JP3070781B2 - Control method of composite layer thickness of composite member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the thickness of a composite layer of a composite member obtained by using a metal or resin material as a matrix and particles such as ceramics on the surface.

[0002]

2. Description of the Related Art With respect to composite materials, the following prior arts are known. For example, a composite material (FRM) is manufactured by fabricating a preform with fibers or whiskers such as SiC or C, setting this in a mold, pouring a molten metal such as an Al alloy, and impregnating the preform with pressure. It is a method.

Further, there is a compo-casting method in which particles such as SiC and C are added to a completely melted or partially melted molten metal and mechanically stirred to give a composite material (MMC).

Further, a method (powder metallurgy) of mixing a particle such as SiC or C with a powder of an Al alloy or the like and manufacturing a composite material by isostatic pressing, hot extrusion, sintering, or the like is widely performed. ing.

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

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a member provided with a composite layer formed by intruding ceramic particles on the outer surface of a metal or resin material or component. In addition, composite materials manufactured by powder metallurgy and mechanical alloying methods have conventionally been intended for materials in which particles and the like are uniformly dispersed throughout the material. There is no example manufactured. Further, the alloy powder used in the powder metallurgy method or the mechanical alloying method is expensive, and it takes many steps to obtain a finished product, and there is a problem that the product shape 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 controlling the thickness of a composite layer of a composite member having a composite surface layer.

[0008]

According to the above object, according to the present invention, ceramic particles are housed in a pressurizing mold or container, an object to be processed is embedded in the ceramic particles, and the ceramic particles are externally applied via the ceramic particles. When a pressure is applied to the workpiece from all directions to form a composite layer with ceramic particles on the entire surface of the workpiece, the thickness of the composite layer to be formed is determined by the pressure, the heating temperature, and the pressure. The above problem was solved by controlling the pressure in combination with the pressure time.

Hereinafter, the present invention will be described in detail with reference to the drawings. Examples of the ceramics targeted in the present invention include SiC, Si ₃ N ₄ , Si
Ceramic particles such as O ₂ and Al ₂ O ₃ are used. The diameter of the ceramic particles is preferably in the range of 0.01 to 100 μm, and it is preferable that the diameter is small in view of the strength of the formed composite layer, or a mixture of different types of ceramic particles may be used.

The matrix uses a metal or resin material. As the metal, an Al alloy, a Mg alloy and other commonly used metals and alloys are used, and as the resin material, general synthetic resins used for ordinary members are used.

First, as shown in FIG. 1, a predetermined amount of the ceramic particles 3 are accommodated on a lower punch 2 in a pressing die 1 at a temperature of 0 to 1200 ° C. In this case, the ceramic particles 3 are also set to a temperature of 0 to 1200 ° C. in advance. This is a measure for facilitating the penetration of the ceramic particles into the component surface in a later step.

Next, a metal or resin part 4 at a predetermined temperature is embedded in the ceramic particles 3 in the pressing die 1. The component 4 is embedded in the ceramic particles 3 and both are heated simultaneously.

Next, from above the ceramic particles 3 in the pressing mold 1 in which the component 4 is embedded, 10 to 1
A pressure P ₁ of 000 kgf / cm ² is applied to cause the ceramic particles 3 to penetrate the entire surface of the component 4. As a result, a component having a composite layer on the component surface is obtained. Further, by controlling the amount of the ceramic particles 3 in the pressing mold, it is possible to perform a plurality of processes on the component.

The above treatment may be performed in a vacuum or an inert gas atmosphere in order to prevent oxidation of the parts.

Next, as another method, as shown in FIG. 2, first, ceramic particles 3 are filled in a pressurizing outer cylinder (hereinafter, referred to as a capsule) 7 which receives pressurization, and then a metal or resin or the like is filled. Part 4 is embedded therein. The inside of the capsule 7 is depressurized and sealed. Thereafter, the temperature of each capsule is set to a predetermined temperature (1200 ° C. or lower) and 10 to 10,000.
Hydrostatic pressure of 00 kgf / cm ² (for example, CIP or HI
Push the ceramic particles to the component surface P) P ₂ is given from the outside of the capsule 7, to form a composite layer. Thus, a composite layer similar to the above-described method is obtained.

