永磁體磁性能的影響
( 四川大學(xué) 材料科學(xué)與工程學(xué)院， 成都 610065)
摘 要: 研究了磁場(chǎng)熱處理工藝對(duì)Nd10.5Fe76.4Co5Zr2B6.1永磁體組織結(jié)構(gòu)和磁性能的影響，采用XRD、AFM等方法對(duì)合金的組織結(jié)構(gòu)、晶化行為進(jìn)行了研究。結(jié)果表明：與傳統(tǒng)熱處理工藝相比，晶化過(guò)程中外加磁場(chǎng)可促進(jìn)快淬NdFeB粉末的晶化，降低晶化溫度，縮短晶化時(shí)間；磁場(chǎng)熱處理可細(xì)化晶粒，增強(qiáng)晶粒間磁交換耦合作用，提高磁性能；在外加磁場(chǎng)為0.28 T，經(jīng)670 ℃／10 min晶化處理后，可獲得最佳磁性能，Br＝0.670 T，Hcj＝687 kA/m，Hcb＝427 kA/m，(BH)m=75kJ/m3。
關(guān)鍵字: 磁場(chǎng)熱處理；納米復(fù)相磁體；磁性能
magnetic properties of Nd2Fe14B/α-Fe
nanocrystalline permanent magnets
（ College of Materials Science and Engineering,
Sichuan University, Chengdu 610065, China）
Abstract: The crystallization behavior and microstructure of Nd10.5Fe76.4Co5Zr2B6.1 permanent magnets were studied by X-ray diffraction (XRD) and atomic force microscopy (AFM). Effect of magnetic-field heat treatment on microstructure and magnetic properties was discussed. The results show that, compared with the conventional heat treatment, an externally applied magnetic field during heat treatment of a melt-spun NdFeB powder can promote crystallization from amorphous phase, decrease the crystallization temperature and shorten the crystallization time. Magnetic-field heat treatment can refine grains, enhance the exchange coupled interaction between the grains, and increase the magnetic properties. The optimal magnetic properties of Nd10.5Fe76.4Co5Zr2B6.1 (Br＝0.670 T，Hcj＝687 kA/m，Hcb＝427 kA/m，(BH)m=75 kJ/m3) are obtained while annealed at 670 ℃ for 10 min with an external magnetic field of 0.28 T.
Key words: magnetic-field heat treatment; nanocomposite magnets; magnetic properties
