Abstract: 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∶17Sm2Co17permanent 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(Co_balFe_0.1Cu_0.1Zr_0.04)_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(Co_balFe_0.1Cu_0.1Zr_0.04)_z 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%/℃ forz=6.9. The temperature coefficient of coercivity increases forz≤6.7 or z≥7.1.

Key words: Sm(Co_balFe_0.1Cu_0.1Zr_0.04)_z, alloys, phase component, high temperature properties, magnetic properties, intrinsic coercivity, temperature coefficient of coercivity