本文主要研究了在Ｎｄ－Ｆｅ－Ｂ烧结磁体晶界上添加ＷＣ对显微组织和磁性能的影响实验结果表明，添加少量ＷＣ时，随ＷＣ含量的增加，晶粒逐渐变细，矫顽力也逐渐升高，并且在０．６％处晶粒最细，而矫顽力则出现峰值。进一步增加ＷＣ的含量，晶粒又开始粗化，并伴随着矫顽力的下降。扫描电镜的观察显示，加ＷＣ的磁体中主相晶界和晶界附近的主相晶内出现了一些杆状相．能谱分析表明，该相为Ｗ－Ｆｅ－Ｂ相，在此化合物附近区域和晶界处的Ｃ和Ｗ含量高于其它基体区域．
The coercivity of sintered Nd-Fe-B magnets is enhanced by the addition of a small amount of WC and the highest one corresponds to an amount of 0.6% WC addition. But a higher amount of WC addition leads to the decrease in coercivity. The grain size decreases first and then increases with increasing the WC content. SEM observation revealed that W-Fe-B phase with colony-like shape appears at grain boundaries or in some matrix regions, and that the contents of C and W in the regions near to W-Fe-B phase are higher than other regions. Correspondent: SONG Xiaoping,(College of Materials Science, Xi'an Jiaotong University, Xi'an 710049)
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