JPS62227049A - Manufacture of metal-base composite material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a metal matrix composite material (hereinafter referred to as "FRMJ") in which reinforcing fibers are integrally bonded to a metal matrix, which is used as, for example, golf shafts, aircraft housings, etc. Regarding the manufacturing method.

Conventional technology and its problems FRM is a composite material of high-strength fibers and metal materials. By combining materials with different characteristics, we derive the excellent characteristics of each material and compensate for their shortcomings, resulting in dramatically improved functionality. It means the material that has. The manufacturing methods for FRM that exhibit such excellent properties are: ■Liquid phase method;■
It is broadly divided into the solid phase method and the unidirectional solidification method.
ζThe issues are: ■ Wettability of the fiber and matrix, ■
These include the compatibility of the fibers and the matrix, and the presence of pores between the fibers and the matrix. Regarding the wettability (2), it is generally improved by subjecting the fibers to various surface treatments (Metals Research Bulletin 23 (1984) 396).

■Compatibility means that when high-temperature molten metal comes into contact with the fibers that make up FRM-\il-, a reaction occurs between the two, and ram
It is known that the higher the temperature, the more the temperature deteriorates (CCM-■ (1982) 12
73.1315). Therefore, in the above-mentioned liquid phase method (1), there is a problem in that the temperature is extremely high, resulting in a decrease in the strength of the fibers. On the other hand, (2) the solid phase method uses a lower temperature than the liquid phase method, so the problem of fiber strength reduction is alleviated, but generally sufficient strength cannot be obtained unless the treatment is carried out at high temperature and high pressure for a long time. In addition, it has the disadvantage of high consumable costs and poor productivity.

Purpose of the Invention The present invention was made to solve the above-mentioned problems of the prior art, and it is possible to produce a high-strength FRM with excellent compatibility between the matrix and fibers in a short period of time at low temperatures. The purpose is to propose a method.

Structure of the Invention The method for producing an FRM according to the present invention uses a kl-Mg alloy as a matrix, and when integrally molding this matrix, reinforcing fibers, and a material, the eutectic point (
450° C. and 437° C.) and the melting point.

That is, this invention uses an A/-Mg alloy having eutectic points at 450°C and 437°C as a metal matrix, and maintains the temperature between the eutectic point and the melting point to melt a part of the matrix and form an integral part. This is a method of Therefore, although it is essentially a liquid phase method, it is apparently a single stroke molding method that is similar to the same phase method.

In this invention, the eutectic point is the temperature at which crystals of aluminum and magnesium appear simultaneously, and as shown in Figure 1, which shows a phase diagram at which eutectic formation of All and Mg occurs, the melting point of pure HL is 660°C. , has a eutectic point at 450'C and 437°C, which is about 200°C lower than the melting point of pure Mg, 649°C.

Further, the form of the A$-Mg alloy may be either foil or powder, and the alloy components have a liquid phase volume ratio of 17 to 5 at the forming temperature.
Optimize the composition that gives 0 shadow.

Further, typical reinforcing fibers used in the present invention include poron fibers, carbon fibers, silicon carbide fibers, and alumina fibers. Among these, poron fibers are most commonly used as reinforcing fibers for FRM.

FIG. 2 is a perspective view showing an example of the laminated structure of FRM manufactured by the method of the present invention, in which (1) is an aluminum plate rolled into a thin plate.
-Mg alloy Mado IJx, (2) indicates reinforcing fibers oriented in one direction. This FRM consists of an Al-Mg alloy matrix (1) rolled into a thin plate.
By arranging the reinforcing fibers (2) in one direction on the top, and after laminating them, they are held at a temperature between the eutectic point and the melting point of the Al-Mg alloy, and are pressed together with a press to form an integral mold. Obtainable. Therefore, the method of this invention does not require a high-temperature, high-pressure generator unlike the solid-phase method, and the holding temperature during molding is low and the entire matrix does not melt, so the material can basically be handled as a solid. It is possible.

Example An Ae-Mg alloy with a weight ratio of A175:Mg25 was used as the matrix, and reinforcing fibers with a diameter of 100 μm were used.
The Ae-Mg alloy is rolled into a thin plate with a thickness of 0.1fl using Poron fibers of 150mm, and from this thin plate 150fi length x
Prepare 80 small pieces cut out with a width of 25n, the poron fibers are oriented in one direction between each small piece, and the assembled product is fired at a temperature of 300 to 500°C, 100 atm, and held for 10 minutes, After firing, a flat plate tensile test piece of 150jfl length x 15ff width was collected by machining, and ASTM D
A tensile test was conducted according to 3552. At the same time, after molding, the fibers were extracted and the compatibility was investigated, and the results are shown in Figure 3.

From FIG. 3, it can be seen that the strength of FRM is almost the same as Al alone when fired at 400°C or lower, and becomes about twice that of A[ when fired at 465°C and 500°C. this is,? Portrait 1
As is clear from the phase diagram shown in the figure, β in the matrix
This corresponds to the phase melting at 450°C. B/kl FRM (50% in Vf) prepared by normal liquid phase method is
The increase in strength is 1.4 times that of AJ alone, and the strength of the FRM produced by the method of this invention is excellent.

On the other hand, the strength of the extracted filament after firing is 300~
It can be seen that over 90% of the original filament strength was maintained in the firing temperature range of 500°C, and there was almost no deterioration. Compared to the filament produced by the liquid phase method, which shows a significant deterioration of 0.3, the effects of this invention are clear.

FIG. 4 shows the relationship between FRM strength and Mg weight %. Here, when Mg=10%, the liquid phase at the firing temperature is 0%, indicating that there is no reinforcement at all. F
When the RM strength is 1.5 times or more the Al1 strength, Mgli
A suitable range of t% is 18 to 30%.

This is approximately 17 to 80% by volume of the β phase. If the liquid phase exceeds 50% by volume, IJ wax oozes out during manufacturing, and the plate shape cannot be maintained uniformly, making it impossible to handle using the solid phase method. As described above, the optimum volume ratio is 17 to 50%.

Exactly the same effect as above is obtained by Mg 85-69%, A15
It can also be obtained using ~31% of the alloy as matrix.

Effects of the Invention As explained above, according to the method of the present invention, since the forming temperature is low, it is possible to avoid the deterioration of the strength characteristics of reinforcing fibers and the formation of brittle intermetallic compounds, and it is possible to produce high-strength FRM. be able to. In addition, like the solid-phase method, it can be processed in a short time despite the low temperature, and at the same time, unlike the solid-phase method, it does not require high-pressure generators, resulting in high productivity and low equipment costs. A strong FRM can be manufactured at low cost.

[Brief explanation of drawings]

Figure 1 is l? Fig. 2 is a perspective view showing an example of laminated groove formation of FRM manufactured by the method of this invention, and Fig. 3 shows the results of tensile test of FRM and fiber FIG. 4 is a diagram showing the compatibility and the relationship between FRM strength and Mg weight % in the same example. 1... Al-Mg alloy matrix, 2... Reinforced fiber. Applicant Sumitomo Metal Industries Co., Ltd. Agent Press 1) To Yukiken Figure 1 Part 2 Figure 3 Figure 4 Factor MgI Min (%)

Claims (1)

[Claims] Production of a metal matrix composite material using an Al-Mg alloy as a matrix, and pressurizing at a temperature between the eutectic point and the melting point of the Al-Mg alloy when integrally molding the matrix and reinforcing fibers. Method.