(燕山大学 材料科学与工程学院， 秦皇岛 066004)
摘 要: 在高温(1400℃)、 超高压(4.2 GPa)条件下制备了Al-ZrO2(Y2O3)-Si3N4烧结体。采用XRD分析及力学强度测试等方法， 研究了Al对ZrO2相变能力及ZrO2增韧烧结体作用的影响。结果表明：在烧结体中加入2%Al， 利用Al与N反应生成AlN可阻止Zr-O-N化合物生成，避免ZrO2在Si3N4基体中被N稳定生成不可相变t′-ZrO2，提高ZrO2的t→m相变能力， 使ZrO2起到增韧氮化硅烧结体的作用；当Y2O3含量为2%～2.5%(摩尔分数)时， 烧结体抗压强度及断裂韧性均较高， ZrO2相变增韧作用最大。
关键字: 铝； ZrO2； 增韧； Si3N4
（College of Materials Science and Technology, Yanshan University, Qinhuangdao 066004, P.R.China）
Abstract:Al-ZrO2Si3N4 composites were sintered at high temperature (1400℃) and ultrahigh pressure(4.2 GPa). The effects of Al on the t→m ZrO2 phase transformation and the toughness increment of sintered Si3N4 were investigated by XRD and mechanical tests. The results showed that 2%Al in the sintered material can prevent N from stabilizing ZrO2 to form t′-ZrO2 by producing AlN, both the potential of t→m phase transformation of ZrO2 and toughness of sintered Si3N4 are increased. ZrO2(Y2O3)-Si3N4 has a combination property of high compressive strength and high impact toughness when Y2O3 content is 2.0%～2.5%(mole fraction).
Key words: aluminum； ZrO2； toughness; Si3N4
