JPH0533014A - Production of composite member - Google Patents

Abstract

PURPOSE:To produce a composite member using whiskers. CONSTITUTION:A prescribed amt. of whiskers is put in a pressing mold, a member is embedded in the whiskers and the whiskers are allowed to penetrate into the surface of the member by pressing from the outside of the whiskers to produce a composite member. A prescribed amt. of whiskers is put in a capsule, a member is embedded in the whiskers, the capsule is hermetically sealed and the whiskers are allowed to penetrate into the surface of the member by applying cold isostatic pressure to the entire capsule to produce a composite member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a composite member in which whiskers are dispersed and composited on the surface of a metal or resin material as a matrix.

[0002]

2. Description of the Related Art The following conventional techniques are known for composite materials. For example, a composite material (FRM) is manufactured by making a preform from fibers such as SiC or C or whiskers, setting it in a mold, then pouring a molten metal such as an Al alloy, and impregnating the preform with pressure. Is the method.

Further, there is a compocast method in which particles such as SiC and C are added to a molten metal which is completely melted or partially melted, and mechanical stirring is applied to the molten metal to form a composite material (MMC).

Furthermore, a method (powder metallurgy) for mixing composites of particles such as SiC and C and powders such as Al alloy, and producing a composite material by isostatic pressing, hot extrusion, or sintering has been widely used. There is.

Further, particles such as SiC and C are mixed with powder such as Al alloy, and mechanical stirring is applied to this powder in cold or hot to knead the particles such as SiC and C into the alloy powder, There is a method of using a particle-dispersed composite material (mechanical alloying method).

[0006]

DISCLOSURE OF THE INVENTION The present invention is directed to a member having a composite layer formed mainly of whiskers on the outer surface of a material such as a metal or a resin or a part thereof, which is described above. In addition, composite materials manufactured by powder metallurgy and mechanical alloying methods have traditionally been targeted for materials in which ceramic particles and the like are uniformly dispersed throughout the material, and whiskers are partially compounded by the method of the present invention. There is no example of producing a crushed member. Further, the alloy powder used in the powder metallurgy method and the mechanical alloying method is expensive, and many steps are required to obtain a finished product, and the product shape is limited to a simple one. On the other hand, in the method using the preform, first, whiskers are added to an aqueous solution or an organic solvent to form a slurry, which is poured into a filtration device, filtered, dehydrated, and dried to produce a preform. Then, after setting this preform in the mold as described above, a method of pouring a molten metal such as an Al alloy serving as a matrix and performing pressure casting is adopted, and in order to manufacture a composite member,
It has the drawback of being very time-consuming.

The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-mentioned problems and to provide a method for manufacturing a composite member in which the surface layer is composited with whiskers or the like.

[0008]

According to the present invention, in accordance with the above object, a predetermined amount of whiskers is housed in a pressurizing mold, a member is embedded in the whiskers, and the whiskers are pressed from the outside to press the member surface. The present invention is a method for producing a composite member in which whiskers are infiltrated, and the present invention also stores a predetermined amount of whiskers in a capsule, and after embedding the member in the whisker to seal the capsule, hydrostatic pressure is applied to the entire capsule. The above problem was solved by providing a method for producing a composite member in which whiskers penetrate into the surface of the member.

The present invention will be described in detail below with reference to the drawings. In the present invention, ceramic whiskers such as SiC whiskers are used.

As the matrix member,
Members made of various metals, synthetic resins, and other usable materials can be used.

First, as shown in FIG. 1, a predetermined amount of the whiskers 3 are accommodated on the lower punch 2 in the pressure die 1 which has been preheated to a predetermined temperature. In this case, the whiskers 3 are also preheated. Next, the component 4 made of metal or resin, which is heated to a predetermined temperature, is embedded in the whisker 3 in the pressure mold 1. Alternatively, the components 4 may be embedded in the whiskers 3 and then both may be heated at the same time.

