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采用自蔓延高温还原合成方法制备了TiB2和TiB2-A l2O3陶瓷粉末。利用XRD、XPS、SEM以及TEM等分析测试手段对合成粉末进行表征和分析。结果表明,TiB2和A l2O3分别以主晶相的形式存在于所合成的各自粉体之中。相比之下,TiB2单相陶瓷粉末颗粒分布较宽。由于SHS温度很高,部分颗粒形成团聚,宏观上使颗粒的平均粒径变大(>5μm);而TiB2-A l2O3复合陶瓷粉末,因合成过程中A l2O3的形成,使得颗粒粒度分布明显变窄,分布均匀,颗粒尺寸也相应减小。这可能主要与复合粉末合成过程中不同颗粒间形成良好结合的界面有关。
TiB2 and TiB2-Al2O3 ceramic powders were prepared by self-propagating high temperature reduction synthesis. The synthesized powders were characterized and analyzed by means of XRD, XPS, SEM and TEM. The results show that TiB2 and Al203 exist in the form of the main crystalline phase in the synthesized powders respectively. In contrast, TiB2 single-phase ceramic powder particles wide distribution. Due to the high temperature of SHS, part of the particles formed agglomeration, macroscopically increased the average particle size of the particles (> 5μm). However, the particle size distribution of TiB2-Al203 ceramic powder was obviously changed due to the formation of Al 2 O 3 during the synthesis Narrow, evenly distributed, the particle size is also reduced accordingly. This may be mainly related to the formation of a well-bonded interface between different particles during the composite powder synthesis process.