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Preparation method of tungsten-particle-reinforced aluminum-based composite

A particle-reinforced aluminum and composite material technology, which is applied in the field of composite material processing and preparation, can solve the problems that limit the design, processing and application of composite materials, and achieve the effect of large application potential, small anisotropy, and expanded application range

Active Publication Date: 2019-05-03
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hot extrusion process can effectively improve the internal metallurgical bonding state of powder metallurgy products, but due to the three-dimensional compressive stress and shearing effect during the extrusion process, the internal metal matrix and reinforcing phase present a streamline distribution state, and the mechanical properties and microscopic The organizational structure presents obvious anisotropy, which limits the design, processing and application of composite materials under certain conditions of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The tungsten particle-reinforced aluminum-based composite material provided by the present invention is composed of tungsten particles with a mass content of 27%-70%, and the balance of aluminum or aluminum alloy, wherein the aluminum alloy can be 2A12 aluminum alloy, 6063 aluminum alloy and other alloys. Its preparation The method specifically includes the following steps:

[0022] (1) Place the tungsten powder in a double-cone mixer, the weight ratio of the ball to the powder is 1:0.5-2, use ethanol as the mixing medium for 10 hours, and vacuum dry for 10 hours to obtain the pretreated tungsten powder;

[0023] (2) In terms of mass percentage, mix 27%-70% of the pretreated tungsten powder obtained in step (1), 30%-73% of aluminum powder or aluminum alloy powder, and use a double-cone mixer under the protection of argon. Mix the powder evenly under the conditions, the weight ratio of the ball to the powder is 1:0.5-2, and the mixing time is 10-24 hours to obtain a comp...

Embodiment 1

[0032] According to the following steps, the tungsten particle reinforced aluminum matrix composite material composed of 30% tungsten by mass and 70% 2A12 aluminum alloy matrix (6% pretreated tungsten powder and 94% 2A12 aluminum alloy powder by volume percentage) was prepared:

[0033] (1) Pretreatment of tungsten powder

[0034] Weigh 10kg of tungsten powder, the mass ratio of stainless steel grinding balls to tungsten powder is 1:0.5, use ethanol as the mixing medium and use a double cone mixer to mix for 10 hours, and vacuum dry for 10 hours to obtain pretreated tungsten powder;

[0035] (2) Mixed raw materials

[0036] Mix 6 kg of pretreated tungsten powder obtained in step (1) with 14 kg of 2A12 aluminum alloy powder, and use a double-cone mixer to mix for 10 hours under argon protection to obtain a composite powder;

[0037] (3) cold isostatic pressing

[0038] The hydraulic medium (anti-wear hydraulic oil) is isolated from the composite powder obtained in step (2) wi...

Embodiment 2

[0051] The difference from Example 1 is that the thickening step is not performed, and the density of the prepared composite material is 99.8%, the tensile strength of the composite material along the extrusion direction at room temperature is 400MPa, the yield strength is 260MPa, the elongation is 10%, and the impact toughness is 10.5j cm -2 ; The tensile strength at room temperature in the direction perpendicular to extrusion is 360MPa, the yield strength is 205MPa, the elongation is 8%, and the impact toughness is 7.8j cm -2 .

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PUM

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Abstract

The invention belongs to the technical field of processing and preparation of composites, and discloses a preparation method of a tungsten-particle-reinforced aluminum-based composite. The method includes the following steps that (1) ethyl alcohol is used as a mixing medium, tungsten powder is arranged in a mixer for mixing, and pretreated tungsten powder is obtained after vacuum drying; (2) aluminum powder or aluminum alloy powder is mixed with the pretreated tungsten powder obtained in step (1), and composite powder is obtained; (3) cold isostatic pressing, vacuum degassing, hot isostatic pressing sintering, upsetting, hot extrusion and heat treatment are performed on the composite powder obtained in step (2), and the tungsten-particle-reinforced aluminum-based composite is prepared. Bythe aid of the preparation method, the density of the aluminum-based composite can be increased remarkably, the microstructure of the composite can be refined, the anisotropism of the composite can bereduced, and the application range of the aluminum-based composite can be expanded.

Description

technical field [0001] The invention belongs to the technical field of composite material processing and preparation, and in particular relates to a preparation method of tungsten particle-reinforced aluminum-based composite material. Background technique [0002] Particle reinforced aluminum matrix composites generally have the advantages of high specific strength, high specific modulus, fatigue resistance, high temperature creep resistance, heat resistance, wear resistance, high thermal conductivity, low expansion coefficient, adjustable composition, and low density. It has a wide range of applications in the fields of aviation, aerospace, land transportation and electronic information. For example, SiC / Al composite materials have been applied in the fields of helicopter rotors, electronic optical equipment brackets and housings, automotive pistons and brake pads. B 4 C / Al composite materials are used for nuclear fuel storage compartments, diamond / Al composite materials ...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C21/00C22C27/04
Inventor 王健陈隆辉梁秋实王军锋马书旺吕政杨剑杨志民
Owner GRIMAT ENG INST CO LTD
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