JPH1157878A - Manufacturing method for molding product of ceramic fiber reinforced metal base compound material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the heat molding and prevent the deterioration of the ceramic fiber due to the reaction against the air by vacuum filling the ceramic fiber reinforced metal base compound material into the coating material with a high workability and by plastic processing it. SOLUTION: When the molding product is made of a flat plate compound material comprising the ceramic fiber such as silicon carbide, alumina and the like, and the metallic foil such as aluminum, titanium and the like, the flat plate compound material is coated with the metal plate having the Plastic workability same as or higher than that of the matrix metal; for example, SP700 alloy, SUS304 and the like. Then, after the flat plate compound material is vacuum filled and heat-molded into a desired shape together with the coating material, the coating material is removed. Further, the molding can be any method of pressing, HIP, gas pressing and the like. Since the compound material is fixed to the inside with the coating material, the desired shape can be stably provided without changing the position from the die during molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a metal-based composite material molded article, and more particularly to a method for producing a so-called ceramic fiber-reinforced metal-based composite material molded article in which various metal matrices are reinforced with ceramic fibers.

[0002]

2. Description of the Related Art Ceramic fiber-reinforced metal-based composite materials (hereinafter referred to as FRMs) in which various matrix metals and ceramic fibers are combined have excellent performances in terms of strength, rigidity, heat resistance, etc. and have attracted attention in various fields. Is the material that is being used. A wide variety of FRMs are known, and their production methods are also diverse. For example, a method of laminating a sheet metal and a ceramic fiber alternately to form a composite by diffusion bonding, a method of using a fiber coated with a matrix metal on the surface of the ceramic fiber, a method of bundling this and forming a composite by diffusion bonding, and a method of forming the ceramic fiber. There is a method of winding around a drum or the like, and bonding a matrix metal thereon by a method such as thermal spraying to form a composite.

[0003] When a FRM molded article is manufactured by plastically processing the FRM manufactured by these methods,
The method as shown in FIG. 5 has been adopted. That is, FIG.
As shown in (a), the F obtained by the method as described above is used.
Method of manufacturing the FRM molded product 5 by directly setting the RM flat plate 4 between the upper and lower molds 7 and 8 and molding by applying pressure, FIG.
As shown in (b), the FRM flat plate 4 is set at a predetermined position of the mold 9, the top plate is covered with an auxiliary plate 10, and the periphery of the auxiliary plate 10 and the mold 9 are welded or the like. Flat plate 4
After vacuum sealing, the auxiliary plate 10 and the internal FRM flat plate 4 are formed by applying heat and pressure by HIP processing to obtain a FRM molded product 5 and, as shown in FIG.
The FRM flat plate 4 is molded together with the dummy sheet 12 by setting the FRM flat plate 4 in 1, sandwiching only the dummy sheet 12 placed thereon with the mold 11 from above and below, and applying gas pressure to the dummy sheet 12. There is a method for obtaining the FRM molded product 5.

[0004]

As described above, in the case of performing plastic working by directly contacting the FRM with a mold in the production of an FRM molded product, there are the following problems. The first is that the ceramic fibers protruding at the end of the FRM are
In the case of hot plastic working, it reacts with the atmosphere during the molding to cause deterioration, and the characteristics of the molded product are significantly reduced.
Secondly, since the FRM is placed on the lower mold surface having a curved surface in an unstable manner and molding is performed, the FRM easily moves during molding and positioning is difficult, and the shape accuracy of the FRM molded product is difficult. Is bad.

An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a method of manufacturing a FRM molded product capable of obtaining a stable high-quality FRM molded product with a simple apparatus and operation. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, a ceramic fiber reinforced metal-based composite material is vacuum-sealed in a coating material having a plastic workability equal to or better than that of the composite material, and the composite material is coated with the coating material. And a plastic working with a ceramic fiber reinforced metal-based composite material.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A method of manufacturing an FRM molded product according to the present invention comprises a metal sheet material such as a metal foil or a sheet obtained by sintering a metal powder into a thin sheet, and a ceramic fiber processed into a long fiber, mesh or woven form. This is effective in the case of a manufacturing method in which fibers are laminated, sintered and composited. Examples of metals used as the matrix component in the method of the present invention include metals and alloys such as titanium, aluminum, titanium alloys, aluminum alloys and nickel alloys, and intermetallic compounds such as titanium aluminum and nickel aluminum. Further, as the ceramic fiber, silicon carbide fiber, alumina fiber, carbon fiber, boron fiber, titanium diboride fiber and the like can be used. Among them, titanium alloys (Ti-6Al-4V, Ti-6Al-2S) exhibiting superplastic properties as a metal
Preferably, ceramic fibers such as silicon carbide fiber or alumina fiber are used in combination, such as n-4Zr-2Mo) or a titanium aluminum intermetallic compound (Ti-25Al-10Nb-3V-1Mo, etc.).
As the coating material, a material having the same or higher plastic workability than the matrix metal of the composite material, for example, Ti-15
V-3Al-3Cr-3Sn alloy, Ti-4.5Al-
3V-2Fe-2Mo alloy (SP700 alloy), austenitic stainless steel (SUS304, 316) or the like is used.

