中文摘要：

以纳米TiO2粉和（O′＋β′）-SiMon粉为原料、Yb2O3或Tb2O3为添加剂，在高纯N2气氛下采用常压烧结制备出了TiO2／（O′＋β′）-Sialon复相陶瓷。采用XRD对材料进行物相、晶粒度分析，采用SEM＆EPMA对材料进行形貌观察和元素面分布分析。结果表明，随烧结温度的升高和恒温时间的延长，TiO2逐渐由锐钛矿相向金红石相转化，同时晶粒也逐渐长大。Tb2O3和Yb2O3分别对锐钛矿相变有显著的抑制和促进作用，通过控制烧结制度、添加剂种类及含量可得到不同TiO2相组成的TiO2／（O′＋β′）-Sialon。Tb2O3和Yb2O3均对TiO2晶粒生长有抑制作用，在不高于800℃的温度下烧结可得到纳米TiO2／（O′＋β′）-Sialon复相陶瓷。

英文摘要：

TiO2/（O′＋β′）-Sialon muhiphase ceramics were prepared by pressureless sintering under high-purity N2 atmosphere with （O′＋β′）-Sialon powder and nano TiO2 （anatase） powder as raw materials, Yb2O3 or Tb2O3 as additive. XRD was employed for the analysis of phase and grain size, and SEM＆EPMA for the characterization of the morphology and section-distribution of the elements. The results show that with the increase of sintering temperature and holding time, the phase transformation of anatase to rutile proceeds to a larger extent, which is companied with the grain growth of TiO2 . The added Tb2O3 and Yb2O3 significantly inhibits and promotes the phase transformation of anatase, respectively. As a result, TiO2/（O′＋β′）-Sialon with various phase composition of TiO2 can be obtained by adjusting sintering rule, additive and its content. Both the added Yb2O3 and Tb2O3 inhibit the grain growth of TiO2 and TiO2/（O′＋β′）-Sialon nano multiphase ceramics can be obtained when sintering temperature is not higher than 800℃ .