液相烧结氧化铝和氧化钇稳定四方氧化锆复相材料的显微结构与力学性能

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF COMPOSITES OF ALUMINA AND YTTRIA- STABILIZED TETRAGONAL ZIRCONIA PREPARED BY LIQUID PHASE SINTERING

以TiO2,MnO2及CaOAl2O3SiO2玻璃为烧结助剂,利用液相烧结法制备了氧化铝和3%氧化钇稳定四方氧化锆复相材料。研究了烧结助剂对材料致密化、显微结构及力学性能的影响。结果表明:除TiO2可与ZrO2晶粒形成部分固溶外,烧结助剂主要以晶间玻璃相的形式存在,并影响了Y2O3在ZrO2晶粒中的分布。烧结助剂的引入显著促进材料的致密化,降低了烧结温度,使材料具有细晶结构,因而具有良好的力学性能。

Composites of Al2O3 and 3% (in mole) yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) were prepared by liquid phase sintering with the addition of TiO2-MnO2 and CaO-Al2O3-SiO2 glass as sintering flux. The effects of sintering flux on the densification, microstructure and mechanical properties of the composites were investigated. It is found that apart from partial solid solution of TiO2 into the ZrO2 grains the additives are existed mainly as grain boundary glass phase, which affects the distribution of Y2O3 in ZrO2 grains. The densification of the composites is greatly improved by the additives. Meanwhile the sintering temperature is obviously decreased, resulted in obtaining fine grain structure and excellent mechanical properties of composites.