中文摘要：

在粉末叠层基础上于1550℃,保温30 min的微波烧结条件下,合成了以β-Sialon为过渡层,Si3N4和Al2O3为端元组分的梯度材料。SEM分析显示烧结试样表面气孔少,晶粒之间排列紧密,结构均匀;XRD分析表明由于组分之间的固溶反应,梯度材料中β-Sialon相的z值在1~3范围内呈现规律性变化。各烧结试样的体积密度在2.9~3.5 g/cm3之间,相对密度在90%~96%之间,热膨胀系数随着成份的变化而呈现出从Al2O3端到Si3N4端呈逐渐下降的趋势。

英文摘要：

The Si3N4-Al2O3functionally graded materials with β-Sialon as transient were synthesized by microwave sintering method at 1500 ℃ for 30 min.The SEM images show the sample was sintered densely,with homogeneous structure and less surface porosity.XRD patterns show that the z values of β-Sialons are in the range of 1 to 3,due to the solid solution reaction during the sintering period.The densities and relative densities of sintered samples distribute from 2.9 g/cm3to 3.5 g/cm3,90% to96%,respectively.The coefficient of thermal expansion of the samples decreased gradually from Al2O3side to Si3N4side.