Particle and crystal whisker reinforced magnesium alloy composite material and preparation method thereof

Abstract

The invention provides a preparation method of a particle and crystal whisker reinforced magnesium alloy composite material. The preparation method is characterized by comprising the following steps of providing silicon carbide powder and titanium carbide powder; obtaining activated silicon carbide powder and activating the titanium carbide powder; providing an aqueous solution with a nickel hydroxide precipitate; placing the activated silicon carbide powder and the activated titanium carbide powder into the aqueous solution with the nickel hydroxide precipitate, and carrying out primary stirring to obtain a first mixture; carrying out primary roasting on the first mixture so as to obtain a particle reinforcement mixture; providing calcium carbonate crystal whiskers, and carrying out ultrasonic dispersion on the calcium carbonate crystal whiskers; providing an aqueous solution with a copper hydroxide precipitate; placing the ultrasonically dispersed calcium carbonate crystal whiskers into an aqueous solution with a copper hydroxide precipitate, and carrying out secondary stirring to obtain a second mixture; carrying out secondary roasting on the second mixture to obtain the calciumcarbonate whiskers with the surface coatings; and placing a magnesium-aluminum alloy, the particle reinforcement mixture and the calcium carbonate crystal whiskers with the surface coatings into a vacuum induction furnace.

Description

technical field [0001] The invention relates to the field of magnesium-based composite materials, in particular to a particle and whisker reinforced magnesium alloy composite material and a preparation method thereof. Background technique [0002] Pure magnesium is soft and cannot be directly used as a structural material, so it is usually alloyed before use. Compared with other metal materials, magnesium alloy has the following advantages: (1) Magnesium is one of the lightest structural materials at present. Among the existing engineering metals, magnesium alloy has the smallest density, usually 1.75-1.85g / cm 3 , about one-fourth of the density of zinc and one-fifth of the density of steel. (2) Magnesium alloys have high specific strength and specific stiffness. (3) It has good castability and dimensional stability. (4) It has a good damping coefficient and good shock absorption, which is beneficial to shock absorption and noise reduction. (5) Magnesium can obtain satis...

AI Technical Summary

Problems solved by technology

[0003] Although magnesium alloys have the above-mentioned excellent mechanical properties, with the advancement of science and technology, the existing ordinary magnesium alloys can no longer meet the current needs. In order to improve the mechanical properties of magnesium alloys, the prior art proposes adding reinforcement to magnesium alloys. Particles and / or whiskers, although this magnesium alloy composite material has higher performance, it also has the following defects: due to the high surface tension of liquid magnesium alloy, it is difficult for ceramic particles and whiskers to mix uniformly with liquid magnesium alloy , the performance of the composite material is unstable, and the performance uniformity is poor. The macroscopic performance is that there is a large gap between the mechanical properties of the magnesium alloy composite material and the theoretical calculation value.

Images