(北京鋼鐵研究總院功能材料所, 北京 100081)
摘 要: 探索了雙合金法結(jié)合速凝工藝制備高檔磁體的新途徑， 比較了不同合金成分速凝帶經(jīng)退火熱處理前后其微晶結(jié)構(gòu)和疇結(jié)構(gòu)的變化，以及速凝帶中Nd2Fe17(B)相的存在對中間過程工藝的要求乃至最終磁體性能的影響；探討了改善高性能永磁材料力學性能的新思路； 研究了高溫磁體的穩(wěn)定性機理， 獲得的Sm2Co17高溫磁體最大磁能積(BH)max,500℃≥76.4kJ/m3， 內(nèi)稟矯頑力iHc,500℃≥629kA/m； 同時介紹了用熔煉方法合成的新型SmCo7-xMx(M=Cu,Ga)化合物，預計可開發(fā)成為新型永磁材料或高溫磁體。
關(guān)鍵字: 速凝帶； 疇結(jié)構(gòu)； 高溫磁體； 力學特性
（Division of Functional Materials, Central Iron & Steel Research Institute, Beijing 100081, China）
Abstract:A new processing technology for high property permanent magnets combining bi-alloy method and strip casting technique was investigated. The structure change of crystallite and domain of rapid solidification strip with different compositions before and after annealing treatment, and the influence on the final performance and its requirement for the inter-process due to the existence of Nd2Fe17(B) phase in the strip were compared. A new approach to improve its mechanical characteristics was discussed. The stable mechanism of magnets using in high temperature was studied. The magnets of Sm2Co17 with (BH)max,500℃≥76.4kJ/m3 and iHc,500℃≥629kA/m are gained. Meanwhile a new compound SmCo7-xMx(M=Cu, Ca) was synthesized through melting which is expected to become a type of permanent magnet or high temperature magnets.
Key words: strip casting; domain structure; high temperature magnets; mechanical characteristics
