JP5643697B2 - Thermal conduction member - Google Patents

Description

  The present invention relates to a heat conducting member in which a cylindrical ceramic body is covered with a metal tube.

  By exchanging heat from a high temperature fluid to a low temperature fluid, heat can be effectively utilized. For example, there is a heat recovery technique for recovering heat from a high-temperature gas such as combustion exhaust gas from an engine. As the gas / liquid heat exchanger, a tube-type heat exchanger with fins such as an automobile radiator or an air conditioner outdoor unit is generally used. However, in order to recover heat from a gas such as automobile exhaust gas, a general metal heat exchanger has poor heat resistance and is difficult to use at high temperatures. Therefore, a heat-resistant metal or ceramic material having heat resistance, heat shock, corrosion resistance, or the like is suitable. However, refractory metals have problems such as high price and difficulty in processing, high density and heavyness, and low heat conduction.

  Therefore, a heat recovery technique using a ceramic material has been developed. For example, there is a technique for performing heat exchange using a cylindrical ceramic body. In this case, heat exchange is performed by circulating the first fluid inside the cylindrical ceramic body and circulating the second fluid outside. When heat is exchanged between a gas and a liquid using a cylindrical ceramic body, it is necessary to shield the cylindrical ceramic body so that the cylindrical ceramic body does not leak and the two fluids do not mix.

  Thus, a technique for recovering heat by integrating a ceramic honeycomb structure, which is a cylindrical ceramic body, and a metal substrate (metal tube) is disclosed (for example, Patent Document 1).

JP-A-9-327627

  However, when the cylindrical ceramic body and the metal substrate (metal tube) are integrated, the coefficient of thermal expansion differs between the cylindrical ceramic body and the metal substrate (metal tube). There is a case where the degree of expansion and contraction is greatly different between the (metal tube) and the cylindrical ceramic body. In such a case, excessive stress is generated in the cylindrical ceramic body. In particular, when joining by brazing, molten metal joining, or the like, the cylindrical ceramic body or the metal tube can be chemically bonded to the metal provided in these gaps. In the case of such a joining form, heat transfer characteristics can be made very good, but a large thermal (residual) stress is applied during cooling due to the difference in thermal expansion coefficient between ceramics and metal. Also, when at least a part of the product becomes hot, such as when used for heat recovery purposes, it becomes complicated because the stress state is compounded, and it is damaged by repeated heat cycles. Problems are likely to occur. In particular, measures are required for the longitudinal direction (axial direction).

  There is also a method of integrating cylindrical ceramics and metal pipes by shrink fitting, but for cylindrical ceramics and cylindrical metal pipes, the outer and inner diameter tolerances must be managed accurately, and ceramics Processing is indispensable, has the disadvantages of high cost, and does not involve chemical bonding, so the heat transfer characteristics are not as good as brazing or molten metal bonding.

  The subject of the present invention is to relieve the thermal stress caused by the difference in thermal expansion coefficient between the ceramic and the metal while keeping the thermal bonding state when the cylindrical ceramic body is covered with the metal tube, It is to provide a heat conductive member having higher durability.

  The present invention solves the above problems. Specifically, the present invention is the following heat conducting member.

[1] A cylindrical ceramic body having a flow path that penetrates from one end face to the other end face and through which a first fluid that is a heating body flows, and a metal tube that fits to the outer peripheral face of the cylindrical ceramic body; An intermediate member formed of a metal in which soft particles are dispersed by being sandwiched between the cylindrical ceramic body and the metal tube and bonded to the cylindrical ceramic body and the metal tube. The first fluid inside the ceramic body, and the second fluid having a temperature lower than that of the first fluid on the outer peripheral surface side of the metal tube, and the first fluid and the second fluid Thermally conductive member that performs heat exchange.

[2] The soft particles include hollow metal particles, particles mainly composed of expanded graphite, particles mainly composed of scaly graphite, particles mainly composed of earth-like graphite, and particles mainly composed of artificial graphite. The heat conducting member according to the above [1], comprising at least one selected from the group consisting of:

[3] The heat conducting member according to [1] or [2], wherein the soft particles have an average particle diameter of 50 to 2000 μm.

