摘要
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(CobalFe0.1Cu0.1Zr0.04)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2400kA/m;773K时,z=7.1的合金矫顽力最大,达到640kA/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。
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- Sm2Co17 permanent magnets for business use is below 300 ℃. In recent years, the development of high temperature permanent magnetic materials with using temperatures exceeding 450 ℃ has become a hot issue in the field of study. In this article the Sm（CobalFe0.1Cu0.1Zr0.04）z（z=6.5～7.5） alloys are prepared by powder metallurgy. The effect of z value on the structure and magnetic properties of Sm（CobalFe0.1Cu0.1Zr0.04） alloys is studied. The highest room temperature intrinsic coercivity iHc 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 coercivity is -0. 052%/℃ for z=6.9. The temperature coefficient of coercivity increases for z≤6.7 or z≥7.1.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2009年第11期2213-2217,共5页
Acta Aeronautica et Astronautica Sinica
基金
教育部"新世纪优秀人才支持计划"(NCET-04-0165)
