采用粉末冶金法制备出含Fe、Cu、Zr的Sm2 Co17型合金磁粉,通过XRD、扫描电子显微镜等研究了各级热处理后合金的显微组织和相结构的变化.结果表明:铸锭合金由TbCu7型(P6/mmm,No.191)六方结构的2:17相组成,固溶处理4 h后获得了由TbCu7型六方和Th2Zn17型菱方结构组成的固溶体;等温时效处理后,(TbCu7+Th2Zn17)结构在转变成Th2Zn17型结构的同时析出了富Sm和富Cu的沉淀相.通过优化合金的热处理工艺,经1170℃固溶处理和830℃等温时效后获得了密度为6.7 g/cm3,磁性能为:Bx=0.565 T,Hci=615.2 kA/m,(BH)max=53 kJ/m3的各向同性Sm(Co0.66Fe0.25Cu0.07Zr0.02)8.0粘结磁体.
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