[4] The intermediate material according to any one of [1] to [3], wherein the intermediate material is formed of a brazing material in which the soft particles are dispersed, and is joined to the metal tube and the cylindrical ceramic body by brazing. The heat conduction member as described.

[5] The intermediate material is formed by filling a molten metal containing metal melted while dispersing the soft particles into a gap between the metal tube and the cylindrical ceramic body, and then solidifying the molten metal. The heat conducting member according to any one of [1] to [3], wherein the heat conducting member is joined to the metal tube and the cylindrical ceramic body.

[6] The thermal conductive member according to any one of [1] to [5], wherein the cylindrical ceramic body has a thermal conductivity of 100 W / m · K or more.

[7] The tubular ceramic body according to any one of [1] to [6], wherein the cylindrical ceramic body is a honeycomb structure including partition walls, and a plurality of cells serving as fluid flow paths are defined by the partition walls. The heat conduction member as described.

[8] The heat conduction member according to [7], wherein the honeycomb structure includes silicon carbide.

  The heat conducting member of the present invention is highly resistant to cracking and cracking in the cylindrical ceramic body.

It is the schematic diagram seen from the one end surface of the axial direction which shows the heat conductive member of this invention. It is a perspective view which shows the heat conductive member of this invention. It is the schematic diagram seen from one end surface of the axial direction which shows other embodiment of the heat conductive member of this invention. It is a schematic diagram which shows the heat exchanger containing the heat conductive member of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the present invention.

  FIG. 1 is a view of the heat conducting member of the present invention as viewed from one end face in the axial direction, and FIG. 2 is a perspective view of the heat conducting member. The heat conducting member 10 penetrates from one end face 2 to the other end face 2 and has a cylindrical ceramic body 11 having a flow path through which a first fluid as a heating body flows, and an outer peripheral wall 7 of the cylindrical ceramic body 11. A metal tube 12 fitted to (the outer peripheral surface 7 h), and an intermediate material 13 sandwiched between the cylindrical ceramic body 11 and the metal tube 12 and joined to the cylindrical ceramic body 11 and the metal tube 12. . Then, the first fluid and the second fluid are circulated inside the cylindrical ceramic body 11 and the second fluid having a temperature lower than that of the first fluid is circulated on the outer peripheral surface 12 h side of the metal tube 12. Heat exchange with the fluid can be performed.

  Furthermore, the heat conducting member 10 of the present invention is formed of a metal in which the intermediate material 13 is dispersed with soft particles. When the intermediate member 13 is formed of a metal in which soft particles are dispersed as in the heat conducting member 10 of the present invention, the degree of expansion and contraction between the metal tube 12 and the cylindrical ceramic body 11 is large. Even in different states, since the intermediate material 13 relieves stress, it is difficult for large stress to be applied from the metal tube 12 to the cylindrical ceramic body 11 or from the cylindrical ceramic body 11 to the metal tube 12. As a result, the metal tube 12 and the cylindrical ceramic body 11 are less likely to crack or crack.

  In particular, when the metal constituting the intermediate material 13 disperses soft particles as in the heat conducting member 10 of the present invention, the elastic modulus, yield strength, and yield strength are reduced compared to when the soft particles are not included. To do. As a result, a large stress does not reach the cylindrical ceramic body 11 from the metal tube 12. In addition, the soft particles may be hollow particles from the viewpoint of further reducing the elastic modulus and yield strength.

  In the intermediate material 13 used for the heat conductive member 10 of the present invention, the ratio of the soft particles is usually 5 to 70% by volume. From the viewpoint of reducing the stress caused by the intermediate material 13 and improving the heat conduction characteristics, More preferably, it is 10-50 volume%. When the ratio of the soft particles in the intermediate material 13 is 5% by volume or more, the effect of relaxing the stress caused by the intermediate material 13 can be sufficiently obtained. Moreover, when the ratio of the soft particles in the intermediate material 13 is 70% or less, the heat conduction characteristics can be sufficiently enhanced, and as a result, the heat exchange performance can be further enhanced.

