(北京科技大學(xué) 材料科學(xué)與工程學(xué)院, 北京 100083)
摘 要: 研究了HDDR工藝的吸氫歧化（HD）和脫氫再?gòu)?fù)合(DR)階段在HDDR Nd13Fe80B7各向異性形成過(guò)程中的作用。 結(jié)果發(fā)現(xiàn)： 短的吸氫歧化時(shí)間、 高的脫氫溫度和緩慢的脫氫處理均有助于Nd13Fe80B7材料獲得各向異性； 當(dāng)吸氫歧化時(shí)間過(guò)長(zhǎng)時(shí), HDDR Nd13Fe80B7成為各向同性的材料, 即使高的脫氫溫度和緩慢的脫氫處理也不能使它獲得各向異性。 這表明合適的吸氫歧化是HDDR Nd13Fe80B7各向異性形成的關(guān)鍵, 而高的脫氫溫度和緩慢的脫氫處理是HDDR NdFeB獲得高各向異性的保證。 使用XRD和TEM對(duì)Nd13Fe80B7材料吸氫歧化過(guò)程的觀察表明, 除NdH2、 Fe和Fe2B外， 沒(méi)有發(fā)現(xiàn)其它相, HDDR Nd13Fe80B7各向異性的產(chǎn)生與條紋狀的歧化組織相關(guān)。
關(guān)鍵字: HDDR； Nd13Fe80B7； 各向異性
anisotropy in Nd13Fe80B7
LI Chun-he, XIAO Yao-fu, WANG Run
（School of Materials Science and Engineering,
University of Science and Technology Beijing,
Beijing 100083, China）
Abstract:The function of disproportionation and desorption stages of HDDR process in the formation of magnetic anisotropy was studied. Experiments exhibit that relatively short disproportionation time, high desorption temperature and slow desorption treatment are beneficial to attainment of anisotropy. When disproportionation time is longer, HDDR Nd13Fe80B7 magnetic powder becomes isotropic, and high desorption temperature and slow desorption treatment cannot make them obtain anisotropy. This indicates that the origin of anisotropy in NdFeBtype HDDR material is contributed by disproportionation stage, and high desorption temperature and slow desorption treatment are the guarantee of obtaining strong anisotropy. No other phase except NdH2, α-Fe and Fe2B has been found in the disproportionation step with XRD and TEM, and the formation of HDDR Nd13Fe80B7 anisotropy may be related to the early lamella disproportionation structure.
Key words: HDDR； Nd13Fe80B7； anisotropy
