SiCn/SiC Multilayer Oxidation Protective Coatings for C/C Composites Prepared by a Hydrothermal Electrophoretic Deposition Process
Source abstract
Abstract
采用水热电泳沉积法在SiC—C／C复合材料表面制备纳米碳化硅（SiCn）涂层．采用XRD和SEM对涂层的晶相组成、表面和断面的微观结构进行了表征．主要研究了水热沉积温度对涂层的结构及高温抗氧化性能的影响，并分析了涂层试样在1600℃的高温氧化气氛下失效行为．结果表明：纳米碳化硅涂层主要由B—SiC组成．涂层的致密程度和厚度随着水热沉积温度的升高而提高．随着水热温度的提高，涂层试样的抗氧化性能也有明显的提高．在120℃水热沉积温度下制备的涂层试样可在空气气氛1500℃下有效保护C／C复合材料202h，而氧化失重仅为2．16×10^-3g／cm^2．在1600℃下氧化64h后失重为3．7×10^-3g／cm^2．其高温失效是由于长时间的氧化挥发后表面SiO2膜不能完全封填表面缺陷，内涂层中产生了贯穿性的孔隙所致．
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Research context
OpenAlex topics: Advanced ceramic materials synthesis · TiO2 Photocatalysis and Solar Cells · Bone Tissue Engineering Materials
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References (9)
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