  In the heat conducting member 10 of the present invention, the soft particles include hollow metal particles, particles mainly composed of expanded graphite, particles mainly composed of scaly graphite, particles mainly composed of earth graphite, and artificial graphite. What contains 1 or more types chosen from the group which consists of particle | grains which have as a main component can be used. The soft particles mainly composed of expanded graphite as used herein means that the soft particles contain 50% by mass or more of expanded graphite. Further, with respect to scale-like graphite, earth-like graphite, and artificial graphite, the main component means that the soft particles contain 50% by mass or more of the above-mentioned ones.

  Here, as the particles mainly composed of expanded graphite that can be used as the soft particles described above, for example, expanded graphite particles, particles obtained by pulverizing or granulating expanded graphite particles, and graphite sheets prepared using expanded graphite as a raw material Examples thereof include pulverized particles.

  Examples of the particles mainly composed of scaly graphite that can be used as the soft particles described above include scaly graphite, scaly (lumpy) graphite, and spherical graphite (a product obtained by granulating and spheroidizing scaly graphite). be able to.

  Moreover, as the particle | grains which have the earthy graphite mentioned above as a main component, the particle | grains etc. which granulated the earthy graphite particle or earthy graphite can be mentioned.

  Examples of the above-mentioned particles containing artificial graphite as a main component include those obtained by pulverizing artificial graphite electrodes and pyrolytic graphite made from petroleum / coal fuel.

  Examples of the hollow metal particles that can be used as the soft particles in the heat conducting member 10 of the present invention include hollow iron particles, aluminum particles, and copper particles.

  The soft particles that can be used in the present invention preferably have a specific gravity (density) of 0.1 to 1.0. Thus, when the specific gravity of the soft particles is 0.1 to 1.0, sufficient flexibility can be imparted to the intermediate material 13.

  The soft particles used in the present invention preferably have an average particle size of 50 to 2000 μm. As described above, when the average particle diameter of the soft particles is 50 to 2000 μm, the function of the soft particles is easily exhibited, and the intermediate material 13 can sufficiently exhibit the action of relaxing the stress.

  By integrating the metal tube 12 and the cylindrical ceramic body 11 with the intermediate material 13 interposed therebetween, it is possible to prevent the first fluid and the second fluid from being mixed.

  Moreover, in the heat conductive member 10 of the present invention, from the viewpoint of increasing the heat exchange efficiency by strengthening the chemical bond between the intermediate member 13 and the cylindrical ceramic body 11 and the chemical bond between the intermediate member 13 and the metal tube 12. The intermediate material 13 is preferably formed of a brazing material in which soft particles are dispersed, and is joined to the metal tube 12 and the cylindrical ceramic body 13 by brazing.

  Alternatively, in the heat conduction member 10 of the present invention, from the viewpoint of increasing the heat exchange efficiency by strengthening the chemical bond between the intermediate material 13 and the cylindrical ceramic body 11 and the chemical bond between the intermediate material 13 and the metal tube 12. The intermediate member 13 is formed by filling a molten metal containing molten metal with soft particles dispersed in the gap between the metal tube 12 and the cylindrical ceramic body 11, and then solidifying the molten metal. It is preferable to join the tube 12 and the cylindrical ceramic body 11.

  The cylindrical ceramic body 11 preferably has a thermal conductivity of 100 W / m · K or more. More preferably, it is 120-300 W / m * K, More preferably, it is 150-300 W / m * K. By setting it as this range, heat conductivity becomes favorable and the heat | fever in the cylindrical ceramic body 11 can be efficiently discharged | emitted to the outer side of the metal tube 12. FIG.

