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高溫900 ℃回火在燒結(jié)NdFeB制備中的作用
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國(guó)家自然科學(xué)基金（20806093），山東省自然科學(xué)基金（ZR2011EMQ001），青島市計(jì)劃（11-2-4-4-(10)-jch），中央高?；究蒲袠I(yè)務(wù)費(fèi)


Effect of High Temperature 900 oC Tempering on Magnetic Properties of NdFeB
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    高溫回火處理對(duì)燒結(jié)釹鐵硼磁體性能影響研究表明：經(jīng)不同高溫T1回火處理后再低溫T2=600 ℃回火處理，磁體剩磁Br和矯頑力iHc隨T1溫度升高而增大，在900 ℃時(shí)有最佳值，進(jìn)一步升高T1磁體的Br和iHc下降。在相同T2回火條件?下，經(jīng)歷高溫回火的磁體比未經(jīng)高溫回火的iHc明顯更高，但Br較低。而且無(wú)論磁體是否經(jīng)過(guò)高溫回火，T2從450升到600 ℃時(shí)，Br、最大磁能積(BH)m緩慢增大，iHc顯著提高，T2在600 ℃時(shí)磁性能達(dá)到最佳。磁體顯微組織分析表明：經(jīng)高溫900 ℃回火可使燒結(jié)態(tài)的磁體主相內(nèi)部大量分散的不均勻非晶相消失，而且使晶粒邊界變得清晰、均勻，能較好的抑制硬磁性相間交換耦合作用，磁體矯頑力大幅提高。

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    Effect of high temperature (T1) tempering on sintered NdFeB magnets was investigated. With increased T1 tempering of magnets, both Br and iHc are improved after low temperature T2 tempering at 600 oC, and optimum T1 is 900 oC. As T1 increases further, Br and iHc begin to decrease. Magnets experiencing T1 tempering own higher iHc but lower Br compared with magnets of free T1 tempering. Whether the magnets experience T1 tempering or not, both Br and (BH)m increase gradually while iHc increases greatly when low temperature T2 tempering increases. The optimum T2 is 600 oC. Microstructure analysis shows that there is a large amount of non-uniform phases in the main phase of sintered magnets, and they act as nuclear centers of reversal magnetism and result in iHc decreasing. After T1 tempering, the non-uniform phases disappear in the main phase and the grain boundary becomes clear and smooth, inhabiting the interaction between Nd2Fe14B grains. So the value of iHc for the tempered magnets is improved a lot.

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于濂清,張亞萍,鐘曉亮.高溫900 ℃回火在燒結(jié)NdFeB制備中的作用[J].稀有金屬材料與工程,2012,41(1):157~160.[Yu Lianqing, Zhang Yaping, Zhong Xiaoliang. Effect of High Temperature 900 oC Tempering on Magnetic Properties of NdFeB[J]. Rare Metal Materials and Engineering,2012,41(1):157~160.]
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  • 收稿日期:2011-01-27
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