Sm(CobalFe0.1Cu0.1Zr0.04)z(z=6.5~7.5)磁体的高温磁性能

 在大功率航空发电机等领域，迫切需要研制使用温度超过450 ℃的高温永磁材料。然而，NdFeB永磁材料使用温度低于80 ℃，耐高温NdFeB永磁材料的使用温度也低于150 ℃；商业2∶17型Sm₂Co₁₇永磁体使用温度范围低于300 ℃。近年来，研制使用温度超过450 ℃的高温永磁材料成为该领域研究的热点问题。本文用粉末冶金的方法，制备了不同z值的Sm(Co_balFe_0.1Cu_0.1Zr_0.04)_z(z=6.5~7.5)合金样品。系统研究了z值对合金结构、磁性能的影响规律。室温下z=7.3的合金矫顽力最大，超过2 400 kA/m；773 K时，z=7.1的合金矫顽力最大，达到640 kA/m。高温条件下合金的磁性能和退磁曲线的方形度降低。合金z值对内禀矫顽力温度系数影响显著，其中z=6.9的合金，内禀矫顽力温度系数最低，仅为-0.052%/℃，z≤6.7或z≥7.1时，均导致内禀矫顽力温度系数增大。

High Temperature Magnetic Property of Sm(Co_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.04))_z(z = 6.5-7.5) Magnets

There is a great demand for high temperature permanent magnet materials which are over 450 ℃ in temperature and can be used in high-power generators in the field of aviation. However, the temperatures for use of NdFeB permanent magnet materials are lower than 80 ℃. Even high temperature NdFeB permanent magnet materials can only be used at temperatures lower than 150 ℃. The temperature range of 2 : 17-Sm_2Co_(17) permanent magnets for business use is below 300 ℃. tn recent years, the development of high tem-perature permanent magnetic materials with using temperatures exceeding 450 ℃ has become a hot issue in the field of study. In this article the Sm(CO_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.04))_z(z = 6.5 ～ 7.5) alloys are prepared by powder met-allurgy. The effect of z value on the structure and magnetic properties of Sm(CO_(bal)Fe_(0.1)Cu_(0.1)Zr_(0.04))_z alloys is studied. The highest room temperature intrinsic coercivity iHe is achieved at more than 2 400 kA/m for z= 7.3. A coercivity of more than 640 kA/m is obtained at 773 K for z=7.1. The temperature coefficient of coer-civity is-0. 052%/℃ for z=6.9. The temperature coefficient of coercivity increases for z≤6.7 or z≥7.1.