JP2520548Y2 - Reinforcement molding for metal-based composite material manufacturing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a metal-based composite material member, that is, a member made of a composite material or a metal member having a composite material portion, and more specifically to a metal-based composite material member. The present invention relates to a reinforcing material molded body used in the manufacture of

[Prior Art] As one of the methods for producing a metal-based composite material member, a porous molded body made of a reinforcing material is formed, the molded body is placed in a mold, and a molten metal of a matrix metal is poured into the mold. However, the pressure casting method in which a molten metal of a matrix metal is infiltrated into a molded body is well known, and has been widely used for manufacturing composite material members.

In addition, Japanese Patent Application No. 1 related to the application of the same applicant as the applicant of the present application
As described in JP-A-282250, as one of the melt infiltration methods, a substance such as Ti that reacts when heated by a molten metal of a matrix metal to reduce the pressure inside the molded body (hereinafter referred to as a pressure reducing substance) ) Has been proposed, a method of forming a porous reinforcing material molded body containing the above), contacting the reinforcing material molded body with the molten metal of the matrix metal, and allowing the molten metal to permeate into the molded body without substantially applying pressure.

[Problems to be Solved by the Invention] However, when a metal-based composite material member having a concave portion on the surface of the composite material portion is manufactured by the pressure casting method as described above, it substantially corresponds to the concave portion to be formed. Even if a reinforcing material having a concave portion is used, since the molten metal of the matrix metal solidifies in a state of being filled in the concave portion, the matrix metal in the concave portion of the original molded body is removed by cutting or the like after the completion of casting, After that, the concave portion must be finished, so that the metal matrix composite material member cannot be efficiently and inexpensively manufactured.

In view of the above-mentioned problems in the case of manufacturing a metal-based composite material member having a concave portion on the surface of the composite material portion by a pressure casting method or the like, the present invention provides the above-mentioned Japanese Patent Application No. 1-282250. The proposed method, that is, forming a porous reinforcement molding containing a pressure reducing substance that reacts when heated by a molten matrix metal to reduce the pressure inside the molding, By applying the method of bringing the molten metal into contact with the molten metal and allowing the molten metal to penetrate into the molded body without substantially pressurizing the molten metal, it is possible to efficiently and inexpensively manufacture a metal-based composite material member having a concave portion on the surface of the composite material portion. The aim is to provide a reinforcement molding which makes it possible.

[Means for Solving the Problems] According to the present invention, the above-described object is to provide a reinforcing material molded body used in the manufacture of a metal-based composite material member having a concave portion on the surface of the composite material portion, and to provide a reinforcing material. And a matrix having a porous structure containing a substance that reacts when heated by a molten metal of the matrix metal to reduce the pressure inside the molded body, and has a recess substantially corresponding to the recess to be formed. A substance having poor wettability with respect to the molten metal and being substantially stable even in the molten metal of the matrix metal is achieved by the reinforcing material compact filled in the recess.

[Advantage of the Invention] According to the above configuration, when the molded body is placed in the mold, the molten matrix metal is poured into the mold, and the molded body is heated by the molten matrix metal, the pressure reducing substance React with each other (adsorption of nitrogen and oxygen in the air inside the molded body) to reduce the pressure inside the molded body, which creates a differential pressure inside and outside the molded body, so that the molten metal of the matrix metal does not have to be pressurized. Penetrates well into the compact, which forms a composite material. In addition, the wettability of the matrix metal to the molten metal and the substance that is substantially stable even in the molten matrix metal (hereinafter referred to as impregnation-inhibiting substance) prevent the concave portion of the molded body from being filled with the molten matrix metal. Therefore, the recess is formed on the surface of the composite material portion only by removing the impregnation-inhibiting substance after casting,
Further, in this case, since the matrix metal is not impregnated into the recess of the molded body, the impregnation-inhibiting substance can be easily removed from the recess after casting. Therefore, it becomes possible to efficiently and inexpensively manufacture a metal-based composite material member having a recess on the surface of the composite material portion.

In the present invention, the pressure reducing substance that reacts when heated by the molten metal of the matrix metal to reduce the pressure inside the molded body is limited to Ti and Al described in the above-mentioned Japanese Patent Application No. 1-282250. However, for example, Ti, Zr, Zr and
It may be a combination of Al, a combination of Ti and Zr and Al, and the like. Further, in order that the reaction of these substances is carried out favorably, for example, when the matrix metal is an aluminum alloy, it reacts with Al powder or Al alloy powder mixed in the matrix metal or the molded body, such as Ni and Cu. It is preferable that the molded body contains a substance that generates heat.

