以纳米锐钛矿型TiO2粉和(O'+β')-Sialon粉为原料制备出了TiO2/(O'+β')-Sialon复相陶瓷, 研究了Yb2O3添加剂对材料中锐钛矿型TiO2相变的影响, 对其影响机制进行了探讨. 采用XRD对材料进行物相组成和晶格参数表征. 结果表明, Yb2O3对锐钛矿相变开始温度无明显影响, 但对相变有显著的促进作用, 随添加量的增加, 其作用逐渐减弱. 添加的Yb2O3同时以两种形式存在: 一部分进入TiO2晶格, 一部分堆积在TiO2晶粒表面. Ybn+进入TiO2晶格置换Ti4+和Yb3+与TiO2发生氧化还原反应促进相变, 而存在于TiO2表面的Yb3+与TiO2相互作用形成Ti-O-Yb键而抑制相变. Yb2O3对锐钛矿相变的影响是这两方面机制共同作用的结果.
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