  The cylindrical ceramic body 11 is formed of ceramics in a cylindrical shape and has a fluid flow path penetrating from one end surface 2 in the axial direction to the other end surface 2. The cylindrical shape is not limited to a cylindrical shape (columnar shape), but may be a prismatic shape having a quadrangular cross section perpendicular to the axial (longitudinal) direction or other polygonal shape. The cylindrical ceramic body 11 is preferably a honeycomb structure 1 having a partition wall 4 made of a porous body, and a plurality of cells serving as fluid flow paths defined by the partition wall 4. By having the partition wall 4, heat from the fluid flowing through the inside of the cylindrical ceramic body 11 can be efficiently collected and transmitted to the outside. 1 and 2 show an embodiment in which a honeycomb structure 1 in which a large number of cells are formed is used as a cylindrical ceramic body 11. FIG. 3 shows an embodiment in which a ceramic tube having no partition wall 4 and only an outer peripheral wall 7 and having a hollow interior is used as the cylindrical ceramic body 11.

  The cylindrical ceramic body 11 is preferably made of ceramics having excellent heat resistance, and considering heat conductivity in particular, it is preferable that SiC (silicon carbide) having high thermal conductivity is the main component. The main component means that 50% by mass or more of the cylindrical ceramic body 11 is silicon carbide.

  However, the entire cylindrical ceramic body 11 does not necessarily need to be composed of SiC (silicon carbide), and SiC (silicon carbide) may be included in the main body. That is, the cylindrical ceramic body 11 is preferably made of a ceramic containing SiC (silicon carbide).

  However, even if it is SiC (silicon carbide), in the case of a porous body, high thermal conductivity cannot be obtained. Therefore, it is preferable to impregnate silicon in the process of manufacturing the cylindrical ceramic body 11 to obtain a dense structure. High heat conductivity can be obtained by using a dense structure. For example, in the case of a porous body of SiC (silicon carbide), it is about 20 W / m · K, but by making it a dense body, it can be about 150 W / m · K.

As the cylindrical ceramic body 11, Si-impregnated SiC, (Si + Al) -impregnated SiC, metal composite SiC, recrystallized SiC, Si ₃ N ₄ , SiC, or the like can be adopted. Si-impregnated SiC and (Si + Al) -impregnated SiC can be employed to obtain a body structure. Si-impregnated SiC has a structure in which the SiC particle surface is surrounded by solidified metal-silicon melt and SiC is integrally bonded via metal silicon, so that silicon carbide is shielded from an oxygen-containing atmosphere and prevented from oxidation. Is done. Furthermore, SiC has the characteristics of high thermal conductivity and easy heat dissipation, but SiC impregnated with Si is densely formed while exhibiting high thermal conductivity and heat resistance, and has sufficient strength as a heat transfer member. Indicates. That is, the cylindrical ceramic body 11 made of a Si—SiC-based [Si-impregnated SiC, (Si + Al) -impregnated SiC] material has excellent heat resistance, thermal shock resistance, oxidation resistance, and corrosion resistance against acids and alkalis. In addition to showing properties, it exhibits high thermal conductivity.

  When the cylindrical ceramic body 11 is formed as the honeycomb structure 1 in which a plurality of cells 3 serving as flow paths are partitioned by the partition walls 4, the cell shape may be a circle, an ellipse, a triangle, a quadrangle, other polygons, etc. A desired shape may be selected as appropriate from the above.

The cell density of the honeycomb structure 1 (that is, the number of cells per unit cross-sectional area) is not particularly limited, and may be appropriately designed according to the purpose, but is 25 to 2000 cells / in 2 (4 to 320 cells / cm ² ) is preferable. When the cell density is smaller than 25 cells / square inch, the strength of the partition walls 4, and consequently the strength of the honeycomb structure 1 itself and the effective GSA (geometric surface area) may be insufficient. On the other hand, if the cell density exceeds 2000 cells / square inch, the pressure loss when the heat medium flows may increase.

  The number of cells per honeycomb structure 1 is preferably 1 to 10,000, and particularly preferably 200 to 2,000. If the number of cells is too large, the honeycomb itself becomes large, so the heat conduction distance from the first fluid side to the second fluid side becomes long, the heat conduction loss becomes large, and the heat flux becomes small. In addition, when the number of cells is small, the heat transfer area on the first fluid side becomes small, the heat resistance on the first fluid side cannot be lowered, and the heat flux becomes small.