(Action) In the method of the present invention, the FRM
Is subjected to plastic working by vacuum encapsulation, so that in the case of hot forming, it is possible to prevent the FRM, which is a material, from reacting with the atmosphere and deteriorating. Also, in the molding using gas pressure, as shown in FIGS. 5B and 5C, the FRM is not molded in a state where the FRM is placed on the lower mold in an unstable manner. As shown in (b) and (c), FR
Since the M plate is sealed in vacuum and fixed by the covering material used for sealing, the positional relationship with the mold does not change significantly during molding (the FRM rotates during molding, etc.). (It does not shift.) It is possible to stably obtain a desired molded product shape.

[0009]

EXAMPLES Hereinafter, specific examples of the present invention will be described to clarify the effects of the present invention. FIG. 1 shows a basic manufacturing process of an FRM molded article of the present invention.
A ceramic fiber 1 such as iC) or alumina (Al ₂ O ₃ ) and a metal foil 2 such as aluminum, titanium or a titanium alloy are laminated and HIP or HP (hot press)
To produce a composite material flat plate 4. Next, this flat FRM is coated with a coated metal plate 7 (for example, Ti-15V-
3Al-3Cr-3Sn alloy, Ti-4.5Al-3V
-2Fe-2Mo alloy (SP700 alloy), austenitic stainless steel (SUS304, 316), etc. Surrounded by｝, sealed by welding, etc., then the inside air is removed by a vacuum pump, and the air outlet is welded, etc. Vacuum sealing is performed by closing with. Then, the vacuum-filled FRM is shaped by plastic working using a mold 6 to obtain a composite material molded product (5) of the present invention.

As a means for plastic working, a method shown in FIG. 2 is typical.

(1) Hot pressing method This method is also used for ordinary sheet metal forming.
As shown in the figure, a vacuum-enclosed FRM flat plate 4 to be provided with a shape is sandwiched between upper and lower molds 7 and 8 and press-molded under appropriate conditions. It is referred to as molded article 5. The forming conditions mainly depend on the properties of the metal constituting the matrix and the coated metal, but the strain rate is 1 × 10 ⁻³ to 1 × 10 ⁻⁵ at a temperature of 700 ° C. or more for titanium alloy and 400 ° C. for aluminum alloy. / Sec. Especially Ti-6Al-4V and 747
When a material having superplastic properties such as a 5Al alloy is used as a matrix, the degree of working can be increased by performing the working under the conditions indicated by each material, and the quality of the obtained product is good.

(2) HIPing Method A set of a FRM flat plate 4 vacuum-sealed inside a capsule having a structure composed of a mold 9 and an auxiliary plate 10 as shown in FIG. 2B (FRM vacuum-sealed in a mold) This is a method in which the end of the flat plate 4 is fixed) and heat and pressure are applied by HIP to form.
In the case of this molding method, after the temperature reaches the temperature described in the above (1), pressure molding is performed, and the pressure applied before reaching this temperature is as low as the HIP device allows. In addition, it is desirable to control the pressing speed so that the strain rate of the flat plate to be formed is substantially the same as the speed described in the above (1). This method is the same as the conventional method in that the HIP is used, but has an advantage that the positional relationship with the mold can be prevented by fixing the vacuum-sealed FRM flat plate 4 to the mold.

(3) Method by gas pressure molding During hot pressing, the mold 11 as shown in FIG. 2C is set, and the FRM flat plate 4 is vacuum-sealed by gas pressure.
｛SiC / Ti alloy SP700 (Ti-4.5Al-3
V-2Fe-2Mo)} together with the upper and lower coating materials (Ti alloy SP700 plate) used for the upper and lower vacuum sealing. The molding conditions are the same as in the above (1), and the strain rate at the time of molding is adjusted by the manner of applying the gas pressure.

FIG. 3 shows an example of a molded product manufactured by these methods. FIG. 3A shows a molded product having a double curved surface like a blade surface, and FIG. 3B shows a molded product in a stringer shape having three corner portions. Here, as a reinforcing material, a SiC long fiber (SCS- manufactured by Texlrou, USA) is used.
6), the bending direction with respect to the direction of the fiber varies. In addition to this, it is also possible to form a laminate or a woven fabric in which several layers and layers arranged in different directions from the fibers are laminated.

FIG. 4 shows an FRM (SiC / Ti alloy SP700) molded product manufactured by the method of the present invention.
The tensile strength of｝ having the same shape as (b) is shown in comparison with the flat FRM (SiC / Ti alloy SP700) before molding. The tensile strength of the molded product is the flat FRM (Si
(C / Ti alloy SP700), and it is confirmed that there is no deterioration in characteristics even after plastic working.

[0016]

According to the method of the present invention, a metal-based composite material reinforced with ceramic fibers can be formed and shaped by a simple process without impairing its material properties, and a high-quality molded product can be obtained. Can be obtained stably. Performing the shape imparting to the FRM by plastic working in this manner has not been conventionally performed, and it is industrially very valuable that a high quality molded product can be manufactured by the method of the present invention. it is conceivable that.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a basic manufacturing process of an FRM molded product of the present invention.

FIG. 2 is a schematic explanatory view showing an example of a shape imparting means by plastic working of the present invention.

FIG. 3 is an external view of a molded product manufactured by the method of the present invention.

FIG. 4 is a table showing the tensile strength of a molded article manufactured by the method of the present invention.

FIG. 5 is a schematic explanatory view showing an example of a shape applying means by plastically processing an FRM by a conventional method.

Claims (1)

[Claims] 1. A ceramic fiber-reinforced metal-based composite material,
A method for producing a molded article of a ceramic fiber reinforced metal-based composite material, comprising vacuum-encapsulating in a coating material having the same or better plastic workability than that of the composite material and plastically processing the composite material together with the coating material. .