(1. 江西理工大學(xué) 材料科學(xué)與工程學(xué)院，贛州 341000；
2. 江西理工大學(xué) 機(jī)電工程學(xué)院，贛州 341000)
摘 要: 以雙主相法制備不同Ce含量的燒結(jié)(CePrNd)-Fe-B磁體，研究不同回火溫度下磁體的磁性能，并對微觀組織斷口進(jìn)行BSE和EDS分析。結(jié)果表明：含Ce磁體的共晶溫度和居里溫度隨Ce含量的增加呈減小的趨勢；回火溫度對燒結(jié)(CePrNd) -Fe-B磁體的剩磁影響不顯著；Ce取代量為12%(質(zhì)量分?jǐn)?shù))的磁體經(jīng)回火溫度410 ℃處理后，內(nèi)稟矯頑力從762.6 kA/m上升到1357.2 kA/m，相應(yīng)提高77.97%，方形度達(dá)到最佳值0.953。經(jīng)410 ℃回火后，磁體主相晶粒間的微觀結(jié)構(gòu)形成的殼核結(jié)構(gòu)，晶界分布著較多的條狀富Nd相分布。富Nd相中的Ce含量增高，浸潤性相對提高，因而有利于減少主相晶粒間的反向磁耦合，提高了室溫和高溫下磁體的內(nèi)稟矯頑力。
關(guān)鍵字: Ce-Fe-B磁體；雙合金；磁性能；回火
（1. School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China）
Abstract:Resource-saving (PrNdCe)FeB sintered magnets with nominal composition (PrNd)CeFeB were prepared using a dual alloy method by mixing (PrNd)CeFeB with (PrNd)FeB powders. In this work, the magnetic properties at different annealing temperatures were investigated. The microstructures were examined by SEM and EDS. The results show that the eutectic temperature and the Curie temperature of (CePrNd)-Fe-B magnets have a downward tendency with increasing Ce content. When the magnets with substitution of 12% Ce were annealed at 410 ℃, the intrinsic coercivity increases from 762.6 kA/m to 1357.2 kA/m. The Hk/Hcj is improved to peak value of 0.953. The core-shelled structures form between the main phase grains in the magnet annealed at 410 ℃, in which more Nd-rich phases with strip-like distribute at the grain boundary. The wettability of Nd-rich phase is relatively improved with increasing Ce content, which is beneficial to reduce the reverse magnetic coupling between the main phase grains, thus the coercivity of (CePrNd)-Fe-B magnets at the room and high temperature is improved. Strip Nd-rich phase is discovered in the magnet under 410 ℃ annealing condition and Ce content is higher in the Nd-rich phase, the core-shell microstructure deforms which is beneficial to the coercivity of (CePrNd)-Fe-B magnets.
Key words: Ce-Fe-B magnet; dual alloy; magnetic property; annealing
