JPH02251353A - High temperature pressurizing forming method for metal base composite material - Google Patents

Abstract

PURPOSE:To form a metal base composite material under a low pressurizing force by charging an alloy ingot adding particles, whiskers, etc., to a low m.p. light metal into a metallic mold and pressurizing-forming this after heating heater at a higher temp. than the m.p. CONSTITUTION:The alloy ingot 11 adding particles, whiskers etc., of SiC, Si3N4, etc., to the low m.p. light metal of Al, Mg, etc., is charged into the metallic mold 10 and heated to higher temp. than the m.p. with an electric heater 13. As matrix in the metal base composite material and SiC, etc., are wet, the condition before heating is almost held as it is. Then, at the time of applying the pressurized force to the ingot 11 with a pressurizing punch 14, this is easily deformed to form this into mold after the form of the metallic mold 10. The pressurization is continued until the forming product comes to lower temp. than the solidified point. The metal base composite material can be formed into the desired forming product with the low pressurizing force and the service life of the metallic mold 10 is prolonged.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to a high-temperature pressing method for metal matrix composite materials.

(Problems to be solved by conventional techniques and inventions) Recently,
Metal matrix composite materials are being developed for the purpose of increasing the specific strength and specific rigidity of products. Molding methods for this type of metal matrix composite include a sintering method in which alloy powder and ceramics are mixed, the mixture is placed in a mold, compacted, and sintered under pressure using a hot press, etc.; The body is made into a product shape, this is placed in a mold, and then the molten alloy is poured into the mold and a pressure punch is used to impregnate the molded body with the alloy.The pressure casting method is used to make the composite into an ingot, which is then forged into a product. There is a pressure forging method in which the shape is approximated and then the shape is cut.

However, although the sintering method is easy to mold into a product of a desired shape, it involves turning the metal into powder with small particle size, which is then subjected to several processes such as compaction, pressure sintering, etc. This has the disadvantage of increasing the price of the product. In addition, the pressure casting method shapes the ceramic into a product shape and applies a large pressure inside the mold, which requires a large pressurizing device and makes it difficult to manufacture products with complex shapes. There are drawbacks. Furthermore, the pressure forging method has drawbacks such as the need to cut a hard composite material into a shape close to that of a product and then cutting it, which requires a tool such as a carbide bit.

The present invention is a method of forming a metal matrix composite material in order to solve these problems.

[Structure of the invention]

(Means for Solving the Problems) The present invention involves placing an ingot of an alloy in which additives such as particles and whiskers are added to a low-melting light metal into a mold, heating the ingot to a high temperature higher than the melting point, and then processing the ingot. It is designed to be press-formed.

(for production) For example, Sic for low melting point light metals such as AI and Mg.

Si3N4. An alloy ingot containing particles such as KiO6Ti02 and additives such as whiskers is placed in a mold.
This ingot is heated in a mold to a high temperature above its melting point,
When this heated ingot is pressed with a pressure punch, the alloy is easily deformed and molded into a shape that corresponds to the mold.

(Example) An example of the method for molding the metal matrix composite material of the present invention will be described below with reference to the drawings.

In the drawings, reference numeral 10 indicates a mold, and the mold 1
The inner surface 12 of the mold 10 has a shape corresponding to the outer shape to be molded, and the ingot 1 is placed on the outer periphery of the mold 10.
An electric heater 13 is installed to raise the temperature of 1 above the complete melting point. An ingot 11 is placed in the upper part of this mold 10.
A pressure punch 14 is provided for pressure-forming the inner surface 12.

For example, a low melting point light metal such as AI or Mg is used as a matrix metal, and Sic, Si3N4. An ingot 11 of a simple fiber-reinforced metal matrix composite material made of an alloy containing particles such as KiO.6Ti02 and additives such as whiskers is placed in a mold 10, and an electric heater 13 is used to lower the melting point (liquidus line). temperature) or higher. In this state, the state before metal matrix composite heating is almost maintained. Here, the ingot 11 is pressed with a pressure punch 14 of 5 to 100 kgf/c.
When a pressure of j is applied, the ingot 11 is easily deformed in the mold 10 by the pressure applied by the pressure punch 14, and is molded into a shape corresponding to the mold in the mold 10. This pressurization is continued until the temperature is below the melting point (solidus temperature) at which the molded article solidifies.

This allows the ingot 11 to be easily molded into a desired molded product.

〔Effect of the invention〕

In the present invention as described above, the metal matrix composite material is formed into an ingot shape, and this is heated in a mold to a temperature higher than the complete melting point and then pressure molded. Materials can be formed into desired molded products. Moreover, as mentioned above, since the molding is performed by heating to a temperature above the melting point, the amount of deformation can be large, there is almost no restriction by the shape of the molded product, no preforming is required, and the pressing force is small. Therefore, the pressurizing device does not become large and the life of the mold etc. can be extended.

Inner surface of mold, 13... electric heater, 14... pressure punch.

Claims (1)

[Claims] A metal characterized by placing an ingot of an alloy in which additives such as particles and whiskers are added to a low-melting point light metal into a mold, heating the ingot to a high temperature above the melting point, and then press-forming the ingot. High-temperature pressing method for base composite materials.