纳米SiC颗粒复合对Al_2O_3-ZrO_2陶瓷材料力学性能的影响  

EFFECTS OF SiC NANO-PARTICLES ADDITION ON MECHANICAL PROPERTIES OF Al_2O_3-ZrO_2 COMPOSITES

作　　者：郭小龙[1] 陈沙鸥[1] 戚凭[1] 潘秀宏[1] 

机构地区：[1]青岛大学物理系,山东青岛266071

出　　处：《青岛大学学报（自然科学版）》2003年第3期32-36,共5页Journal of Qingdao University(Natural Science Edition)

基　　金：国家自然科学基金项目(59872046);山东省自然科学基金项目(Y2000F08)

摘　　要：研究了纳米SiC颗粒复合对Al2O3＿ZrO2陶瓷材料力学性能影响的两个因素,即ZrO2的相变强韧化和纳米SiC颗粒的弥散强韧化。实验发现,处于晶界的纳米SiC颗粒,有松弛晶界应力的作用,使得样品中在室温下保留的四方相含量减少,ZrO2的相变强韧化作用减小,但纳米SiC颗粒在晶界处对裂纹的钉扎作用又改善了材料的力学性能。如果两个因素能协调作用,将会使强韧化效果增大,反之则会降低。This paper investigated the effects of SiC nanoparticles composited into Al2O3ZrO2 ceramics on the strengthening and toughening in the two aspects of the stress induced transformation of ZrO2 and the particle dispersive of SiC. The results indicated the stress of grain boundary is relaxed due to the SiC particle existing and the function of stress induced transformation of ZrO2 is reduced as a result of decreasing for reserved tetragonal phase in the matrix with the increasing of SiC volume fraction.The nailing effect of SiC nanoparticle on flows improved the mechanical properties of composites. The better performances can be obtained with the matching of these two aspects mentioned above.

关 键 词：Al2O3-ZrO2陶瓷材料 力学性能 纳米SIC颗粒 相变强韧化 弥散强韧化 氧化铝 氧化锆 复合材料 

分 类 号：TB333[一般工业技术—材料科学与工程] TB383