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Aluminum tellurium intermediate alloy and its preparation method and application
In the field of aluminum and aluminum alloy materials, it especially relates to an aluminum tellurium intermediate alloy and its preparation method and application.
Aluminum tellurium intermediate alloy is widely used in machinery manufacturing, transportation machinery, power machinery, chemical industry, aviation industry and military industry because of its abundant resources, light weight, high specific strength, good electrical and thermal conductivity, strong corrosion resistance and other advantages. With the development of automobile, electronics, machinery and other industries towards the direction of lightweight, precision and intelligence, especially the rapid development of the automobile industry, the comprehensive performance of aluminum alloy has been put forward higher requirements. Therefore, how to improve the comprehensive properties of aluminum alloys has become a key and difficult point in the research field of aluminum alloys. The results show that tellurium is a good long-term modifier of Al Si alloy, which can make eutectic silicon fine in the form of flake branching, thus significantly improving the mechanical properties and electrical conductivity of the alloy. In addition, tellurium, as a microalloying element, can also improve the hardness and plasticity of aluminum alloys. At present, tellurium is mainly added in the form of pure tellurium in the preparation of aluminium alloys containing tellurium. Due to the low melting boiling point of tellurium (melting point 452°C, boiling point 1390°C), it is easy to burn oxidation at the conventional melting temperature of aluminum alloy (740°C), resulting in low yield of tellurium in aluminum alloy, and the yield is unstable, difficult to control. At the same time, due to the high density of tellurium (6.25g/cm3), tellurium was prone to segregation precipitation in the smelting process, and there was uneven distribution of tellurium locally and it was deposited in the bottom of the crucible, leading to uneven distribution of tellurium in aluminum alloy and low yield, which affected the mechanical properties and electrical conductivity of aluminum alloy.
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