As shown in FIGS. 3 and 4, the surface layer of the composite material manufactured by the above-described method has a high-density composite portion formed by penetration of a composite material such as ceramic particles into the outermost layer. I have. The layer thickness t can be increased or decreased by changing the pressure P, the temperature Th during pressurization, or the time T during pressurization, or by combining the changed data. That is, as the constant pressing force T, the temperature Th at the time of pressurization Th
The layer thickness t can be increased by increasing the temperature, and can be decreased by decreasing the temperature. Similarly, the layer thickness t can be increased or decreased by keeping the temperature Th constant and increasing or decreasing the pressing force T.

[0017]

【Example】

1) SiC particles having an average particle diameter of 1 μm heated to 550 ° C. are placed in a pressure mold preheated to 300 ° C., and 55
A part made of JIS ADC12 Al alloy, which has been preheated to 0 ° C., is embedded and 1000 kgf / cm ² by the upper punch.
It was added hydrostatic pressure P ₁ 5 min. As a result, a composite component having a composite layer having a layer thickness of about 1000 μm on the surface as shown in FIG. 3 could be manufactured. In the figure, a is a composite layer, and b is an Al alloy as a base material.

2) Next, when the same SiC particles were heated to 450 ° C. and treated under exactly the same conditions as above, a composite having a composite layer having a layer thickness of about 10 μm on the surface as shown in FIG. Parts could be manufactured. In the figure, a is a composite layer, and b is an Al alloy as a base material.

According to the above embodiment, JIS ADC12A
Regarding the 1 alloy, it was confirmed that the thickness of the composite layer changed 100 times only by changing the heating temperature from 450 ° C. to 550 ° C. Therefore, when forming a composite layer with ceramic particles on the member surface by the method of the present invention, when the pressure is constant, the thickness of the composite layer can be controlled by adjusting the heating temperature. .
Similarly, when the temperature is kept constant, the thickness of the composite layer can be controlled by adjusting the pressing force.

Accordingly, a test piece was prepared for the material to be provided with the composite layer in advance, and a graph showing the change in the thickness of the composite layer according to the temperature change at a specific pressure was obtained. A composite layer having a desired thickness can be easily obtained in an actual production site by preparing a graph in which the change in the thickness of the composite layer is obtained in advance. The above is the case where the processing time is fixed, but similar results can be obtained by changing the processing time in the same manner. As described above, by appropriately considering each of the pressing force, the heating temperature, and the processing time to determine the relationship with the composite layer thickness, when forming the composite layer on the surface of a specific member, the specification A composite layer having a thickness corresponding to the thickness can be easily formed.

[0021]

According to the method of the present invention, when forming a composite layer with ceramic particles on the surface of an object to be processed, the composite layer having a required thickness according to the material of the object to be processed. Is easily obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a method of implementing a method according to the present invention.

FIG. 2 is an explanatory diagram of another embodiment of the method according to the present invention.

FIG. 3 is a diagram showing a metal structure in which a cross section near a composite layer of a member manufactured by the method according to FIG. 1 is enlarged.

FIG. 4 is a diagram showing a metal structure in which a cross section near a composite layer of a member manufactured under different conditions is enlarged from FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pressing type 2 Lower punch 3 Ceramic particle 4 Component 5 Upper punch 7 Capsule

────────────────────────────────────────────────── (5) References JP-A-1-272770 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C23C 24/08

Claims (2)

(57) [Claims] 1. A ceramic mold is accommodated in a pressurizing mold or a container, and an object to be processed is embedded in the ceramic particles.
When pressure is applied from the direction to form a composite layer with ceramic particles on the entire surface of the object to be treated, the thickness of the composite layer to be formed is determined by applying the pressure, the heating temperature, and the pressurization time. A method for controlling a composite layer thickness of a composite member, wherein the control is performed by a combination. 2. A combination of the pressing force, the heating temperature, and the pressing time corresponding to the thickness of the composite layer is determined in advance for each base material to be processed, and thereby the object to be processed is determined. 2. The method for controlling the thickness of a composite layer according to claim 1, wherein a composite layer having a thickness required in step (a) is formed.