Effects of oxygen and carbon on the magnetic properties and microstructure of Sm_2Co_(17) permanent magnets

作     者：TIAN Jianjun ZHANG Shengen QU Xuanhui 

作者机构：School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China 

出 版 物：《Rare Metals》 (稀有金属（英文版）)

年 卷 期：2007年第26卷第4期

页      面：299-304页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：This project is financially supported by the Program for New Century Excellent Talents in Universities  Beijing Natural Science Foundation of China (No. 2073026) 

主　　题：permanent magnets oxygen carbon magnetic properties microstructure 

摘      要：The research on the sintered Sm2Co17 permanent magnets prepared by metal injection molding is still at the exploratory stage. Carbon and oxygen are two key factors that influence the magnetic properties. In this article, the effects of oxygen and carbon on the properties and microstructure of the magnets have been studied. The results indicate that oxygen consumes the effective Sm content of the magnets and forms Sm2O3-the non-magnetism phase, which result in the deterioration of the magnetic properties. Besides, the magnetic properties decrease in evidence with increasing carbon content. The main factor that affects the magnetic properties is the deterioration of the microstructure of the magnets. The Sm（Co, Cu）5 phase decreases, whereas the cell size increases with the increase of the carbon content. When the carbon content is above 0.43 wt.%, the Sm（Co, Cu）5 phase is not enough to form a uniform cellular microstructure. Thus the magnetic properties disappear. ZrC is detected in the magnets by XRD when the carbon content is above 0.21 wt.%. ZrC also reduces the properties of the magnets.