本文主要研究内容
作者席龙龙(2019)在《富Ce液相合金添加对烧结Ce-Fe-B磁体磁性能的影响》一文中研究指出:传统的钕铁硼永磁材料,严重依赖稀土金属Nd和Pr,而稀土储量最为丰富、价格低廉的稀土Ce长期积压得不到有效利用。发展高丰度Ce磁体,不仅大幅度降低稀土永磁体的原材料成本,而且使可用于稀土永磁材料的稀土资源翻了一番,这对于我国稀土资源的平衡利用具有重要意义。近年来,研究开发高丰度Ce磁体已成为相关领域科研人员和生产企业共同关注的热点。然而,当Ce含量(Ce/(50)RE)超过50%,特别是Ce含量达到80%后,微结构观察发现:大量REFe2相(Laves相)聚集在晶界角隅处,难以形成理想的晶界组织,烧结Ce-Fe-B磁体的磁性能显著恶化。但迄今为止,尚没有人研究通过改变富铈晶界相的成分和结构来改善Ce-Fe-B烧结磁体的微结构。在此背景下,本文首先研究了名义成分为[Ce0.8(Gd,Ho)0.2]15.1Fe75.7B7.2M2(at%)烧结Ce-Fe-B磁体的微结构和磁性能,然后通过Al/Cu元素掺杂对富Ce液相合金进行结构设计,系统研究了不同Al/Cu含量对富Ce液相合金的微观形貌、相组成和热行为的影响,最后采用双合金方法制备烧结Ce-Fe-B磁体,有效改善了磁体的微结构和磁性能。全文主要研究内容和结论如下:(1)本研究Ce-Fe-B速凝合金带中形成了不均匀的片状晶结构,贴辊面一侧结晶细小,自由面一侧结晶粗大,造成这种现象的原因主要是Ce2Fe14B主相凝固温区过窄。Ce-Fe-B速凝带主要由RE2Fe14B和REFe2相组成,未见明显α-Fe相析出。研究发现合金薄带中存在两种组成的“孤岛状”残留固相:RE2Fe17相和RE:Fe?1:31:4的中间过渡RE-Fe相,这是由于包晶反应不完全造成的。(2)Al/Cu掺杂会影响富Ce液相合金的微结构、相组成和熔点。原始富Ce合金主要由CeFe2,Ce2Fe17和?Ce相组成,且Ce2Fe17相呈树枝晶形态生长。随着Al/Cu取代量的增加,CeFe2和Ce2Fe17相的体积分数逐渐减少,Ce2Fe17树枝晶消失。当Al含量为10at.%时,合金中出现Ce-Al系列共晶组织,合金熔点由原始合金的942?C降低到856?C;而当Cu含量为6at.%时,合金中只出现单一CeCu和?Ce的共晶结构,合金熔点由的942?C降低到895?C。(3)通过晶界合金添加制备烧结Ce-Fe-B磁体,优化了磁体的微结构,改善了晶界液相的流动性,晶界相占比增加。最终磁体的Hcj、(BH)max和方形度分别增加8%,22%,24%(Al掺杂合金)和16%,35%,17%(Cu掺杂合金)。此外,研究发现Ce/Cu元素对热处理条件表现出完全不同的分布特征。Ce在烧结和回火态主要富集在晶界,而微量Cu在烧结过程中会部分溶解在RE2Fe14B晶粒中,回火后Cu元素会从晶粒部分扩散至晶界中。
Abstract
chuan tong de nv tie peng yong ci cai liao ,yan chong yi lai xi tu jin shu Ndhe Pr,er xi tu chu liang zui wei feng fu 、jia ge di lian de xi tu Cechang ji ji ya de bu dao you xiao li yong 。fa zhan gao feng du Ceci ti ,bu jin da fu du jiang di xi tu yong ci ti de yuan cai liao cheng ben ,er ju shi ke yong yu xi tu yong ci cai liao de xi tu zi yuan fan le yi fan ,zhe dui yu wo guo xi tu zi yuan de ping heng li yong ju you chong yao yi yi 。jin nian lai ,yan jiu kai fa gao feng du Ceci ti yi cheng wei xiang guan ling yu ke yan ren yuan he sheng chan qi ye gong tong guan zhu de re dian 。ran er ,dang Cehan liang (Ce/(50)RE)chao guo 50%,te bie shi Cehan liang da dao 80%hou ,wei jie gou guan cha fa xian :da liang REFe2xiang (Lavesxiang )ju ji zai jing jie jiao yu chu ,nan yi xing cheng li xiang de jing jie zu zhi ,shao jie Ce-Fe-Bci ti de ci xing neng xian zhe e hua 。dan qi jin wei zhi ,shang mei you ren yan jiu tong guo gai bian fu shi jing jie xiang de cheng fen he jie gou lai gai shan Ce-Fe-Bshao jie ci ti de wei jie gou 。