JPS6267105A - Production of matrix powder mixed with reinforcing material - Google Patents

Abstract

PURPOSE:To produce matrix powder mixed with a reinforcing material in which matrix metal and reinforcing material are uniformly mixed by an atomization method by spraying a gas in which the reinforcing material is suspended and mixed to an outlet of a molten metal for the matrix. CONSTITUTION:The molten metal 3 which is to be used as the matrix in a molten metal pan 4 having a heater 5 is ejected from a nozzle 6 in the bottom of the molten metal pan. On the other hand, the gas 10 such as N2 in which the reinforcing material 2 such as SiC whiskers, metallic particles or short fibers is mixed and suspended is sucked and is pressurized by a compressor 11 so as to be ejected from a nozzle 8. The ejected gas is blown to the molten metal ejected from a nozzle 6 to form the metallic grains for the matrix incorporated therein with the reinforcing material. The metallic grains are accumulated in a lower receiving tray 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a method for producing a matrix powder mixed with a reinforcing material during the production process of a metal matrix composite material by powder metallurgy.

[Conventional technology]

In the production of composite materials using powder metallurgy, the key to uniformly mixing the matrix metal powder with the reinforcing material made of sinterable metal particles, whiskers, or short fibers is the key to the machine manufacturing of composite products. It is an important factor that controls the characteristics of

Conventionally, the following methods have been used to mix such important reinforcing materials and matrix metal powder.

(1) Wet mixing method A mixing method in which the reinforcing material and matrix metal powder are stirred in a solvent.

(2) Dry mixing method A mixing method in which the reinforcing material and the matrix metal powder are mixed in an air stream.

[Problem that the invention seeks to solve]

In the case of the above-mentioned conventional method, if the diameter of the matrix metal powder is 10μ or more in both (1) and (2), the reinforcing material 2 is inserted between the particles of the matrix metal powder 1 as shown in FIG. The mixture was largely separated and scattered, and uniform mixing could not be obtained.

That is, in order to obtain a uniform mixture of the reinforcing material 2 and the matrix metal powder, it was necessary that the matrix metal powder be a fine powder of 10 μm or less.

On the other hand, matrix metal powder is manufactured by the well-known 71-mize method, and in order to obtain fine particles of 10μ or less from the matrix metal powder obtained by this method, the yield is low, at most 10%, and it is very costly. was high.

[Means for solving problems]

The present invention was made in order to solve the above-mentioned problems, and in the production of metal composite materials, a mixed powder of matrilaus metal and reinforcing material is created by an atomization method using a gas in which reinforcing material is mixed in suspension. The present invention provides a method for producing a reinforcing material mixed matrix powder with characteristics.

[Effect]

In an apparatus that produces matrix metal powder using the atomization method, a gas containing a suspended reinforcing material is sprayed at the outlet of the molten matrix metal, atomization is performed, and the reinforcing material is mixed by infiltrating the matrix metal particles. It is possible to create a matrix powder. Regardless of the size of the J Rematrix metal particles,
It is possible to always obtain a matrix powder in which the reinforcing material is uniformly mixed.

〔Example〕

FIG. 1 is a schematic diagram of an embodiment of the present invention. In the figure, 3 is the molten metal of the matrix metal, which is stored in the molten metal pot 4, and the molten metal I/! A heating device 5 is provided on the outer periphery of 4. Further, a gas reservoir 7 is provided surrounding the molten metal spouting nozzle 6 at the bottom of the molten metal pot 4, and a gas spouting nozzle 8 is installed at the bottom of the gas reservoir 7 to blow gas from the surroundings toward the outlet of the molten metal spouting nozzle 6. It is designed to be sprayed. Next, reference numeral 9 is a tank filled with reinforcing material-mixed gas 10 in which reinforcing material 2 is suspended. ing. In addition, 12 is a saucer.

Next, this effect will be explained.

The matrix metal molten metal 3 is ejected from the heated molten metal ladle 4 through the ejection nozzle 6 , and at the same time, the compressor 11 is driven to suck the gas 10 mixed with the reinforcing material 2 from the tank 9 through the gas reservoir 7 . Gas jet nozzle 8
When the mixed gas 10 is sprayed more toward the outlet of the molten metal spouting nozzle 6, the molten metal 3 becomes granular and hardens into powder mixed with the reinforcing material 2 as shown in FIG. is accumulated in the saucer 12.

As one of the examples, reinforcing material: SiC whiskers, matrix: 6061Aj (JIS) atomizing gas, 200 g of reinforcing material is freely dispersed in 1 m' of NIl gas.Atomizing conditions: Gas pressure: 6 kg/ci Gas flow rate: 40 g/ sec Molten metal flow rate: 150 g/see Using the reinforcing material mixed matrix powder manufactured using the method of the present invention under the following conditions, namely, volumetric ratio Vf 715% Molding conditions Heating temperature 2 630°C Pressurized crab 30
Composite material A was manufactured by heat treatment T 6 (JIS).Furthermore, as a comparative material, matrix metal powder 6061 with a particle size of ttg25 or less was used.
Composite B was prepared by mixing human and reinforcing material SiC whiskers using the conventional method, using the same volumetric ratio, molding conditions, and heat treatment as composite A, and testing the tensile strength and elongation of each. Comparative tables of tensile strength and elongation as shown in FIGS. 3 and 4 were obtained. In the figure, ■
is a curve showing the tensile strength and elongation rate of Composite A and Composite B at each test temperature.

〔Effect of the invention〕

As shown in FIGS. 3 and 4, the strength of the composite A made from the matrix powder mixed with the reinforcing material according to the present invention is 30 to 40 times higher than that of the composite B made from the matrix powder mixed by the conventional method. %, an improvement of 30 to 50% in elongation can be seen.

Furthermore, since the yield in manufacturing the matrix powder has increased, there is also a significant effect on cost reduction.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a schematic diagram showing a matrix powder of the present invention and a reinforcing material, and Figs. 3 and 4 are composite materials. A, a curve diagram of the tensile strength and elongation rate of No. 11, and FIG. 5 is a diagram showing the state of the Sox metal powder and reinforced H, which are filtered by the conventional method. 1: MAJSU NOX metal powder, 2: Reinforcement (I, 3:)
Weight, 4: Molten metal pot, 5: Heating device, 6: Spout nozzle (,
7: Gas reservoir, 8; Gas jet nozzle, 9: Tank, 10: Reinforced gas, 11: Compressor, 1
2: UllTl. Agent Patent Attorney Tadashi Sato Year 3 Figure 9/rnrn2 The 4th rl that burst into tears! J% 115!1

Claims (1)

[Claims] A method for producing a matrix powder mixed with a reinforcing material, characterized in that, in the production of a metal composite material, a mixed powder of a matrix metal and a reinforcing material is produced by an atomization method using a gas containing a suspended reinforcing material.