of the laminated metal wire 2. .

[Shape deforming member]
The shape deforming member 4 is a member whose shape is deformed in an external field such as a temperature or a magnetic field, and is disposed so that the shape deforming member 4 can be deformed in the porous body winding portion 1. The shape deforming member 4 may be provided in the tubular porous body winding portion 1 or may be provided outside. The shape deformable member 4 is arranged to constitute the metal porous body 10. The shape deforming member 4 shown in FIG. 1 has a circular cross section, but may have a shape other than a circle, for example, a flat shape or a polygon, and is not particularly limited.

(Form)
Specifically, the metal porous body 10 </ b> A shown in FIG. 1A is an example in which the shape deforming member 4 is disposed in the hollow interior of the porous body winding portion 1. In this metallic porous body 10A, the shape deforming member 4 may be joined to the inner surface of the porous body winding portion 1 or may be inserted without being joined. When the shape deforming member 4 is joined to the inner surface of the porous body winding portion 1, the porous body winding portion 1 is also deformed by the deformation of the shape deforming member 4. Even when the shape deforming member 4 is inserted without being joined to the inner surface of the porous body winding portion 1, the porous body winding portion 1 can be bent by bending the shape deforming member 4. The joining at this time may be performed by sintering the shape deforming member 4 and the porous body winding portion 1, and it is desirable to employ joining means selected so as not to adversely affect the application. Examples of the joining means include adhesion with an adhesive, brazing with a brazing material, or welding.

  A metal porous body 10 </ b> B shown in FIG. 1 (B) is an example in which the shape deforming member 4 is disposed outside the porous body winding portion 1. In this metallic porous body 10 </ b> B, the shape deforming member 4 is joined to the outer surface of the porous body winding portion 1 along the longitudinal direction of the shape deforming member 4. Also in this case, when the shape deforming member 4 is bent, the porous body winding portion 1 is also bent. For the joining at this time, it is preferable to employ the same sintering and various joining means as described above.

  A metal porous body 10 </ b> C illustrated in FIG. 1C is an example in which the shape deforming member 4 is disposed inside the hollow of the porous body winding portion 1. In this metal porous body 10 </ b> C, the shape deforming member 4 is provided in a spiral shape in the hollow interior of the porous body winding portion 1. The spiral shape deforming member 4 may be bonded to the inner surface of the porous body winding portion 1 or may be only inserted without being bonded. When the spiral shape deforming member 4 is bonded to the inner surface of the porous body winding portion 1, the deformation of the shape deforming member 4 also deforms the porous body winding portion 1, and the spiral shape deforming member 4 is porous. Even when it is inserted without being joined to the inner surface of the body winding part 1, the porous body winding part 1 can also be deformed by the deformation of the shape deforming member 4.

  In the metal porous body 10C, when the helical shape deforming member 4 expands and contracts like a spring, the porous body winding portion 1 can be expanded and contracted in the longitudinal direction, and the spiral shape deforming member 4 can be deformed. When the deformable member 4 is bent, the porous body winding portion 1 can also be bent. For the joining at this time, it is preferable to employ the same sintering and various joining means as described above.

  A metal porous body 10 </ b> D shown in FIG. 1 (D) is an example in which the shape deforming member 4 is disposed outside the porous body winding portion 1. In this metallic porous body 10D, the shape deforming member 4 is provided along the outer surface of the porous body winding portion 1 along a spiral. The spiral shape deforming member 4 may be joined to the outer surface of the porous body winding portion 1 or may be wound without being joined. When the spiral shape deforming member 4 is bonded to the outer surface of the porous body winding portion 1, the deformation of the shape deforming member 4 also deforms the porous body winding portion 1, and the spiral shape deforming member 4 is porous. Even when wound around the outer surface of the body winding portion 1 without being joined, the porous body winding portion 1 can also be deformed by deformation of the shape deforming member 4.

  In this metal porous body 10D, when the spiral shape deforming member 4 expands and contracts like a spring, the porous body winding portion 1 can be deformed by expanding and contracting in the longitudinal direction. When the deformable member 4 is bent, the porous body winding portion 1 can also be bent. For the joining at this time, it is preferable to employ the same sintering and various joining means as described above.

  2 is a plan view photograph of the metallic porous body 10A shown in FIG. 1A, after a rod-shaped shape memory alloy is inserted as the shape deforming member 4 into the porous body winding portion 1 (FIG. 2). 2 (A)), a state (see FIG. 2 (B)) in which the shape deforming member 4 is deformed to about 90 ° by applying temperature. FIG. 3 is a cross-sectional photograph of the metal porous body 10A shown in FIG. Reference numeral 50 denotes a metal jig along with the metal porous body 10A during polishing.