  The thickness (wall thickness) of the partition walls 4 of the cells 3 of the honeycomb structure 1 may be appropriately designed according to the purpose, and is not particularly limited. The wall thickness is preferably 50 μm to 2 mm, and more preferably 60 to 500 μm. If the wall thickness is less than 50 μm, the mechanical strength may be reduced, and damage may be caused by impact or thermal stress. On the other hand, if it exceeds 2 mm, there is a possibility that problems such as a decrease in the cell volume ratio on the honeycomb structure side, an increase in fluid pressure loss, and a decrease in the heat exchange rate through which the heat medium permeates may occur.

The density of the partition walls 4 of the cells 3 of the honeycomb structure 1 is preferably 0.5 to ⁵ g / cm ³ . When it is less than 0.5 g / cm ³ , the partition wall 4 has insufficient strength, and the partition wall 4 may be damaged by pressure when the first fluid passes through the flow path. On the other hand, if it exceeds 5 g / cm ³ , the honeycomb structure 1 itself becomes heavy, and the characteristics of weight reduction may be impaired. By setting the density within the above range, the honeycomb structure 1 can be strengthened. Moreover, the effect which improves heat conductivity is also acquired.

  When the first fluid (high temperature side) to be circulated through the heat exchanger 30 (see FIG. 4) is exhaust gas, a catalyst is formed on the inner wall surface of the cell 3 of the honeycomb structure 1 through which the first fluid (high temperature side) passes. Is preferably carried. This is because in addition to the role of exhaust gas purification, reaction heat (exothermic reaction) generated during exhaust gas purification can also be exchanged. Precious metals (platinum, rhodium, palladium, ruthenium, indium, silver, and gold), aluminum, nickel, zirconium, titanium, cerium, cobalt, manganese, zinc, copper, zinc, tin, iron, niobium, magnesium, lanthanum, samarium, It is preferable to contain at least one element selected from the group consisting of bismuth and barium. These may be metals, oxides, and other compounds.

  The supported amount of the catalyst (catalyst metal + support) supported on the partition walls 4 of the cells 3 of the first fluid circulation part 5 of the honeycomb structure 1 through which the first fluid (high temperature side) passes is 10 to 400 g / It is preferable that it is L, and if it is a noble metal, it is still more preferable that it is 0.1-5 g / L. If the supported amount of the catalyst (catalyst metal + support) is less than 10 g / L, the catalytic action may not be easily exhibited. On the other hand, if it exceeds 400 g / L, the pressure loss increases and the manufacturing cost may increase.

  As the metal tube 12, one having heat resistance and corrosion resistance is preferable. For example, a SUS tube, a copper tube, a brass tube, or the like can be used.

  Next, the manufacturing method of the heat conductive member 10 of this invention is demonstrated. First, a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb formed body. As the material of the honeycomb structure 1, the above-described ceramics can be used. For example, when manufacturing the honeycomb structure 1 mainly composed of a Si-impregnated SiC composite material, a predetermined amount of C powder, SiC powder, binder Then, water or an organic solvent is kneaded to form a clay and molded to obtain a honeycomb molded body having a desired shape.

  The honeycomb formed body is dried and fired by impregnation with Si, whereby the honeycomb structure 1 in which a plurality of cells 3 serving as gas flow paths are partitioned by the partition walls 4 can be obtained.

  Subsequently, a molten metal containing soft particles is prepared by dispersing a desired amount of soft particles in the molten metal, and the molten metal is filled in the gap between the metal tube 12 and the honeycomb structure 1, and then the molten metal is solidified. By doing so, the intermediate material 13 made of a metal in which soft particles are dispersed can be provided between the metal tube 12 and the honeycomb structure 1. In addition, the molten state referred to in this specification is not only a completely molten state, but also a semi-molten state (a state in which solid is solid-liquid coexistence), a semi-solid state (once a liquid is used once, then it becomes liquid-solid coexistence) Including semi-solids).

