A simple recoating repair methodology to improve oxidation resistance of C/SiCS

作者：Mei, Hui^*; Zhang, Ding; Xia, Junchao; Cheng, Laifei

来源：Advances in Applied Ceramics, 2018, 117(6): 347-353.

DOI：10.1080/17436753.2018.1434954

• C/SiCs composites
• recoating repair methodology
• oxidation resistance
• mechanical property

Lots of through SiC coating micro-cracks appeared due to the mismatch of thermal expansion coefficient between fibres and matrix, and this could be the diffusion path for oxidising gases to reduce oxidation resistance of as-cracked C/SiCs, In this paper, a simple recoating repair methodology was achieved by grinding off original coating and depositing coating again. The experimental results pointed out that as-repaired specimens had excellent oxidation resistance with the whole temperature range of 500-1500 degrees C, and at sensitive point of 800 degrees C, the weight loss rate of the as-repaired specimens was decreased by 22.1% compared to the as-cracked specimens. From 700 to 1100 degrees C, the flexural strength of the as-repaired specimens has obviously improved compared to the as-cracked specimens, Microstructural analysis showed that the recoating repair methodology can seal and narrow through-coating micro-cracks, leading to oxidation resistance and mechanical properties improvement for the as-repaired specimens.

• 出版日期2018
• 单位西北工业大学