JP3032254B2 - Manufacturing method of composite spray material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a composite thermal spray material in which a plurality of types of powdery and granular materials are bonded to each other.

[Conventional technology]

Conventionally, as shown in JP-B-61-19583 and JP-A-63-169371, a plurality of types of powdery and granular raw materials are simply stirred and mixed, and then the mixed raw material is heated to mix the granular and raw materials. Had been combined.

[Problems to be solved by the invention]

However, the mixing of a plurality of types of powdery and granular raw materials is insufficient microscopically, the composition of the powdery and granular composite thermal spraying material after bonding is widely varied, and the physical properties of the coating layer after thermal spraying vary depending on the location. There was a disadvantage that it was easy to make a difference.

An object of the present invention is to ensure that a powder-granular composite thermal spray material having a uniform composition can be obtained, and that predetermined physical properties can be reliably imparted to the entire thermal spray coating layer.

[Means for solving the problem]

The characteristic means of the present invention is that, by rotating the casing at a high speed, a plurality of kinds of powdery raw materials are pressed against the inner peripheral surface of the casing by centrifugal force, and the raw material layer formed by the pressing is rotated relative to the casing. The powdered and granular raw materials are stirred and mixed by the action of the scraping pieces, and the plurality of types of powdered and granular raw materials are thermally welded to each other by the heat generated by the action of the grinding pieces. The purpose of the present invention is to produce a granular composite spray material, and its operation and effects are as follows.

[Action]

In other words, a raw material layer is formed on the inner peripheral surface of the casing that rotates at high speed by centrifugal force, and the raw material layer is agitated and mixed with the scraper that rotates relative to the raw material layer. It can be realized sufficiently and efficiently.

And, since the milled pieces are rotated relative to the raw material layer whose movement is restricted by centrifugal force, the milling action can be performed. By the heat generated by the crushing, a plurality of types of powdery and granular raw materials can be reliably welded to each other.

Therefore, the powdery and granular raw materials can be sufficiently mixed and dispersed microscopically, and the composition between the powdery and granular composite thermal spray materials generated by thermal welding can be sufficiently uniform.

〔The invention's effect〕

As a result, it has become possible to easily and surely produce and provide a more excellent composite sprayed material capable of uniformly and surely maintaining the physical properties of the coating layer after spraying over the entirety.

〔Example〕

 Next, examples of the present invention will be described.

As shown in FIG. 1, two kinds of powdery and granular raw materials such as a metal and a wear-resistant ceramic are weighed, and the two kinds of raw materials are supplied to a dry-type grinding and mixing apparatus at a set ratio, and the mixture is supplied by a grinding and mixing apparatus. In the treatment, the two types of raw materials are sufficiently stirred and mixed, and the two types of raw materials are heat-welded by the heat generated by compression and friction to produce a powdery composite spray material.

The composite spray material is, for example, as shown in FIG.
A state in which the granular metal (M) is thermally welded to almost the entire surface of the metallic compound (C) such as a granular ceramic, or a metallic compound such as a granular ceramic as shown in FIG. A film (M) made of a molten and solidified metal is formed almost entirely on the surface of (C).

As ceramics, Al ₂ O ₃ , A1N, BN, CrO, Cr
₂ O ₃ , MgO, NiO, SiC, SiO ₂ , Si ₃ N ₄ , TiC, TiN, TiO ₂ , W
C, ZrN, ZrO ₂ and one or more of these compounds, ZrO ₂ stabilized with CaO, Y ₂ O ₃ , MgO or the like are used.

As the ceramics, for example, the following cermets may be used in which the ceramics are combined with a metal.

That is, Cr ₃ C ₂ -Fe, Cr ₃ C ₂ -Ni-Cr, SiC-Co, SiC-N
i, Si ₃ N ₄ -Co, Si ₃ N ₄ -Ni, TiC-Co, TiC-Ni, TiC-Ni
-Cr, WC-Co, Ni-Al-WC, Ni-Cr-WC and the like.

Metals include Ni alloys such as Fe-Cr, Ni-Al and Ni-Cr alloys, Ag, Al, Co, Cu, Mg, Mn, Mo, Ni, Si, Sn, Ti, T
a, W, and their alloys are used.

The composite thermal spraying material can be thermally sprayed by a gas thermal spraying method, has a higher degree of freedom in processing than a plasma thermal spraying method, can perform thermal spraying with low equipment cost and processing cost, and is portable.

The above-mentioned grinding and mixing apparatus will be described in detail below with reference to FIGS.

A bottomed cylindrical casing (4) forming a processing chamber (3) at the upper end of a vertical rotation shaft (2) mounted on a base (1).
Are mounted concentrically, and the electric motor (5a) and the transmission (5b)
In order to rotate the casing (4) at a high speed so that the raw material in the casing (4) is pressed against the inner peripheral surface (4a) of the casing by centrifugal force, the driving device (5) composed of the above is interlocked with the lower end of the rotating shaft (2). The rotation speed of the casing (4) is adjustable so that an appropriate centrifugal force can be obtained according to the properties of the raw material.

The casing (4) is surrounded by a cover (7), a fan (12) is connected to the lower part of the casing (4), and the outside air is sucked from an air inlet (13) formed in the cover (7) to cover the casing (4). It is configured to discharge the suction outside air from the exhaust pipe (10) connected to 7).

