Enhancing anti-oxidation and thermal-radiation performance of the repaired borosilicate glass coating on C/C composites by Sm-doping  

作　　者：Han-Hui Wang Liu Teng Jing-An Kong Xue-Song Liu Xiao-Hong Shi He-Jun Li 

机构地区：[1]State Key Laboratory of Solidification Processing,Carbon/Carbon Composites Research Center,Northwestern Polytechnical University,Xi'an,Shaanxi,710072,China

出　　处：《Journal of Materiomics》2022年第2期417-426,共10页无机材料学学报（英文）

基　　金：This work has been supported by National Natural Science Foundations of China(grant numbers:51772247,51727804,91860203);Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory(grant number:JCKYS2019607002).

摘　　要：To repair the damaged SiC coated C/C composites,a double-layer system including a Sm-doped boro-silicate glass external layer and a SieSiC inner layer was prepared by a slurry-based laser cladding technique.Isothermal oxidation experiment and indirect/direct thermal-radiation measurements were performed.The results showed that the absorbance of borosilicate glass to the laser at 900e1200 nm was improved significantly by Sm-doping.Consequently,the repaired coating with a more compact structure and better oxidation resistance was obtained.After oxidation at 1773 K for 10 h,the mass loss of the damaged sample could be reduced by 74.98%with repairing.By increasing laser-absorption and reducing viscosity,the thermal-radiation property of the repaired coating was enhanced to decrease the surface temperature greatly.A repair system with excellent thermal protection performance was achieved.

关 键 词：Coating repair Laser cladding Rare earth Oxidation resistance Thermal radiation 

分 类 号：TG1[金属学及工艺—金属学]