Micro-indentation method for evaluation of fracture toughness and thermal residual stresses of SiC coating on carbon/carbon composite
Micro-indentation method for evaluation of fracture toughness and thermal residual stresses of SiC coating on carbon/carbon composite
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碳/碳复合材料SiC涂层断裂韧性和热残余应力的微压痕法评价
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
T. Sugibayashi
中科院分区：
文献类型：
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作者：
H. Hatta;Masayuki Mizoguchi;M. Koyama;Yuko Furukawa;T. Sugibayashi
为了提高碳/碳复合材料的抗氧化性能，通常采用SiC涂层。这种防氧化涂层的厚度约为100 μm，因此涂层的性能可能与块体材料的性能不同。然而，用常规方法测定涂层的力学性能是相当困难的。采用显微压痕法测定了SiC涂层的断裂韧性和热残余应力。得出的结论是，断裂韧性可以评估，如果压痕载荷是足够低的，和热残余应力可以大致确定，虽然后者的分散是大的。
Carbon/carbon composites are frequently used with SiC coating so as to improve their oxidation resistance. This oxidation protection coating has a thickness of about 100 μm, so that the properties of the coating might be different from those of bulk materials. However, it is rather difficult to determine mechanical properties of coatings by the usual procedures. In the present paper, a microindentation method was adopted to determine the fracture toughness and thermal residual stresses of SiC coatings. It was concluded that fracture toughness can be evaluated if the indentation load is sufficiently low, and thermal residual stress can be roughly determined, though scattering of the latter was large.