(Constituent materials)
As the shape deforming member 4, a shape memory alloy or a magnetostrictive material whose shape can be changed by an external field such as a temperature or a magnetic field can be preferably exemplified. Since these materials have a property of expressing a shape change triggered by a change in the ambient environmental temperature or an external force (magnetic field), the shape deforming member 4 and the porous body winding portion 1 are used to form a metal porous material. By configuring the body 10, it is possible to provide a filter tube capable of realizing a wide range of openings.

Specific examples of the shape memory alloy that can be preferably used include binary alloys such as nickel titanium, titanium niobium, and iron palladium. Of these, nickel titanium alloys are preferred. Examples of magnetostrictive materials having shape memory characteristics include ferromagnetic shape memory alloys such as NiMnGa alloys and CoNiGa alloys. Examples of the magnetostrictive material include giant magnetostrictive materials such as Galfenol (registered trademark, Fe—Ga alloy) and Terfenol-D (registered trademark, TbDyFe alloy).

  The shape memory characteristics are defined in JIS H7001: 2009 “shape memory alloy terminology”, and even when an alloy of a certain shape is deformed into a different shape in the state of a low temperature phase (martensite), a stable phase at high temperature (austenite) This is a characteristic of exhibiting a phenomenon of returning to the shape before deformation (also referred to as a shape memory effect) when martensite reverse transformation occurs when heated to a temperature of In the case of a shape memory alloy, it is possible to develop a two-way shape memory effect, so that the amount of openings can be controlled at a low temperature and a high temperature. When the shape memory alloy has a unidirectional shape memory effect, it can be deformed into the shape memorized by the shape memory alloy at high temperatures by joining together with an appropriate spring material, and at low temperatures the spring material It is possible to perform control to enable recovery to the initial shape due to the elastic force (referred to as bias method). In this way, by using a member that assists deformation or suppresses deformation, such as a spring material, together with the shape deforming member 4, it is possible to realize deformation utilizing the function of both, and according to temperature or the like. Aperture amount can be obtained.

The shape memory effect of shape memory alloys is not limited to nickel titanium alloys , but is a phenomenon common to alloys that undergo thermoelastic martensitic transformation, and is composed of elements that constitute alloys that exhibit thermoelastic martensitic transformation. Yes. For example, nickel-titanium alloy is nickel and titanium, titanium-niobium alloy is titanium and niobium, and iron-palladium alloy is iron and palladium, but other elements within the range that does not hinder its shape memory characteristics May be included. As other elements, one or more elements selected from transition elements such as copper, aluminum, vanadium, zirconium, molybdenum, chromium, iron, cobalt, rare earth elements, and inevitable impurities may be included.

  In the case of a magnetostrictive material, the shape can be changed in accordance with the application and unloading of a magnetic field. It can be changed accordingly.

  In the case of a ferromagnetic shape memory alloy, the shape can be changed by both the temperature and the magnetic field. Therefore, the opening amount of the porous body winding portion 1 joined with the shape deforming member 4 made of a ferromagnetic shape memory alloy is It can be changed according to its deformation.

  As shown in FIG. 1, the shape deforming member 4 can be linearly aligned or joined to the porous body winding portion 1, or can be spirally aligned or bonded. The form of the shape deforming member 4 may be a round wire, a rolled rectangular wire or a deformed wire, or a strip-shaped wire. Such a form can be arbitrarily selected according to what shape the porous body winding portion 1 is deformed, the recovery force at the time of shape recovery, and the like.

  The size of the shape deforming member 4 is set by a balance between the force exerted by the porous body winding portion 1 when the shape deforming member 4 is deformed and the force required to deform the porous body winding portion 1. The factor varies depending on whether the shape deforming member 4 is a shape memory alloy, a magnetostrictive material, or a ferromagnetic shape memory alloy. Set the size arbitrarily.

  Joining of the deformable member 4 to the porous body winding portion 1 can be performed by methods such as sintering, welding, brazing, adhesion, and caulking. The joining method, the number of joining points, the joining point interval, and the like at this time can be arbitrarily set in consideration of deformation, recovery, or the amount of openings.

(Application of porous metal)
The metal porous body 10 described above changes its shape by adding or removing an external field according to the properties of the shape deforming member 4, and the shape of the porous body winding portion 1 can be changed by the change. As a result, the shape before applying the external field and the shape when the external field is applied can be changed, and an unprecedented new effect that the degree of opening can be arbitrarily changed can be achieved. Can be used for various filters. Moreover, since the joint part of metal wire 2 and 2 is joined, the metal porous body 10 which can hold | maintain the whole shape without big disorder | damage | failure can be manufactured.

