Aluminum tellurium master alloy and its preparation method and application

Abstract

The aluminum-tellurium master alloy of the present invention is composed of tellurium with a mass fraction of 0.1% to 48% and aluminum with a mass fraction of 52% to 99.9%. The preparation method is as follows: (1) batching; (2) smelting, placing aluminum in Preheat in a heating furnace, heat under the protection of an inert gas or add a covering agent to melt all the aluminum to obtain aluminum liquid, the amount of the covering agent added is 0.5% to 2% of the total mass of aluminum and tellurium, and then Press tellurium into the molten aluminum in batches at 800°C. When all the tellurium is added to the molten aluminum and melted, adjust the temperature to 680-740°C and keep stirring for 5-30 minutes to remove slag. After removing slag, keep the temperature and add refining agent Refining, followed by static heat preservation for 5 to 10 minutes; (3) pouring. The invention also provides the application of the aluminum-tellurium master alloy in the preparation of tellurium-containing aluminum alloys. The invention can improve the tellurium yield in the tellurium-containing aluminum alloy, make the tellurium yield stable and easy to control, and make the tellurium distribution in the aluminum alloy even.

Description

technical field [0001] The invention belongs to the field of aluminum and aluminum alloy materials, and in particular relates to an aluminum-tellurium master alloy and its preparation method and application. Background technique [0002] Due to the advantages of abundant resources, light weight, high specific strength, good electrical and thermal conductivity, and strong corrosion resistance, aluminum alloys are widely used in various fields such as machinery manufacturing, transportation machinery, power machinery, chemical industry, aviation industry, and military. With the development of the automobile, electronics, machinery and other industries towards lightweight, precision and intelligence, especially the rapid development of the automobile industry, higher requirements are put forward for the comprehensive performance of aluminum alloys. Therefore, how to improve the comprehensive properties of aluminum alloys has become an important and difficult point in the resear...

AI Technical Summary

Problems solved by technology

Due to the low melting and boiling point of tellurium (melting point is 452°C, boiling point is 1390°C), burning loss and oxidation are prone to occur at the conventional melting temperature of aluminum alloy (740°C), resulting in low yield of tellurium in aluminum alloy, and Yield is unstable and difficult to control

At the same time, due to the high density of tellurium (6.25g / cm 3 ), tellurium tends to segregate and precipitate during the smelting process, and tellurium is partially distributed unevenly and deposited at the bottom of the crucible, resulting in uneven distribution of tellurium in the prepared aluminum alloy, low yield, and affecting the mechanical properties of the aluminum alloy and electrical conductivity