  As a method of filling the gap between the metal tube 12 and the honeycomb structure 1 with a molten metal, gravity casting, low pressure casting, die casting (high pressure casting) or the like can be used. Die-casting is excellent in cycle time (cost), and it is easy to fill molten metal in a narrow gap. In addition, the low pressure casting has a long cycle time but is excellent in quality, material yield and the like.

  When using molten metal, soft particles may be put in advance in the gap between the metal tube 12 and the honeycomb structure 1, and the molten metal containing molten metal may be filled in the gap.

  Moreover, the metal pipe 12 and the honeycomb structure 1 can also be joined by brazing. In the case of joining by brazing, the honeycomb structure 1 is covered with a metal tube 12 and the gap between the honeycomb structure 1 and the metal tube 12 is filled with a brazing material. As the brazing material, a silver brazing material, a copper brazing material, a brass brazing material, an aluminum brazing material, a Ni brazing material, or the like can be used. As the brazing material, a paste or a sheet in which soft particles are mixed in advance can be used, but a paste is more preferable. If it does not enter at room temperature, the metal tube 12 may be warmed. Then, brazing is performed by raising the temperature above the solidus temperature of the brazing material in a vacuum. In that case, you may braze in the state compressed and corrected with the type | mold from the outer side of 12 between metals. The brazing material filled in the gap becomes the intermediate material 13 by heating and cooling, and the metal tube 12 and the honeycomb structure 1 are joined.

  In the method using the above-described molten metal or brazing material, the intermediate material 13 is chemically bonded to the metal tube 12 and the honeycomb structure 1. In the heat conducting member 10 of the present invention, when the intermediate material 13 is chemically bonded to the metal tube 12 and the honeycomb structure 1, the transmission between the metal tube 12, the intermediate material 13, and the honeycomb structure 1 is performed. The heat becomes better and, as a result, the efficiency of heat conduction increases. Even when the intermediate material 13 is chemically bonded to the metal tube 12 and the honeycomb structure 1, as described above, the intermediate material 13 has an action of relieving stress. A large stress is not easily applied to the honeycomb structure 1 or from the honeycomb structure 1 to the metal tube 12, and as a result, the metal tube 12 and the honeycomb structure 1 are not easily cracked or cracked.

  FIG. 4 is a perspective view of a heat exchanger 30 including the heat conducting member 10 of the present invention. As shown in FIG. 4, the heat exchanger 30 is formed by a heat conducting member 10 (honeycomb structure 1 + intermediate material 13 + metal tube 12) and a casing 21 that includes the heat conducting member 10 inside. The cells 3 of the honeycomb structure 1 of the cylindrical ceramic body 11 serve as the first fluid circulation part 5 through which the first fluid flows. The heat exchanger 30 is configured such that a first fluid having a temperature higher than that of the second fluid flows in the cells 3 of the honeycomb structure 1. In addition, an inlet 22 and an outlet 23 for the second fluid are formed in the casing 21, and the second fluid circulates on the outer peripheral surface 12 h of the metal tube 12 of the heat conducting member 10.

  That is, the second fluid circulation portion 6 is formed by the inner surface 24 of the casing 21 and the outer peripheral surface 12 h of the metal tube 12. The second fluid circulation part 6 is a second fluid circulation part formed by the casing 21 and the outer peripheral surface 12h of the metal tube 12, and includes the first fluid circulation part 5, the partition wall 4 of the honeycomb structure 1, and the intermediate material. 13, which is separated by the metal pipe 12 and can conduct heat, receives heat of the first fluid flowing through the first fluid circulation portion 5 through the partition wall 4, the intermediate material 13, and the metal pipe 12, and circulates the first fluid. Heat is transferred to the heated object which is the second fluid. The first fluid and the second fluid are completely separated, and these fluids are configured not to mix.

