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Critical crack size of healing possibility of SiC ceramics

机译：SiC陶瓷修复的临界裂纹尺寸

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摘要

Crack-healing behavior of SiC ceramics with additive SiO_2 has been studied as functions of heat-treatment temperature and crack size. Results showed that heat treatment in air could significantly increase the strength. The heat-treatment temperature has a profound influence on the extent of crack healing and the degree of strength recovery. The optimum heat-treatment temperature had 1 h at an atmospheric level of 1373 K. After heat treatment at the optimum temperature in air, the crack morphology almost entirely disappeared and the strength recovered to the value of the smooth specimens at room temperature for the investigated crack sizes up to 450 μm. The long crack up to 1000 μm with width 1.4 μm could completely heal the surface crack.
机译：研究了添加SiO_2的SiC陶瓷的裂纹修复行为与热处理温度和裂纹尺寸的关系。结果表明，在空气中进行热处理可以显着提高强度。热处理温度对裂纹愈合的程度和强度恢复的程度有深远的影响。最佳热处理温度在1373 K的大气压下进行了1 h。在最佳温度下在空气中进行热处理后，裂纹形态几乎完全消失，强度恢复到室温下光滑试样的值。裂纹尺寸最大为450μm。长达1000μm，宽度为1.4μm的长裂纹可以完全治愈表面裂纹。

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