现代技术陶瓷2025，Vol.46Issue(6)：580-593,14.DOI:10.16253/j.cnki.37-1226/tq.2025.06.005
浆料烧结法制备C/SiC抗氧化涂层及正交实验研究
Study on Method for Orthogonal Experiment and Process of the Coatings of C/SiC Composites by Fused Slurry Method
摘要
Abstract
C/SiC composites are regarded as ideal candidate materials for aerospace hot-section components due to their excellent high-temperature properties.However,carbon fibers undergo rapid oxidation in environments above 400 ℃,which severely limits their service temperature.Therefore,improving the high-temperature oxidation resistance of C/SiC composites is of significant practical importance for promoting their engineering application in aerospace thermal systems.Based on coating system design principles,this study selected ZrB2 as the main component of the coating,with SiC and B incorporated to enhance oxidation resistance.The coating was prepared through a two-step process of low-temperature curing and high-temperature sintering,resulting in a ZrB2-SiC composite coating.Orthogonal experimental design was employed to investigate the effect of composition ratio on coating performance and to optimize the coating formulation.The composition and microstructure of the coating were characterized by XRD and SEM,and the oxidation resistance of the coated composites was evaluated.The results indicate that the coating applied on the C/SiC composite consists of ZrB2 and SiC,with a thickness of approximately 200 μm.It is uniform and dense,without obvious through-thickness cracks.The content of SiC has the most significant influence on the oxidation weight loss rate and the interfacial bonding strength between the coating and the composite.The optimized composition was determined as follows:60wt.％ZrB2,4wt.％SiC,6wt.％PCS,4wt.％B,and 26wt.％DVB.The interfacial bonding strength between the coating and the substrate reached 2.01 MPa.The coated C/SiC composite exhibited an oxidation weight loss rate of only 0.54％and a strength retention rate of 97.3％.Under high-temperature oxidizing conditions,SiC reacts with oxygen to form a SiO2 protective layer.Compared to B2O3,SiO2 exhibits higher viscosity,higher melting point,lower oxygen diffusion coefficient,and lower vapor pressure,resulting in superior oxidation resistance.The combined action of the SiO2 and ZrO2 layers effectively inhibits oxygen inward diffusion,preventing further oxidation of the material and significantly improving the overall oxidation resistance of the composite.At 1200 ℃,SiO2 can react with B2O3 to form borosilicate glass,which enhances the density and adhesion strength of the coating.The developed coating system demonstrates excellent anti-oxidation performance.关键词
C/SiC复合材料/涂层/浆料烧结法/正交实验法/抗氧化Key words
C/SiC composites/coatings/fused slurry method/orthogonal experiment/anti-oxidation分类
通用工业技术引用本文复制引用
蒋斌智,向阳,彭志航,文瑾,刘平,李海龙,杨帆..浆料烧结法制备C/SiC抗氧化涂层及正交实验研究[J].现代技术陶瓷,2025,46(6):580-593,14.基金项目
湖南省自然基金项目(2023JJ50486) （2023JJ50486）
重点实验室基金项目(6142907230401) （6142907230401）
娄底市"材料谷"科技重大专项项目 （）
精细陶瓷与粉体材料湖南省重点实验室开放基金项目. （）
