Si3N4/BN纤维独石陶瓷阻力曲线的研究

材料工程, 2001, 1(1): 7-9. doi: 10.3969/j.issn.1001-4381.2001.01.002

Si3N4/BN纤维独石陶瓷阻力曲线的研究

李淑琴 ^1, , 黄勇 ^2, , 汪长安 ^3, , 邢增平 ^4, , 关振铎 ^5,

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

2.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

3.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

4.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

5.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

关键词：阻力曲线 , 纤维独石陶瓷 , 弱胞界面层 , 裂纹偏转

R-curve Behavior for Si3N4 /BN Fibrous Monolithic Ceramic

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。

R-curves for Si3N4/BN fibrous monolithic ceramic were establishedby direct measurement of the change of Vickers indentation cracks in length under progressively applied bending stresses． The fracture behavior of the Si3N4/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．

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