ZrO_2对Cr_2O_3-Al_2O_3陶瓷增韧的影响  

Influences of ZrO_2 on Toughness of Cr_2O_3-Al_2O_3 Ceramics System

作　　者：宋国敬 戚凭[1] 孟涛[1] 

机构地区：[1]青岛大学物理科学学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2007年第4期50-54,共5页Journal of Qingdao University(Natural Science Edition)

摘　　要：为了研究ZrO2对Cr2O3-Al2O3复合陶瓷的增韧性能,利用WES-100型电液伺服万能试验机研究了ZrO2在Cr2O3-Al2O3陶瓷中的烧结行为以及热处理制度对材料力学性能的影响;并用XRD和SEM分析了陶瓷的韧性与晶体结构及显微组织之间的关系。结果表明,随着ZrO2质量分数的增加,Cr2O3-Al2O3陶瓷的烧结温度降低,烧成的陶瓷的致密度提高。ZrO2晶内的(Cr0.6Al0.4)2O3晶粒能产生巨大的热压应力,阻止裂纹扩散,产生明显的增韧效果。In order to study the effect of chromium oxide on Cr2O3-Al2O3 mechanical properties of composite ceramic powders, different ZrO2 mass fractions and heat-treatment procedures on the sintering behavior were investigated by WES-100, and phase structure and morphology of the sinteren samples were characterized by X-ray diffraction, scanning electron microscope, respectively. The results show that the sintering temperature for the ceramic decreased with the increase of the ZrO2 mass fraction. It could be attributed to the penetration of ZrO2 into Cr2O3-Al2O3 solid solution, which increased the number of vacancy, accelerated the material diffusion and then facilitated sintering. And the （Cr0.6 Al0.4）2O3 crystal wrapped by ZrO2 could induce great thermal compressive stress, which could inhibit the fracture propagation and improve the material fracture toughness.

关 键 词：氧化铬 氧化锆 固溶体 增韧 压应力 

分 类 号：O346.1[理学—固体力学]