Further, the impregnation-inhibiting substance used in the present invention may be any substance as long as it has poor wettability to the molten metal of the matrix metal and is substantially stable in the molten metal of the matrix metal. Short fibers such as alumina-silica fibers, glass fibers, mineral fibers, carbon fibers, whiskers such as potassium titanate whiskers, silicon carbide whiskers, silicon nitride whiskers, alumina, silica, mullite,
A powder such as silicon carbide or silicon nitride is preferable.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Example 1 Al powder having an average particle size of 30 μm (manufactured by Showa Denko KK, JIS
Standard AC8A), Ni powder with an average particle size of 3 μm (Type 255 manufactured by INCO), Ti powder with an average particle size of 20 μm (Osaka Titanium Co., Ltd.), and SiC with an average particle size of 5 μm as a reinforcing material.
Powder (manufactured by Showa Denko KK) was weighed and mixed at a volume ratio of 13: 1: 1: 1. Then, the obtained mixed powder is compression-molded by a compression molding device at a surface pressure of about 4 ton / cm ² to obtain Al powder 10 and Ni powder 12 as shown in FIG.
Consisting of Ti powder 14 and SiC powder 16, outer diameter 90 mm, inner diameter 75 m
A ring-shaped porous molded body having a size of m and a height of 7 mm, a groove 18 having a depth of 5 mm and extending in the circumferential direction in the center of a cylindrical outer peripheral surface, and having a porosity of 20%. Twenty formed.

Then, as shown in FIG. 2, an alumina-silica fiber 21 having an average fiber diameter of 3 μm and an average fiber length of 1.5 mm is provided in the groove 18.
(Isolite Industry Co., Ltd. "Alcylon") was filled at a volume ratio of 2%.

Next, as shown in FIG. 3, a casting apparatus 26 for manufacturing a piston, which comprises an upper die 22 and a lower die 24, is prepared, and a molded body is prepared.
The outer peripheral portion of 20 is placed between the upper half portion 24a and the lower half portion 24b of the lower mold, the molded body is placed at a predetermined position in the lower mold,
Molten metal 28 of 710 ° C aluminum alloy (JIS standard AC8A) was poured into the lower mold and solidified without pressurizing the molten metal. Thus, a total of 10 piston rough materials are formed, 5 of which are
Examination of the cross-section of the composite material part after cutting and polishing each piece of rough material revealed that aluminum alloy was infiltrating well between the SiC powders in all of the rough materials, and casting defects such as poor filling were found. Did not occur at all.

Further, the aluminum alloy on the surface of the remaining five piston rough materials was removed, and the alumina-silica fibers were removed from the recesses of the original molded body by scraping with a wire,
The alumina-silica fiber was easily dropped from the recess, and the piston ring groove could be formed only by finishing.

Example 2 Volume ratio of Al powder, Ni powder, Ti powder and SiC powder is 65: 5: 7:
Example 3 except that potassium titanate whiskers having a porosity of 20% and an average fiber diameter of 0.3 μm and an average fiber length of 17 μm were used as an impregnation-inhibiting substance at a volume ratio of 8%. A rough piston material was formed under the same procedure and conditions as in the above case.

As a result, the potassium titanate whiskers could be easily removed from the recesses of the original molded body by scraping with a wire, and the piston ring groove could be formed only by finishing. Further, the aluminum alloy was satisfactorily permeated between the SiC powders, and casting defects such as poor filling did not occur at all.

In the above, the present invention has been described in detail with respect to two embodiments, but the present invention is not limited to these embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[Effect of the invention] As is clear from the above description, according to the invention,
When the molded body is placed in the mold, the molten matrix metal is poured into the mold, and the molded body is heated by the molten matrix metal, a pressure reducing substance such as Ti reacts to reduce the pressure inside the molded body. However, since the molten metal penetrates well into the molded body without pressurizing the molten metal of the matrix metal by creating the differential pressure inside and outside the molded body, it is possible to manufacture a good composite material member without impregnation failure. . Further, since the impregnation-inhibiting substance prevents the concave portion of the molded body from being filled with the molten metal of the matrix metal, it is possible to form the concave portion on the surface of the composite material portion only by removing the impregnation-inhibiting substance after casting. In this case, since the matrix metal is not impregnated into the recess of the molded body, the impregnation-inhibiting substance can be easily removed from the recess after casting. Therefore, the metal-based composite material member having the concave portion on the surface of the composite material portion can be efficiently manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing a porous reinforcing material molded body having a groove extending in the circumferential direction at the center of a cylindrical outer peripheral surface by cutting a part thereof, and FIG. 2 is shown in FIG. FIG. 2 is a perspective view showing an embodiment of a reinforcing material molding according to the present invention in which a groove of the reinforcing material molding is filled with an impregnation-preventing substance, and FIG. It is sectional drawing which shows the casting process performed using a reinforcement material molded object. 10… Al powder, 12… Ni powder, 14… Ti powder, 16… SiC powder, 18…
Grooves, 20 ... Reinforcement molding, 21 ... Alumina-silica fiber, 22 ...
Upper mold, 24… Lower mold, 26… Casting equipment, 28… Molten aluminum alloy

Claims (1)

(57) [Scope of utility model registration request] 1. A reinforcing material molded body used for manufacturing a metal-based composite material member having a recess on the surface of a composite material portion, which reacts when heated by a molten metal of the reinforcing material and a matrix metal, and the inside of the molded body. In the molten metal of the matrix metal, which has a porous structure containing a substance for reducing the pressure of, has a concave portion substantially corresponding to the concave portion to be formed, and has poor wettability with the molten metal of the matrix metal. Even if the material is substantially stable, the reinforcing material molded body is filled in the recess.