Next, from the upper side of the whisker 3 in the pressure die 1 in which the component 4 is embedded, an upper punch 5 is used to form 10 to 1
A pressure P ₁ of 50,000 kgf / cm ² is applied to allow the whiskers 3 to penetrate the entire surface of the component 4. As a result, a component having a composite layer with whiskers formed on the component surface is obtained. The above treatment may be performed in a vacuum or in an atmosphere of an inert gas in order to prevent oxidation of the parts. FIG. 2 shows an enlarged cross-sectional view of the surface layer of the component 4 thus treated.

Next, as another method, as shown in FIG. 3, whiskers are first filled in a pressurizing outer cylinder (hereinafter, referred to as a capsule) 7 to be subjected to pressurization, and then a part such as metal or resin is filled. Embed 4 in it. The inside of the capsule 7 is depressurized and sealed. After that, the whole temperature of this capsule is 10 to 10,000k as a predetermined temperature (1,200 ° C or lower).
Hydrostatic pressure of gf / cm ² (eg CIP or HIP) P ₂
Is applied from the outside of the capsule 7 to push the whiskers on the surface of the component to form a composite layer. In this way, a composite layer as shown in FIG. 2 is obtained in the same manner as the above method.

In each of the above methods, different types of whiskers (having different lengths, aspect ratios, types, etc.) may be used. Also, a mixture of whiskers with other ceramic particles can be used. In this case, a composite layer having the respective characteristics can be formed.

The composite member manufactured by the above method becomes a member having strength, composition, wear resistance, heat resistance and the like superior to the original member and the matrix material. If necessary, the surface of the member may be partially masked by plating or the like to form a member having no composite layer. The whisker should have the smallest length and diameter.

[0016]

【Example】

1) JIS SPCC mild steel capsule (outer diameter φ25,
Height 35) diameter 0.1-1 μm, length 30-100
μm, aspect ratio 50-200 (whisker length /
A SiC whisker (having a diameter ratio) was filled therein, and a JIS MC3 Mg alloy component was embedded therein, and the inside of the capsule was depressurized to about 10 ⁻⁴ torr and then welded and sealed. After that, a hydrostatic pressure of 2,000 kgf / cm ² was applied for 2 hours while heating the whole to 480 ° C. by a HIP device. By this treatment, the layer thickness is about 10μ on the component surface.
m composite layers could be produced. 2) JIS SPCC mild steel capsule with a diameter of 0.1
~ 1 μm, length 30 ~ 100 μm, aspect ratio 50 ~
200 SiC whiskers and Al ₂ O ₃ with a particle size of 5 μm
A mixture of particles in a mass ratio of 9: 1 was filled, a JIS A2024 Al alloy part was embedded in the mixture, the inside of the capsule was depressurized to about 10 ⁻⁴ torr, and then sealed by welding.
After that, a hydrostatic pressure of 2,000 kgf / cm ² was applied for 2 hours while heating the whole to 480 ° C. by a HIP device. This made it possible to manufacture a composite part having a layer thickness of about 10 μm and having a composite layer of both whiskers and particles.

[0017]

According to the present invention, in manufacturing a composite member using whiskers, a preform by whiskers is not required, and preform manufacturing can be omitted. If whiskers mixed with ceramic particles or the like are used, it is possible to obtain whiskers having more excellent abrasion resistance than whiskers and ceramic particles having stronger strength.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a working procedure of a manufacturing method according to the present invention.

FIG. 2 is an enlarged cross-sectional explanatory view of a composite component manufactured by the manufacturing method according to the present invention.

FIG. 3 is an explanatory view of another embodiment of the manufacturing method according to the present invention.

[Explanation of symbols]

1 Pressurized type 2 Lower punch 3 whiskers 4 parts 5 Upper punch

Claims (3)

[Claims] 1. A composite member, characterized in that a predetermined amount of whiskers is housed in a pressure mold, a member is embedded in the whiskers, and the whiskers are pushed into the surface of the member by pressurizing the whiskers from the outside of the whiskers. Production method. 2. A predetermined amount of whiskers is contained in a capsule, a member is embedded in the whisker to seal the capsule, and then hydrostatic pressure is applied to the entire capsule to allow the whisker to enter the surface of the member. And a method for manufacturing a composite member. 3. The method for producing a composite member according to claim 1, wherein the whiskers are a mixture with ceramic particles.