关键词: Al2O3/ZrO2复合材料;Y2O3;烧结性能;高温抗折强度;抗热震性

Abstract: Effects of Y2O3 contents on sintering behavior and thermo-mechanical properties (hot modulus of rupture (HMOR) and thermal shock resistance (TSR)) of Al2O3/ZrO2 composites, as well as their relationships with phase composition and microstructure have been investigated.It is found that Y2O3 not only stabilizes the tetragonal phase of ZrO2, but also promotes the sintering behavior and increases HMOR and TSR of Al2O3/ZrO2 composites.When Y2O3 addition is up to 1%, the sample shows excellent sintering behavior and has higer HMOR, values of bulk density, apparent porosity and shrinkage ratio are 3.27 g/cm3, 21.95% and 7.43%, respectively, and the value of HMOR is 29 MPa.While the TSR exhibits excellent performance when Y2O3 addition reaches 0.5%, the residual strength ratio is 71%.These changes have close relationships with the formation of Y2O3/ZrO2 solid solution, degree of contact between Al2O3 and ZrO2 crystals, microcrack contents in samples.

Key words: Al2O3/ZrO2 composite;Y2O3;sintering behavior;hot modulus of rupture;thermal shock resistance