将立方氮化硼(cBN)微粉和铝(Al)微粉按照体积比7:3的比例进行混配,在高温(1300～1500℃)、高压(5.5GPa)条件下进行烧结.利用X射线衍射分析(XRD)、透射电子显微镜(TEM)以及X射线色散能谱(EDS)对烧结体的物相构成、显微结构以及各组分元素的分布进行了分析.实验结果表明,1300℃,Al尚未与cBN反应;当温度升至1400℃时,Al与cBN反应生成AlN和AlB2;温度进一步升高至1500℃,反应产物增多,产物种类不变.TEM和EDS分析表明,在反应过程中Al扩散进入cBN的表层,B扩散进入富Al的区域,生成新相AlN和AlB2.
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