Multi-stage Tungsten Particle Reinforced Aluminum Matrix Composites

Tungsten particulate reinforced aluminium matrix composite is a kind of lightweight structural and functional integrated material with high temperature resistance, high strength and high wear resistance. It has great application potential and practical value, and has a wide range of applications in aviation, aerospace, automobile and electronics.

In order to solve the related problems, some scholars have developed a method for preparing a multi-stage structure tungsten particle reinforced aluminum matrix composite material, which specifically includes the following steps:

(1) Weigh 400g of tungsten powder, 200g of aluminum powder, and 3kg of stainless steel grinding ball. Ball milling is carried out in a argon-protected environment using a planetary ball mill at a rotating speed of 400 rpm. The ball milling time is 8h, and Al is obtained. Coated W particle cluster composite powder;

(2) Weigh 750g of Al-coated W-particle cluster composite powder and 250g of aluminum powder in step (1), mix under argon-protected condition using a double-cone mixer, and the weight ratio of grinding ball to powder 1:1, mixing time is 8h, to obtain a composite powder;

(3) The composite powder in the step (2) is vibrated in a pre-made aluminum sleeve, and subjected to vacuum heating and degassing treatment, the degassing temperature is 400 °C, and the heating rate is 50 °C / h, The vacuum is lower than 1×10-3Pa, the degassing time is not less than 12h, and the vacuum is less than 1×10-3Pa;

(4) The composite powder in the step (3) is heated to 520 °C at a heating rate of 10 °C / min, and kept under a hot isostatic pressing condition of 200 MPa for 2 h, and the composite material is formed by cooling the furnace to room temperature. The use of a lathe to remove the surface aluminum sheath provides a multi-stage structured tungsten particle reinforced aluminum matrix composite.

The multi-stage structure tungsten particle reinforced aluminum matrix composite material prepared by the above process has the characteristics of strong interface bonding force and good mechanical property, the density is greater than 99.5%, the room room bending strength is greater than 400 MPa, and the room temperature tensile strength is greater than 300 MPa. The room temperature yield strength is greater than 200MPa, and the room temperature elongation is 6%. It is a lightweight high-strength composite material and has great application potential in the aerospace industry.

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