A casting anti-friction and wear-resistant high-aluminum zinc-based composite material and its preparation method

Abstract

The invention relates to a casting anti-friction and abrasion-resistant high aluminum zinc-based composite material and a preparation method thereof. The technical scheme is that the composite material takes zinc and aluminum as the base, and takes copper and magnesium as main alloy elements; trace alloy elements of strontium, titanium, boron, rare earth lanthanum and the like, and micron siliconcarbide and micron graphite non-metallic ceramic reinforcement particles are added, smelting is carried out, and thus substrate molten liquid is obtained; and the substrate molten solution is subjected to the deep processing technology of powder spraying, stirring and ultrasonic combined treatment so that the silicon carbide particles with abrasion-resistant performance and the graphite particleswith anti-friction performance can be well immersed in the substrate molten liquid and be uniformly dispersed and distributed in the composite material accordingly, and thus the fine-grained casting anti-friction and abrasion-resistant high aluminum zinc-based composite material obtained. The casting anti-friction and abrasion-resistant high aluminum zinc-based composite material has the characteristics of simple technology and low preparation cost. The reinforcement particles of the prepared product are uniformly distributed, and the composite material are excellent in plasticity, toughness and abrasion resistance, and stable in quality.

Description

technical field [0001] The invention relates to the technical field of a high-aluminum zinc-based composite material. In particular, it relates to a casting anti-friction and wear-resistant high-aluminum zinc-based composite material and a preparation method thereof. Background technique [0002] ZA27 alloy has the best comprehensive performance among the currently applied Zn-Al series alloys. It has high strength, excellent friction and wear properties, good machining performance and casting process performance, and its cost is low and has been successful in the industry. It replaces the use of tin bronze material as sliding wear-resistant parts, thus saving the scarce copper resources in our country. However, due to the temperature rise of high-aluminum-zinc alloys during high-speed, heavy-load and long-term friction processes, the wear resistance at high temperatures is greatly reduced, which limits the promotion and application of this material to a large extent. A com...

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Problems solved by technology

[0003] "A wear-resistant zinc-aluminum alloy and its smelting process" (98110581.5) patent technology, the wear-resistant zinc-aluminum alloy produced has improved compared with the traditional ZA27 series in terms of structure refinement and mechanical properties, but under high temperature The scope of application has not been strengthened. At the same time, the hard spots with higher strength and hardness in the matrix are not obvious, and the soft spots with lubricating and anti-friction effects are not obvious. The anti-friction and wear resistance performance needs to be improved.

"A preparation method of silicon carbide-reinforced high-aluminum zinc-based composite material" (CN201710831374.1) patented technology, the prepared samples obtained evenly distributed silicon carbide hard points, which greatly improved the high-aluminum zinc-based composite material Excellent wear resistance, but no friction-reducing soft particles are added, and the surface of the added silicon carbide needs to be copper-plated, which increases the cost of preparation and reduces the efficiency of production

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