Effect of thermal stress induced by femtosecond laser on fracture toughness of fine-grained alumina

被引:6
|
作者
Zhao, W. [1 ,2 ]
Cui, J. P. [2 ]
Rao, P. G. [2 ]
机构
[1] Shangluo Univ, Sch Chem Engn & Modern Mat, Shangluo 72600, Peoples R China
[2] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China
关键词
Alumina; Fracture toughness; SEVNB; Laser processing; Thermal stress; ZIRCONIA CERAMICS; SI3N4;
D O I
10.1007/s41779-018-0264-6
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The ultra-sharp V-notch with tip radius smaller than 0.5m was cut by femtosecond laser on the fine-grained alumina ceramic bars to measure the fracture toughness by single-edge V-notched beam (SEVNB) method. In order to relieve the effect of thermal stresses induced by laser on fracture toughness testing, the samples with V-notch were annealed before measurement. The morphologies of the notch tip were analyzed by SEM and micro-Raman spectra. Results reveal that the fracture toughness value of this fine-grained alumina with thermal stresses on the V-notch is equal to that after annealing, and the effect of thermal stresses induced by laser on the fracture toughness can be ignored.
引用
收藏
页码:575 / 578
页数:4
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