A support (8b) having a conical portion (8c) formed at the upper center thereof is provided in the casing (4) while being fixed to the upper end of the rotary shaft (8a) concentric with the rotary shaft (2). .

Grinding pieces (9a) for compressing and shearing the raw material in cooperation with the inner peripheral surface of the casing (4a), and scraping pieces (9b) for stirring and mixing and dispersing the raw material are appropriately placed in the rotating direction of the casing (4). They are attached to the front end of the support (8a) in a state where they are arranged at intervals and arranged in the processing chamber (3).

The grinding piece (9a) has an inclined surface formed such that a gap between the grinding piece (9a) and the casing (4) becomes narrower toward the opening direction of the casing (4), and the scraping piece (9b) is attached to the casing (4). Is formed in a wedge-like or comb-like manner such that the gap becomes wider toward the rotation direction side of the casing (4), and its working surface becomes gradually wider.

The rotating shaft (8a) is interlocked with the driving device (5), and the milling pieces (9a) and the scraping pieces (9b) are relatively rotated with respect to the casing (4) at a constant speed difference. ), The two materials are heat-welded by the heat generated by the friction caused by the milled pieces (9a), and
The heat-welded material is reduced to several μm by the compression and friction action of milled pieces (9a)
It is configured to granulate into fine spheres of m to several tens μm.

A passage (27) is formed in the rotating shaft (8a) to allow a heating or cooling medium to flow into the support (8b), the milling piece (9a), and the scraping piece (9b), and the passage is formed by a rotary joint (24). (27) is connected to the medium storage tank (26).

In the center of the cover (7), a path (6) for flowing down the raw material from the feeder (19) toward the conical portion (8c) of the support (8b) is formed by attaching a pipe (14). If necessary, a blower (18) for supplying a suitable amount of heated or cooled carrier gas such as air or inert gas is connected to the path (6), and a jacket (25) is provided around the cover (7). And a medium for heating or cooling from the tank (26).

The upper part (7a) of the cover (7) is detachably attached together with the pipes (10) and (14), so that the manufactured composite spray material can be collected.

In short, by rotating the casing (4) at high speed,
The powdery raw material from the feeder (19) is pressed against the inner peripheral surface (4a) of the casing by centrifugal force, and the material layer formed by the pressing is pressed against the grinding pieces (9) that rotate relative to the casing (4).
a) and the scraping piece (9b) are acted on to mix uniformly and the compositional variation between them is small, and several μm to several tens μm.
Thus, a composite spray material in the form of powder granulated to m is manufactured.

(Another embodiment)

 Next, another embodiment will be described.

Raw materials can be appropriately selected in kind, mixing ratio, particle size, and the like. Depending on the raw materials, pulverization may be performed upon mixing. For example, three or more kinds of raw materials may be mixed, and one or more kinds appropriately selected from metals, various metal compounds such as chlorides, nitrides and oxides of metals, low melting point ceramics, plastics and the like may be used. , May be mixed to coat the ceramic. Note that ceramics, metals, metal compounds, low-melting ceramics, and plastics can be appropriately selected from those known as raw materials for composite sprayed materials.

A composite sprayed material in which ceramics are thermally welded to almost the entire surface of each of the particulate metal may be manufactured, or a metal or metal compound different from the particulate metal may be applied to almost the entire surface of each of the particulate metal. A thermally sprayed composite spray material may be manufactured.

The specific configuration of the milling and mixing apparatus can be appropriately changed, for example,
The rotation axis of the casing (4) is inclined or turned sideways, and the grinding pieces (9a) and the scraping pieces (9b) are urged by a fluid pressure or a spring within a range where they do not come into contact with the casing (4). The rotation of the crushed pieces (9a) and scraping pieces (9b) is stopped, and the shape, material,
It is possible to appropriately change the number of installations and the like.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure and the method of the accompanying drawings.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIG.
2 (a) and 2 (b) are conceptual diagrams of the composite thermal spraying material, FIG. 3 is a conceptual diagram of the grinding and mixing apparatus, and FIG. 4 is a view taken along the line IV-IV in FIG. (4) Casing (9a) Grinding pieces (9b)
Scraping pieces.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-8359 (JP, A) JP-A-1-212746 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C23C 4/04-4/10

Claims (3)

(57) [Claims] 1. A method for producing a composite thermal spraying material in which a plurality of types of powdery and granular materials are bonded to each other, wherein a casing (4) is rotated at a high speed to rotate the plurality of types of powdery and granular materials into the casing (4). The peripheral surface is pressed by centrifugal force, and the grinding layer (9a) and the scraping piece (9b), which rotate relative to the casing (4), act on the raw material layer formed by the pressing. ), The powdery and granular raw materials are stirred and mixed,
A method for producing a composite thermal spray material in which a plurality of types of powdery and granular raw materials are thermally welded to each other by the heat generated by the action of the milling pieces (9a) to produce a powdery and granular composite thermal spray material. 2. The method for producing a composite spray material according to claim 1, wherein ceramics and a metal or a metal compound to be bonded to the surface of the ceramics are charged into the casing as the granular material. 3. The method according to claim 1, wherein a metal or an alloy as the powdery raw material and a metal or a metal compound different from the powdery and granular material to be bonded to the surface of the metal or alloy are charged into the casing. Manufacturing method of composite spray material.