ZrO2纳微米纤维自增韧Al2O3陶瓷力学测试与断裂分析  

Mechanical Test and Fracture Analyses on ZrO2 Nano-micron Fibers Self-toughening Al2O3 Matrix Ceramics

作　　者：董颖 [1] 刘景江 [2] 李彤华 [2] 纪中华 [2] 王永刚 [2] 

机构地区：[1]军械工程学院导弹工程系,河北,石家庄,050003 [2]白城兵器试验中心弹药试验站,吉林,白城,137001

出　　处：《军械工程学院学报》2005年第6期71-74,共4页Journal of Ordnance Engineering College

摘　　要：通过对原位生长ZrO2纳微米纤维自增韧Al2O3基陶瓷的三点弯曲、单边切口梁与Vickers压痕测试,发现陶瓷硬度、弯曲强度与断裂韧性在ZrO2质量分数为35%时出现极大值.经SEM观察与XRD分析,发现裂纹扩展主要受含ZrO2纳微米纤维的α-Al2O3基棒晶控制,诱发裂纹偏转增韧机制,并伴随着相变增韧机制.Based on three - point bending test, single - edge - notched beam test and Vickers test, it is found that ceramic hardness, flexural strength and fracture toughness measured the maximum values, respectively, as mass fraction of ZrO2 is 35%. SEM and XRD results show that crack propagation is mainly controlled by rod - shaped crystals with ZrO2 nano - micron monocrystal fibers, and deflection - induced toughening is initiated, followed by transformation- induced toughening.

关 键 词：Al2O3/ZrO2陶瓷 纳料微米纤维 原位生长 裂纹 增韧 

分 类 号：TB39[一般工业技术—材料科学与工程] TB383