  Such a metal porous body 10 can be applied to various application examples. For example, (a) other powder particles can be introduced into the fluid flowing in the porous body winding portion 1 (which may contain powder fluid) from the outside of the porous body winding portion 1. (A) From the fluid flowing in the porous body winding part 1 (including powdered fluid), fine powder particles can be discharged outside the porous body winding part 1 and classified. (C) Since it is deformed by a temperature or a magnetic field, it is possible to safely discharge and take up substances having auxiliary combustion (flammability) and flammability. Note that various powder fluids including odor particles, fungi, pollen, and the like can be applied as the granular material.

  Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

[Example 1]
SUS 304 (density is 7.93 g / cm ³ ) of material JIS standard, round wire with a wire diameter of 0.06 mm is rolled into a porous winding portion using a metal wire 2 with a rolling rate of 63%. 1 was produced. The produced porous body winding part 1 has an inner diameter of 1.6 mm, an outer diameter of 2.3 mm, a total length of 34.9 mm, and a weight of 0.27 g. The porous body winding portion 1 has a bulk density of 2.61 g / cm ³ and a porosity of 67.2%. The winding angle of the metal wire 2 is 47.4 °. The porous body winding part 1 was produced by the following steps.

  First, a round wire was rolled inside the winder to form a metal wire 2 with a rolling rate of 63%. Next, the rolled metal wire 2 was wound around a ceramic core (not shown) to form a tubular member on the outer peripheral surface of the core. Specifically, first, the metal wire 2 is inclined in one direction with respect to the axis of the core material, and the layer 11 is wound around the core material in one direction in the axial direction of the core material at a constant pitch. Formed. Next, the metal wire 2 is inclined from the outer periphery of the one layer 11 in a direction opposite to the axis of the core material, and wound around the core material in a direction opposite to the axial direction of the core material at a constant pitch. Further, a layer 12 was formed. Such a procedure was repeated 300 times, and a plurality of layers made of the metal wire 2 were formed on the outer peripheral surface of the core material to produce a tubular member on the outer peripheral surface of the core material.

  Next, heat treatment was performed. The heat treatment was performed for 180 minutes by placing the tubular member together with the core material in a vacuum furnace at a temperature of 1180 ° C. By performing such heat treatment, the metal wires 2 were sintered together. Thereafter, the tubular member wound around the outer peripheral surface of the core member was swaged so that the outer diameter of the tubular member was formed to a predetermined dimension. After performing the swaging, the tubular member was placed in the vacuum furnace together with the core material, and heat-treated again. The heat treatment was performed at a temperature of 1180 ° C. for 180 minutes. After the second heat treatment, the core material was removed to obtain a porous body winding portion 1 having a length of 30 mm as shown in FIG.

  As the shape deforming member 4, a nickel titanium shape memory alloy wire having a diameter of 0.5 mm was used. This shape memory alloy wire was cut to a length of 40 mm, inserted into the porous body winding portion 1, and joined to the inner surface of the porous body winding portion 1 with an epoxy adhesive. The shape memory alloy wire exhibited a shape memory effect by heating at 75 ° C., and acted to bend the extended porous body winding portion 1 by 90 ° as shown in FIG. Thereafter, the temperature was lowered from 75 ° C. to 20 ° C. to return to the porous body winding portion 1 having the original linear form.

[Example 2]
Porous material using JIS 304 (density is 7.93 g / cm ³ ), metal wire 2 formed by rolling a round wire having a wire diameter of 0.08 mm to a rolling rate of 40%. The winding part 1 was produced. The produced porous body winding part 1 has an inner diameter of 1.6 mm, an outer diameter of 2.3 mm, a total length of 34.6 mm, and a weight of 0.2 g. The porous body winding portion 1 has a bulk density of 3.02 g / cm ³ and a porosity of 62.2%. Further, the winding angle of the metal wire 2 is 45.9 °. The porous body winding part 1 was produced through the same steps as the porous body winding part 1 produced in Example 1. The porous body winding portion 1 was also deformed in the same manner using the same shape deforming member 4 as in Example 1 for the porous body winding portion 1.

[Example 3]
SUS316L (density is 7.98 g / cm ³ ) of JIS standard, a porous body using a metal wire 2 formed by rolling a round wire having a wire diameter of 0.070 mm to a rolling rate of 40% The winding part 1 was produced. The produced porous body winding part 1 has an inner diameter of 1.6 mm, an outer diameter of 2.3 mm, a total length of 35.1 mm, and a weight of 0.24 g. The porous body winding portion 1 has a bulk density of 3.58 g / cm ³ and a porosity of 55.1%. The winding angle of the metal wire 2 is 47.5 °. This porous body winding part 1 was also manufactured through the same steps as the porous body winding part 1 manufactured in Example 1.

