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Effects of Pyc shell thickness on the microstructure,ablation resistance of sicnws/Pyc-c/c-zrc-sic composites

Journal of Materials Science & Technology 2021年第12期71卷 55-66页

作者： Qinchuan He Hejun Li Xuemin Yin Jinhua Lu college of Materials and chemistry&chemical Engineering Chengdu University of TechnologyChengdu 610059China carbon/carbon composites Research center Northwestern Polytechnical UniversityXi’an710072China

sic nanowires/pyrocarbon(sicnws/Pyc)core-shell structure toughenedc/c-zrc-sic composites were fabricated by cLVD process,and the influences of Pyc shell thickness on the microstructure and ablation resistance of the composites were *** results presented that sicnws/Pyc core-shell structure had a linear shape,and the composites became dense with the increasing Pyc *** the thickness of Pyc shell increased from 0 to 2.4μm,the density and thermal conductivity of the composites was improved gradually,but the coefficient of thermal expansion(cTE)decreased firstly and then *** the ablation test for 90 s,the ablation rates of the composites decreased continuously as the Pyc thickness increased from 0 to 1.4μm,but increased when the Pyc thickness was up to 2.4μ*** when the Pyc thickness was 1.4μm,the linear and mass ablation rates of the composites were 71.25%and 63.01%lower than those of the composites without Pyc *** reasons behind the remarkable improvement of anti-ablation property were that the proper Pyc thickness could alleviate the cTE mismatch to promote the formation of complete oxide coating,improve the thermal conductivity to reduce heat corrosion and enhance the capability to limit the mechanical erosion.

关键词： sicnws/Pyc core-shell structure c/c-zrc-sic composites Microstructure Ablation resistance cLVD

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