  The first fluid circulation portion 5 is formed as a honeycomb structure, and in the case of the honeycomb structure, when the fluid passes through the cell 3, the fluid cannot flow into another cell 3 by the partition wall 4, and the honeycomb structure The fluid travels linearly from one inlet to the outlet. Moreover, the honeycomb structure 1 in the heat exchanger 30 of the present invention is not plugged, so that the heat transfer area of the fluid is increased and the size of the heat exchanger 30 can be reduced. Thereby, the amount of heat transfer per unit volume of the heat exchanger 30 can be increased. Furthermore, since it is not necessary to process the honeycomb structure 1 such as forming plugged portions or forming slits, the heat exchanger 30 can reduce the manufacturing cost.

  It is preferable that the heat exchanger 30 circulates the first fluid having a temperature higher than that of the second fluid and conducts heat from the first fluid to the second fluid. When gas is circulated as the first fluid and liquid is circulated as the second fluid, heat exchange between the first fluid and the second fluid can be performed efficiently. That is, the heat exchanger 30 of the present invention can be applied as a gas / liquid heat exchanger.

  The heating body, which is the first fluid to be circulated through the heat exchanger 30 having the above configuration, is not particularly limited as long as it is a medium having heat. For example, if it is gas, the exhaust gas of a motor vehicle etc. are mentioned. In addition, the medium to be heated, which is the second fluid that takes heat from the heating body (exchanges heat), is not particularly limited as a medium, as long as the temperature is lower than that of the heating body.

  The heat conducting member of the present invention can be used for heat exchange between a heated body (high temperature side) and a heated body (low temperature side).

1: honeycomb structure, 2: end face (in axial direction), 3: cell, 4: partition, 5: first fluid circulation part, 6: second fluid circulation part, 7: outer peripheral wall, 7h: (tubular ceramics) Outer peripheral surface, 10: heat conducting member, 11: cylindrical ceramic body, 12: metal tube, 12h: outer peripheral surface of (metal tube), 13: intermediate material, 21: casing, 22: (second fluid) Inlet), 23: outlet of (second fluid), 24: inner surface of (casing), 30: heat exchanger.

Claims (8)

A cylindrical ceramic body that has a flow path that passes from one end face to the other end face and through which the first fluid that is a heating body flows;
A metal tube fitted to the outer peripheral surface of the cylindrical ceramic body;
An intermediate material formed from a metal in which soft particles are dispersed, sandwiched between the cylindrical ceramic body and the metal tube, joined to the cylindrical ceramic body and the metal tube,
The first fluid is circulated in the cylindrical ceramic body, the second fluid having a temperature lower than that of the first fluid is circulated on the outer peripheral surface side of the metal tube, and the first fluid and the second fluid are circulated. A heat conduction member that exchanges heat with a fluid.   The soft particles are a group consisting of hollow metal particles, particles mainly composed of expanded graphite, particles mainly composed of scaly graphite, particles mainly composed of earth-like graphite, and particles mainly composed of artificial graphite. The heat conducting member according to claim 1, comprising at least one selected from the group consisting of:   The heat conduction member according to claim 1 or 2, wherein the soft particles have an average particle diameter of 50 to 2000 µm.   The heat conduction according to any one of claims 1 to 3, wherein the intermediate material is formed of a brazing material in which the soft particles are dispersed, and is joined to the metal tube and the cylindrical ceramic body by brazing. Element.   The intermediate material is formed by filling a molten metal containing metal melted while dispersing the soft particles into a gap between the metal tube and the cylindrical ceramic body, and then solidifying the molten metal, The heat conducting member according to any one of claims 1 to 3, wherein the heat conducting member is joined to a metal tube and the cylindrical ceramic body.   The thermal conductivity member according to any one of claims 1 to 5, wherein the cylindrical ceramic body has a thermal conductivity of 100 W / m · K or more.   The heat conduction according to any one of claims 1 to 6, wherein the cylindrical ceramic body is a honeycomb structure having partition walls, and a plurality of cells serving as fluid flow paths are defined by the partition walls. Element.   The heat conduction member according to claim 7, wherein the honeycomb structure includes silicon carbide.

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