Si_3N_4/BN纤维独石陶瓷阻力曲线的研究  

R-curve Behavior for Si_3N_4 /BN Fibrous Monolithic Ceramic

作　　者：李淑琴[1] 黄勇[1] 汪长安[1] 邢增平[1] 关振铎[1] 

机构地区：[1]清华大学材料科学与工程系,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《材料工程》2001年第1期7-9,共3页Journal of Materials Engineering

摘　　要：通过压痕小裂纹直接测量法获得 Si3N4/BN纤维独石陶瓷的阻力曲线 ,采用指数经验公式拟合了实验数据 ,对纤维独石陶瓷阻力曲线具有的独特的阶梯状进行分析 ,并对纤维独石陶瓷具有高韧性的机理作了研究通过压痕小裂纹直接测量法获得 Si3N4/ BN纤维独石陶瓷的阻力曲线 ,采用指数经验公式拟合了实验数据 ,对纤维独石陶瓷阻力曲线具有的独特的阶梯状进行分析 。WT5BZ]R curves for Si 3N 4/BN fibrous monolithic ceramic were established by direct measurement of the change of Vickers indentation cracks in length under progressively applied bending stresses. The fracture behavior of the Si 3N 4/BN fibrous monolithic ceramic was studied. An empirical exponential relation was fitted for the data. The unique steplike shape whiich was possessed of the R curve of fibrous monolithic ceramic was discussed. Moreover, the mechanism of high fracture toughness of fibrous monolithic ceramic was further explained.

关 键 词：阻力曲线 纤维独石陶瓷 弱胞界面层 裂纹偏转 氮化硅 氮化硼 压痕小裂纹 

分 类 号：TQ174.758[化学工程—陶瓷工业] TQ174.1[化学工程—硅酸盐工业]