JPH05117872A - Production of composite member - Google Patents

Abstract

PURPOSE:To form a composite layer with a particle on a surface by coating the surface except a required part with a capsule and impregnating the particle for composite by pressurizing. CONSTITUTION:The capsule 4a with which the surface except the specific part of the parts 4 to be treated is coated is fitted in freely attachably and detachably. Then the parts 4 to be treated is buried, for example, with the specific amount of the ceramic particle 3 having 0.01-100mum particle diameter on the under punch 2 in the press mold 1 heated at 0-1200 deg.C. The ceramic particle 3 is impregnated into the surface of the parts 4 by pressurizing to 10-10000kgf/cm<2> with the upper punch 5. The composite layer is formed on the surface except the part coated with the capsule 4a and the composite member having excellent hardness, wear resistance, heat resistance, tensile strength, fatigue strength, Young's modulus or the like is obtained.

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 particles such as metal and ceramics are compounded on a specific surface by using a material such as metal, intermetallic compound, resin and wood as a matrix.

[0002]

2. Description of the Related Art Regarding composite materials, the following conventional techniques are known. 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. And 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).
Further, a method (powder metallurgy) for mixing composite particles such as SiC and C and powder such as Al alloy, and producing a composite material by hydrostatic pressing, hot extrusion, or sintering is widely used. In addition, 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 particles such as SiC and C into the alloy powder to obtain a particle dispersion composite. There is a method of using as a material (mechanical alloying method).

[0003]

SUMMARY OF THE INVENTION According to the present invention, metal, intermetallic compound, resin, wood and other materials or parts (hereinafter referred to as members) are provided with composite particles such as ceramics on a specific portion on the outer surface thereof. It is intended for a member provided with a composite layer formed by infiltrating particles, and the above-mentioned compocast method, powder metallurgy method and mechanical alloying method is a method of uniformly dispersing particles etc. in the entire material. Yes,
It is not possible to compound only the surface. Further, alloy powder used in powder metallurgy or mechanical alloying is expensive, and many steps are required to obtain a finished product. Further, since the final process of manufacturing the material is extrusion, the shape of the finished product is limited to a simple one. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above problems and to provide a method for manufacturing a composite member in which only a specific portion of a surface layer portion is composited.

[0004]

According to the present invention, in accordance with the above object, a detachable capsule is fitted on a surface other than a specific portion of a member, and a predetermined amount of a composite is housed in a pressurizing mold heated to a predetermined temperature. The above-mentioned member is embedded in the particles for use, and this is pressed from the outside of the particle, or a member in which a removable capsule is attached to the surface other than a specific part is embedded in the particle, and this is further sealed in the cylinder. Then, the above problem was solved by applying pressure from the outside of the member to cause the particles to enter only the surface of the specific portion of the member and form a composite layer with the particles there.

The present invention will be described in detail below with reference to the drawings. The particles targeted in the present invention include ceramics and metals, and examples of the ceramics include SiC, Si ₃ N ₄ , SiO ₂ and Al.
Ceramic particles such as ₂ O ₃ are used. Further, Fe particles or the like is used. As these particles, a mixture of particles and short fibers or a single short fiber may be used. The matrix uses metal, intermetallic compound, resin, wood and other materials. Examples of metals include Al alloys, Mg alloys and other commonly used metals and alloys, and examples of intermetallic compounds include Al.
₃ Ti and the like are used, as the resin material, general resins that are used in ordinary members are used, and as the wood, for example, cypress is used.

First, with respect to the matrix-made component, for example, a metal component, a capsule made of metal, resin or the like is fitted on the surface other than the specific portion where the composite layer is provided. This capsule is manufactured so that it can be attached and detached according to the shape of the component to be treated. That is, as shown in FIGS. 1 and 2, a box-shaped capsule 4a that covers the surface of a component to be treated is manufactured, and the capsule 4a is detachably fitted to the component (vane) 4 as shown in the drawing. If there is a gap between the capsule 4a and the component 4, it is closed with a filler such as resin or a tape.
Next, as shown in FIG. 3, for example, a predetermined amount of the ceramic particles 3 is accommodated on the lower punch 2 in the pressure die 1 which is heated to a temperature of 0 to 1200 ° C. In this case, the ceramic particles 3 are also preliminarily kept at a temperature of 0 to 1200 ° C. in order to facilitate their entry into the surface of the component 4 in the subsequent pressing step. The strength of the composite material is secured by using ceramic particles having a particle diameter of 0.01 to 100 μm. Next, the component 4 in which the capsule 4a is fitted is embedded in the ceramic particles 3 in the pressure mold 1 at a predetermined temperature. The component 4 may be preheated only at the portion where the capsule 4a is not fitted. Further, the component 4 may be embedded in the ceramic particles and heated simultaneously with the ceramic particles. Next, from above the ceramic particles 3 in the pressure mold 1 in which the component 4 is embedded, by the upper punch 5, 1
A pressure P _{1 of 0} to 10,000 kgf / cm ² is applied to inject the ceramic particles 3 into the surface of the component 4. In this case, the ceramic particles 3 are prevented from entering the portion where the capsule 4a is fitted, and the composite layer is formed only on the surface of the exposed portion. In addition, this treatment can perform a plurality of treatments of the component by adjusting the amount of ceramic particles in the mold. After the treatment, the capsule 4a may be removed from the component 4, fitted to the next component in the same manner, and the same treatment may be repeated. 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.

