CAJ | 학술논문

　　为了提高炭/炭(C/C)复合材料的抗氧化性能，采用包埋与低压化学气相沉积相结合的方法在 C/C 复合材料表面制备双层SiC涂层。利用SEM、XRD和EDS观察与分析涂层的微观形貌和相组成；测试涂层试样在1773 K高温下的抗氧化性能。结果表明：双层SiC涂层可以在1773 K的高温下有效地保护C/C复合材料178 h，质量损失仅为1.25%。试样经受16次1773 K至室温急冷急热循环后，氧化质量损失仅为2.74%。C/C复合材料表面双层SiC涂层的结构致密、成分均匀，具有较强的抗氧化性能。
　　위료제고탄/탄(C/C)복합재료적항양화성능，채용포매여저압화학기상침적상결합적방법재 C/C 복합재료표면제비쌍층SiC도층。이용SEM、XRD화EDS관찰여분석도층적미관형모화상조성；측시도층시양재1773 K고온하적항양화성능。결과표명：쌍층SiC도층가이재1773 K적고온하유효지보호C/C복합재료178 h，질량손실부위1.25%。시양경수16차1773 K지실온급랭급열순배후，양화질량손실부위2.74%。C/C복합재료표면쌍층SiC도층적결구치밀、성분균균，구유교강적항양화성능。
To improve the oxidation resistance of C/C composites, a double SiC protective coating was prepared by a two-step technique. Firstly, the inner SiC layer was prepared by a pack cementation technique, and then an outer uniform and compact SiC coating was obtained by low pressure chemical vapor deposition. The microstructures and phase compositions of the coatings were characterized by SEM, EDS and XRD analyses. Oxidation behaviour of the SiC coated C/C composites was also investigated. It was found that the double SiC coating could protect C/C composites against oxidation at 1773 K in air for 178 h with a mass loss of 1.25%. The coated samples also underwent thermal shocks between 1773 K and room temperature 16 times. The mass loss of the coated C/C composites was only 2.74%. Double SiC layer structures were uniform and dense, and can suppress the generation of thermal stresses, facilitating an excellent anti-oxidation coating.