SiC/MoSi2-SiC-Si Oxidation Protective Coatings for HTR Graphite Spheres with Residual Si Optimized

Materials

卷:15

Ziqiang Li¹  Hui Yang¹  Xiaoyu Wei¹  Yuan Gao¹  Hongsheng Zhao¹  Kaihong Zhang¹  Bing Liu¹  Xiaoxue Liu¹ 

[1] Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China;

关键词: anti-oxidation;    C/SiC;    MoSi₂;    coating;    nuclear graphite;   

DOI  :  10.3390/ma15093203

来源: DOAJ

【 摘 要 】

SiC/MoSi₂-SiC-Si coatings for nuclear graphite spheres with different Si-Mo ratios were prepared through two-step pack cementation. XRD, SEM and EDS techniques were used to analyze the composition and microstructure of the coatings. The oxidation resistance performance of the composites at 1773 K, in static air, was investigated. The results showed that the SiC-MoSi₂-Si coating could be divided into a denser inner layer and a loose outer layer, as free Si would infiltrate into the inner micropores of the coating under capillary force. When the Si/Mo ratio of the second pack cementation was 7:1, the thickness of the denser inner layer basically reached the maximum and exhibited excellent oxidation resistance ability, with a weight gain of 0.19% after 200 h oxidation. The performance improvement was analyzed as a result of the addition of SiC and C powder in the pack cementation process, effectively increasing the phase interfaces to relax the thermal stress in the coating. With different Si-Mo ratios, the content of residual Si and the formation rate of SiO₂ glass layer on the coating surface were also different, thus affecting the anti-oxidation performance. The main reactions occurring at different stages of the oxidation curve were also discussed.

【 授权许可】

Unknown