Next, as another method, first, ceramic particles are filled in a cylinder which is to be pressurized later, and then the component fitted with the capsule is embedded therein. The cylinder is depressurized and sealed. After that, as a predetermined temperature (0 to 1200 ° C.) for each cylinder, 10 to 10,000 kgf
Hydrostatic pressure (CIP or HIP) of / cm ² is applied from the outside of the cylinder to form the composite layer on the surface of the component exposed from the capsule. The above method can be applied to rocker arms, sprocket gears, valve lifters, vanes, and other various members. Although the present invention has been described by using the ceramic particles as the composite particles for the matrix member as described above, a specific substance such as Fe particles is pressure-penetrated into a specific matrix member to form a specific composite layer. Can be formed, and the present invention is not limited to the above-mentioned embodiments.

[0008]

[Examples] 1) A vane was produced by cutting using ASTM A390 as a material. Next, a rectangular capsule that covers the part of the vane that is not subjected to the composite treatment,
It was made of a JIS A1050 material having a thickness of 2 mm. The capsule is fitted in a vane (see FIGS. 1 and 2) and preheated to 350 ° C. On the other hand, SiC particles having an average particle diameter of 1 μm heated to 550 ° C. are put into a pressure mold which has been preheated to 300 ° C., and the vane is embedded therein,
A hydrostatic pressure of 100 MPa was applied by the upper punch for 5 minutes.
As a result, as shown in FIG. 4, the composite layer 4b is formed on the specific portion of the surface.
A vane having

2) A valve retainer 8 as shown in FIG. 5 was manufactured by hot forging using JIS AC8A as a material. A capsule 8a having a thickness of 1.5 mm and manufactured by JIS SPCC was fitted therein as shown in FIG. next,
As shown in FIG. 7, a JIS SPCC cylinder 9 is filled with SiC particles 3 having an average particle diameter of 1 μm, and a valve retainer 8 having a capsule 8a fitted therein is buried to form a cylinder 9
The inside of the container was depressurized to about 0.1 Pa and then sealed by welding. Furthermore, while heating the whole to 200 ° C with a HIP device,
Hydrostatic pressure P _{2 of} 100 MPa was applied for 5 minutes, and then the capsule 8a was removed. As a result, as shown in FIG. 8, on the surface of the valve retainer 8 which was not covered with the capsule 8a, a composite layer 8b into which SiC particles had invaded was formed.
The removed capsule 8a was fitted to another similar valve retainer and the same treatment was repeated.

[0010]

According to the present invention, a metal, an intermetallic compound,
By forming a composite layer with particles for composite on a specific surface of resin, wood and other members, in the composite part, hardness, wear resistance,
A material having excellent heat resistance, tensile strength, fatigue strength, Young's modulus, etc. can be obtained. In addition, the capsule itself can be detached and used repeatedly, the method itself is simple, and since only the surface is partially compounded, the amount of ceramic particles used is small, and therefore the treatment method is relatively inexpensive. Is.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a state in which a capsule is fitted to a member (vane) to be treated by the method according to the present invention.

FIG. 2 is an explanatory diagram of a cross section taken along the line AA in FIG.

FIG. 3 is an explanatory diagram of an implementation point of a method according to the present invention.

FIG. 4 is an explanatory view of a member treated by the method according to the present invention.

FIG. 5 is an explanatory diagram of another member (valve retainer) to which the method according to the present invention is also applied.

6 is a cross-sectional explanatory view of a state in which a capsule is fitted to the member shown in FIG.

FIG. 7 is an explanatory diagram showing a state in which another method according to the present invention is applied to the member shown in FIG.

FIG. 8 is an explanatory cross-sectional view of a member processed by the method shown in FIG.

[Explanation of symbols]

 1 Pressurized Type 2 Lower Punch 3 Ceramic Particles 4 Parts (Vane) 4a Capsule 4b Composite Layer 5 Upper Punch 8 Valve Retainer 8a Capsule 8b Composite Layer 9 Tube

Claims (2)

[Claims] 1. A removable capsule is fitted on the surface of the member other than a specific portion, and the member is embedded in a predetermined amount of composite particles contained in a pressure mold heated to a predetermined temperature. Is applied from the outside of the particles to allow the particles to invade only the surface of a specific portion of the member and form a composite layer with the particles therein. 2. A member for which a removable capsule is fitted to the surface other than a specific portion is embedded in the particles for composite use, and these are sealed in a cylinder, and hydrostatic pressure is applied while keeping the whole at a predetermined temperature. And a composite layer is formed only on the surface of a specific portion of the member.