JPH038551A - Wear resistant aluminum complex material - Google Patents

Abstract

PURPOSE:To improve wear resistance and to firmly join a formed body and aluminum by preheating the formed body composed of metal foil, filling up the aluminum into gap in the formed body with pressurized casting and generating intermetallic compound layer at interface between the formed body and the aluminum. CONSTITUTION:The formed body 6 is one inserting copper foil corrugate plate 2 between the plural copper flat plates 1. Successively, this corrugate formed body 1 is preheated under inert gas atmosphere and charged into cavity 8 in a pressurized casting complexing device 10, and molten aluminum or aluminum alloy 7 is poured and solidified under pressurizing with a pressurizing punch 3 and complexed to generate the intermetallic compound layer at the interface between the formed body 6 and the aluminum or aluminum alloy. By this method, the wear resistance is improved with the intermetallic compound layer having high hardness and the joining of the formed body 6 with the aluminum or aluminum alloy is made to firm.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a composite material made of aluminum or an aluminum alloy with improved wear resistance.

(Prior art) Conventional wear-resistant aluminum composite materials include Japanese Patent Application Laid-Open No. 59-218341 and Japanese Patent Application Laid-Open No. 61-163249.
There is something disclosed in the publication.

In other words, the former (Japanese Unexamined Patent Publication No. 59-218341 Disclosed technology) uses a porous metal body, fills the aluminum alloy again into the porous metal body, and forms a compound (intermetallic compound) of the metal and aluminum of the porous metal body at the boundary between the porous metal body and the aluminum alloy.
fJ) layer.

The latter (the technique disclosed in JP-A-61-163249) involves placing metal powder in a mold, pouring molten metal such as aluminum alloy under pressure, and further heat-treating it, or mixing powder with the molten metal in advance. , solidified and heat treated to produce a composite material.

(Problems to be Solved by the Invention) However, in such conventional examples, the metal porous body used in the former is generally called a metal foam, which is a three-dimensional network consisting of an organic material, etc. It is manufactured by attaching metal, for example, by plating, to the surrounding area and decomposing or dissolving and eliminating the organic matter.

Therefore, the production of this metal porous body requires multiple steps such as the organic substance network manufacturing process, plating process, organic substance degreasing process, etc., and in order to withstand the high pressure during composite casting, the metal porous body must also be This process requires a lot of man-hours, and there are intermediates that are not included in the final product and are removed during the process, which is disadvantageous both technically and in terms of cost. Therefore, there is a problem that the resulting composite material becomes expensive.

In the latter case, since powder is used, it is difficult to compositely strengthen only a portion of the piston ring groove, for example, because it is difficult to retain the powder in that area. . Furthermore, mixing and dispersing the metal powder in the molten aluminum alloy in advance has the disadvantage that the difference in specific gravity between the molten aluminum alloy and the metal powder makes uniform dispersion difficult.

The present invention has been made in view of these conventional problems, and its purpose is to improve the wear resistance due to the intermetallic compound layer having high hardness, and to improve the wear resistance between the molded body and aluminum. Another object of the present invention is to provide a wear-resistant aluminum composite material that has a strong bond with an aluminum alloy, is simple in terms of materials and processes, and is advantageous in terms of cost.

(Means for solving the problems) In order to achieve the above object, the present invention preheats this molded body in an inert gas atmosphere and injects aluminum into the gap between the molded bodies made of metal foil.

Alternatively, an aluminum alloy was filled and composited by pressure casting, and an intermetallic compound layer was generated at the interface between the molded body and aluminum or aluminum alloy.

(Function) A highly hard intermetallic compound is created by filling the gap between a molded body made of metal foil with aluminum or an aluminum alloy and forming an intermetallic compound layer at the interface between the molded body and aluminum or aluminum alloy. As a result, wear resistance was improved, and the molded body and aluminum or aluminum alloy were firmly bonded.

(Description of Examples) Example 1 A corrugated molded body 6 shown in FIG. 1 was created using silver foil with a nominal thickness of 50 μm.

This corrugated molded body 6 is formed by interposing a copper foil corrugated plate 2 between a plurality of silver foil flat plates 1.

This corrugated molded body 6 was held at 430° in a nitrogen gas atmosphere.
Preheated to C. Then, the corrugated molded body 6 is inserted into the cavity S preheated to 250°C of the pressure casting composite equipment 10 shown in FIG. The composite material 11 was prepared by pouring the molten metal and solidifying it under a pressure of 750 kg-f/aJ by operating the pressure punch 3.

In addition, in the pressure casting composite apparatus 10 shown in FIG.
5 is the side type, and 5 is the bottom type.

FIG. 4 shows an electron micrograph of the metallographic structure of the composite material 11 obtained in this way. 9 is occurring.

A chip is made from the composite material 11, and the chip-on-chip
As a result of comparing the amount of wear with an AC8A tip using a disk wear tester using a cast iron disk for a piston ring as a mating material, it was found that the amount of wear was reduced by 40%, and the wear resistance of Composite Material 11 was improved.

Further, after casting, the composite material 11 was heat treated at 500°C for 8 hours, and the amount of wear was reduced by 47%.

However, when the corcate molded body 6 was preheated in an air atmosphere, some peeling occurred at the interface with the aluminum alloy part 7', and little intermetallic compound 9 was formed.

Example 2 A honeycomb molded body was made from nickel foil with a nominal thickness of 30 μm, pressure cast as in Example 1, and heat treated at 500° C. for 8 hours. When the obtained composite material was evaluated as in the example, the wear amount was 50% compared to the AC8A tip.
%Diminished.

(Effects of the Invention) As described above, according to the present invention, aluminum or aluminum alloy is added to the gap between the molded body made of metal foil while preheating the molded body in an inert gas atmosphere. By pressure casting, it is filled and composited, and the molded body and 1
Since an intermetallic compound layer is generated at the interface between aluminum or aluminum Δ and gold, the hardness of the intermetallic layer improves abrasion resistance, and the molded body and aluminum A
, or the bond with aluminum alloy becomes stronger.

In addition, the molded body has a simple structure in which metal foil is molded into, for example, a corrugated L- or honeycomb-11 shape, and aluminum,
Alternatively, when aluminum alloy and pressure-cast composite are heated, preheating is performed in an inert gas atmosphere. Therefore, it is simple in terms of materials and process, and is advantageous in terms of loss.

[Brief explanation of drawings]

Fig. 1 is a front view of a Korgu 1 molded body made of copper foil, Fig. 2 is a plan view of the same, Fig. 3 is an explanatory diagram of the configuration of a pressure casting composite device, and Fig. 4 is a durable It is a micrograph of the electron head on the metal assembly of the abrasion/i aluminum composite material. 1... Copper foil flat plate, 2... Copper foil corrugated plate, 6...
...Korgu 1-molded body, 7'...aluminum alloy part, 9...intermetallic compound layer, 10...pressure casting composite device, 11...composite material.

Claims (1)

[Claims] The molded body made of metal foil is preheated in an inert gas atmosphere, and aluminum or aluminum alloy is filled into the gap by pressure casting to form a composite, thereby forming an interface between the molded body and the aluminum or aluminum alloy. A wear-resistant aluminum composite material characterized by having an intermetallic compound layer formed thereon.