HD Processes in the Production of SmCo<,5> Permanent Magnets
The application of extreme hydrogen-decrepitation (HD) process using high-pressure disproportionation was extended to Sm-Co<,5>-type-alloy. The alloy with nominal composition of Sm<,36>Co<,64> was treated under 1.0~2.0 MPa H<,2> pressure for several hours at room temperature for decrepitation. After disproportionation were high hydrogen pressures, the bulk alloys were disproportionated into particles with a size of 200. Investigations by powder X-ray diffractometer (XRD) showed, the after HD sample crystallized in the hexagonal CaCu<,5>-type structure. The temperature dependence of pressure analysis (TPA) curve of the SmCo<,5> alloy showed that the hydrogen absorption temperature was about 150℃. Cylindrical sintered magnets of composition Sm <,36>Co<,64> were prepared using HD ball milled, isostatic pressing, vacuum sintering and subsequent heat treatment. The demagnetization curves showed that the HD processes could improve the magnetic properties and squareness factor of the SmCo<,5> sintered magnet.
hydrogen decrepitation SmCo<,5> alloys sintered magnets rare earths
Liu Tao(刘涛) Li Wei(李卫) Liu Xingmin(刘兴民) Li Jiankui(李建奎) Guo Zhaohui(郭朝晖)
Division of Functional Materials,Central Iron & Steel Research Institute, Beijing 100081, China Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
191-193
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）