zai ci bei jing xia ,ben wen shou xian yan jiu le ming yi cheng fen wei [Ce0.8(Gd,Ho)0.2]15.1Fe75.7B7.2M2(at%)shao jie Ce-Fe-Bci ti de wei jie gou he ci xing neng ,ran hou tong guo Al/Cuyuan su can za dui fu Ceye xiang ge jin jin hang jie gou she ji ,ji tong yan jiu le bu tong Al/Cuhan liang dui fu Ceye xiang ge jin de wei guan xing mao 、xiang zu cheng he re hang wei de ying xiang ,zui hou cai yong shuang ge jin fang fa zhi bei shao jie Ce-Fe-Bci ti ,you xiao gai shan le ci ti de wei jie gou he ci xing neng 。quan wen zhu yao yan jiu nei rong he jie lun ru xia :(1)ben yan jiu Ce-Fe-Bsu ning ge jin dai zhong xing cheng le bu jun yun de pian zhuang jing jie gou ,tie gun mian yi ce jie jing xi xiao ,zi you mian yi ce jie jing cu da ,zao cheng zhe chong xian xiang de yuan yin zhu yao shi Ce2Fe14Bzhu xiang ning gu wen ou guo zhai 。Ce-Fe-Bsu ning dai zhu yao you RE2Fe14Bhe REFe2xiang zu cheng ,wei jian ming xian α-Fexiang xi chu 。yan jiu fa xian ge jin bao dai zhong cun zai liang chong zu cheng de “gu dao zhuang ”can liu gu xiang :RE2Fe17xiang he RE:Fe?1:31:4de zhong jian guo du RE-Fexiang ,zhe shi you yu bao jing fan ying bu wan quan zao cheng de 。(2)Al/Cucan za hui ying xiang fu Ceye xiang ge jin de wei jie gou 、xiang zu cheng he rong dian 。yuan shi fu Cege jin zhu yao you CeFe2,Ce2Fe17he ?Cexiang zu cheng ,ju Ce2Fe17xiang cheng shu zhi jing xing tai sheng chang 。sui zhao Al/Cuqu dai liang de zeng jia ,CeFe2he Ce2Fe17xiang de ti ji fen shu zhu jian jian shao ,Ce2Fe17shu zhi jing xiao shi 。dang Alhan liang wei 10at.%shi ,ge jin zhong chu xian Ce-Alji lie gong jing zu zhi ,ge jin rong dian you yuan shi ge jin de 942?Cjiang di dao 856?C;er dang Cuhan liang wei 6at.%shi ,ge jin zhong zhi chu xian chan yi CeCuhe ?Cede gong jing jie gou ,ge jin rong dian you de 942?Cjiang di dao 895?C。(3)tong guo jing jie ge jin tian jia zhi bei shao jie Ce-Fe-Bci ti ,you hua le ci ti de wei jie gou ,gai shan le jing jie ye xiang de liu dong xing ,jing jie xiang zhan bi zeng jia 。zui zhong ci ti de Hcj、(BH)maxhe fang xing du fen bie zeng jia 8%,22%,24%(Alcan za ge jin )he 16%,35%,17%(Cucan za ge jin )。ci wai ,yan jiu fa xian Ce/Cuyuan su dui re chu li tiao jian biao xian chu wan quan bu tong de fen bu te zheng 。Cezai shao jie he hui huo tai zhu yao fu ji zai jing jie ,er wei liang Cuzai shao jie guo cheng zhong hui bu fen rong jie zai RE2Fe14Bjing li zhong ,hui huo hou Cuyuan su hui cong jing li bu fen kuo san zhi jing jie zhong 。
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论文作者分别是来自钢铁研究总院的席龙龙,发表于刊物钢铁研究总院2019-08-16论文,是一篇关于烧结论文,富液相合金论文,磁性能论文,微结构论文,元素分布论文,钢铁研究总院2019-08-16论文的文章。本文可供学术参考使用,各位学者可以免费参考阅读下载,文章观点不代表本站观点,资料来自钢铁研究总院2019-08-16论文网站,若本站收录的文献无意侵犯了您的著作版权,请联系我们删除。