Preparation method of Al-Ti-C-Ce refiner

Abstract

The invention provides a preparation method of an Al-Ti-C-Ce refiner. The preparation method of the Al-Ti-C-Ce refiner mainly comprises the following steps that aluminum powder, titanium powder, graphite powder and Ce2O3 powder are mixed and briquetted into a mixed powder block; an aluminum ingot is heated till the aluminum ingot is completely melted, and thus aluminum melt is obtained; the mixed powder block is pressed into the aluminum melt for a thermal explosion reaction, and thus alloy melt is obtained; the alloy melt is filtered and purified, then the purified alloy melt is poured into a steel mold, and thus the Al-Ti-C-Ce refiner is obtained. According to the preparation method of the Al-Ti-C-Ce refiner, sufficient reaction of elements is guaranteed, the reaction time is short, energy saving and high efficiency are achieved, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of alloy refinement, in particular to an Al-Ti-C-Ce refiner and a preparation method thereof. Background technique [0002] Adding a grain refiner to the alloy can not only refine the as-cast grains and dendrite structure, but also reduce porosity, reduce hot cracking tendency, reduce casting defects, and improve subsequent processing performance. In recent years, with the research on aluminum alloy refiners, Al-Ti-C grain refiners have been developed. The TiC particles formed in the Al-Ti-C grain refiner have attracted extensive attention because of their small size, difficulty in agglomeration, uniform distribution, and good coherence with Al. However, due to the poor wettability of C in Al, the preparation is very difficult. The Al-Ti-C grain refiner is prepared by strong stirring or high-temperature reaction, and the preparation cost is high, which limits the Al-Ti-C grain refinement. Extensive applica...

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Problems solved by technology

However, due to the poor wettability of C in Al, the preparation is very difficult. The Al-Ti-C grain refiner is prepared by strong stirring or high-temperature reaction, and the preparation cost is high, which limits the Al-Ti-C grain refinement. Wide application of chemicals

[0003] In the prior art, the method of introducing pure rare earths into the Al-Ti-C grain refiner is usually used to accelerate the reaction, such as the Al-Ti-C-RE refiner prepared by Zhao Hongliang of Zhengzhou University, etc. However, This method uses fluorotitanate to introduce titanium elements, which will produce a large amount of fluoride gas during the preparation process to pollute the environment, corrode equipment, and easily form fluorine salt inclusions to affect the metallurgical quality of the refiner, and the preparation temperature is relatively high (about 1250 ℃), it needs to be smelted in an induction furnace, with serious burning loss and high energy consumption

Moreover, the cost of pure rare earth elements is high, and there are disadvantages such as easy segregation and insufficient reaction during the reaction process.

[0004] Wang Liandeng of Fuzhou University and others made the rare earth oxide Ce 2 o 3 The Al-Ti-C-Ce refiner was prepared by adding Ce to the Al-Ti-C alloy instead of a single rare earth element, but K was also used in the preparation process 2 TiF 6 , the pollution in the preparation process is large, and the preheating and holding time of the raw materials in the preparation process are long, and the energy consumption is high

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