  As the shape deforming member 4, a nickel titanium shape memory alloy wire having a diameter of 0.5 mm was used. This shape memory alloy wire was subjected to a two-way shape memory treatment in a spirally wound form with different lengths at high and low temperatures. In the case of Example 3, the shape at the low temperature (20 ° C.) was 6 mm in inner diameter, 1 mm in pitch, and 30 mm in total length. However, at high temperature (75 ° C.), the total length extended to 45 mm, Correspondingly, the inner diameter decreased compared to that at low temperature, and the pitch increased compared to that at low temperature. Thus, the shape memory alloy wire which performed the two-way shape memory process was joined to the outer surface of the porous body winding part 1 with an epoxy-based adhesive at room temperature (20 ° C.). In addition, this shape memory alloy wire expressed the shape at the time of high temperature by heating at 75 ° C., and acted to extend the porous body winding portion 1 in the longitudinal direction. Then, by reducing the temperature from 75 ° C. to 20 ° C., the temperature was reduced to the original position and returned to the porous winding portion 1 having the original size and shape.

[Example 4]
SUS316L (density is 7.98 g / cm ³ ) of JIS standard, a porous body using a metal wire 2 formed by rolling a round wire having a wire diameter of 0.06 mm to a rolling rate of 40% The winding part 1 was produced. The produced porous body winding part 1 has an inner diameter of 1.6 mm, an outer diameter of 2.3 mm, a total length of 35.1 mm, and a weight of 0.23 g. The porous body winding portion 1 has a bulk density of 3.35 g / cm ³ and a porosity of 58.0%. The winding angle of the metal wire 2 is 46.8 °. This porous body winding part 1 was also manufactured through the same steps as the porous body winding part 1 manufactured in Example 1. For this porous body winding portion 1, the same shape deforming member 4 as in Example 3 was used, and the porous body winding portion 1 could be deformed in the same manner.

  The “bulk density” in Examples 1 to 4 can be expressed by the above-mentioned unit volume mass = product weight / product volume, which is the mass per unit volume divided by the product volume. Yes, the “porosity” is the ratio of the volume of the gap to the total volume of the product that can be expressed by the above-mentioned [(material specific gravity−product density) / material specific gravity] × 100. It means the numerical value obtained by the above equation (1).

[Deformation evaluation]
The porous body winding part 1 produced in Examples 1 to 4 was a porous body winding part 1 that could be freely deformed by human hands without causing kinking. By forming the metallic porous body 10 by combining the porous body winding portion 1 and the shape deforming member 4, the shape deforming member 4 is deformed by applying temperature as an external field, and the porous body winding is deformed by the deformation. The line portion 1 could be deformed.

[Evaluation of opening amount]
As an evaluation of the amount of opening, bubble point measurement was performed using the bubble point measuring apparatus 100, and evaluation was performed based on the result. The bubble point measurement is a method in accordance with ASTM-E-128-61. As shown in FIG. 6, the water tank 101 is filled with isopropyl alcohol 102 at 20 ° C., and the metal porous body 10 is filled with the metal from the liquid surface. It was submerged to a position of 110 mm. The measurement was performed with the metal porous body 10 of Example 1 and Example 3. Both ends were sealed with sealing materials 104 and 105, and the pipe 103 was passed through one sealing material 104. When air is sent to the pipe and the internal pressure is gradually increased, the initial point at which bubbles are generated from the largest hole of the porous body winding part 1 is obtained, and when the internal pressure is further increased, the air flow rate changes. An inflection point called a burst point is obtained. This point can be evaluated as the average pore diameter of the filter. The results are shown in Table 1. From the results in Table 1, it was confirmed that the hole diameter before and after deformation was changed.

DESCRIPTION OF SYMBOLS 1 Porous body winding part 2 Metal wire material 4 Shape deformation member 5 Joint part 10, 10A-10D Metal porous body 11 Layer 12 formed by inclining wire in one direction and winding around the central axis 12 Wire in reverse direction Layer formed by winding around the central axis and tilting

Claims (2)

It has a tube-shaped porous body winding portion formed by joining metal wires that are wound in layers, and a shape deforming member whose shape is deformed by changing a temperature or a magnetic field, and the shape deforming member is in a tube shape A metal porous body, characterized in that the metal porous body is provided in or bonded to the porous body winding portion, or is joined along the outside of the tubular porous body winding portion . The metal porous body according to claim 1, wherein the shape deforming member is a shape memory alloy or a magnetostrictive material.