%0 Journal Article
%T Effects of Vickers Cracks on the Mechanical Properties of Solid-phase-sintered Silicon Carbide Ceramics
%A YANG Xiao
%A LIU Xue-Jian
%A HUANG Zheng-Ren
%A LIU Gui-Ling
%A YAO Xiu-Min
%J 无机材料学报
%D 2012
%I Science Press
%R 10.3724/sp.j.1077.2012.11650
%X In order to study the effects of Vickers cracks on the mechanical properties of solid-phase-sintered silicon carbide (SSiC for short) ceramics, the indentation cracks and the crack profiles were observed after loading 0.1–100 N loads on the SSiC samples by SEM. The critical indentation load for Vickers crack initiation in SSiC ceramics lies between 0.1 N and 0.2 N. Indentations by loads lower than 0.5 N have limited influence on bending strength. And if the indentation loads is higher than 10 N, the obtained hardness floats around 24.2 GPa and the cracks are half-coin type. The proper Vickers indentation load range for SSiC ceramic hardness and toughness tests are determined to be 10 N or above.
%K <p>silicon carbide ceramic
%K indentation load
%K mechanical properties</p>
%U http://www.jim.org.cn/fileup/PDF/20120913.pdf