WANG Wanting1,2, WANG Shuhuan1,2, LIU Kun1,2, ZHANG Yikun1
1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Tangshan Key Laboratory of Special Metallurgy and Material Preparation, Tangshan 063210, Hebei, China
Abstract：The vacuum induction melting method can alleviate the oxidation and volatilization problems of SmFe12-based permanent magnet master alloy during the preparation process, and is an effective means to control the components. In order to efficiently prepare SmFe12-based permanent magnet master alloy by vacuum induction melting method, the effects of charging vacuum rate and melting power on the melting effect of Sm0.8Zr0.2Fe8.5Co2Cu0.5Ti alloy were studied from the perspective of theoretical analysis and laboratory research, and the preparation process parameters were determined. The results show that the charging vacuum rate of raw material is less than 10%, which is conducive to the retention of Sm and the melting of metal particles. Compared with the melting effect of liter power melting and one-step melting, the reduced power melting effect is better. The optimum preparation process parameters are determined as follows, the starting melting power is 24-28 kW when the charging vacuum rate is 5%, and the melting power is reduced to less than 15 kW after heating the metal to boiling. The total melting time is 90 s, which can fully melt the metal raw material and achieve the efficient melting of SmFe12-based permanent magnet master alloy, and the homogenized annealing treatment is carried out at 1 100 ℃ for up to 48 h to obtain Sm0.8Zr0.2Fe8.5Co2Cu0.5Ti alloy with high quality and uniform organization. The study can provide raw materials for the subsequent research of Sm0.8Zr0.2Fe8.5Co2Cu0.5Ti alloy powder or ribbons, and lay foundation for the futher study of microstructure and properties for SmFe12-based permanent magnets with different compositions.
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2023, Vol. 33 
