Effect of Melting Conditions on the Composition of Sm-Fe Alloy
Received:August 08, 2017  Revised:September 03, 2017
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KeyWord:Sm-Fe alloy; smelting atmosphere; crucible material; Samarium volatilization
Yuan Liangliang 华北理工大学 冶金与能源学院
Gao Aimin 华北理工大学 冶金与能源学院
Wang Shuhuan 华北理工大学 冶金与能源学院
Zhao Dingguo 华北理工大学 冶金与能源学院
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      The influence of smelting atmosphere and crucible material on the nitriding process of samarium iron alloy was studied by means of XRD and SEM. The relationship between melting temperature and the amount of samarium volatilization was discussed. The results show that in the process of low vacuum melting, samarium is very volatile and reacts with oxygen to produce refractory material with high melting point, that is, samarium oxide, which makes the alloy not easy to melt; Under the argon atmosphere, the samarium iron alloy melts well and has no impurities. At the same melting temperature, the alumina crucible is more suitable for smelting of Sm-Fe alloy than magnesium oxide crucible, and the degree of reaction with Sm-Fe alloy is smaller. The volatilization of samarium in the alloy increases with the temperature increasing, and the volatilization of samarium reaches 7% at the melting temperature of 1510 ℃.