PIP和RMI法制备SiC/SiC复合材料水氧侵蚀机理研究OA
Wet-oxidation Mechanism of SiC/SiC Composites Prepared by PIP and RMI Routes
SiC/SiC 复合材料具有高韧性、热稳定性以及抗氧化性能等,是航空发动机热端部件的理想候选材料.然而,高温水氧侵蚀对 SiC/SiC 复合材料的工程化应用提出了严峻挑战,揭示 SiC/SiC 复合材料在服役条件下的微观结构演变和性能衰退机制是预测航空发动机使用寿命的关键.基于此,本研究采用先驱体浸渍裂解(PIP)和反应熔渗(RMI)两种液相法制备SiC/SiC复合材料,借助原位水氧拉曼表征手段,系统研究了SiC/SiC复合材料高温水氧环境下的退化行为.结果表明:PIP-SiC/SiC 基体中残留碳在 700～1100℃发生氧化并以气态产物形式逸出,导致基体内部形成微孔及通道等结构缺陷,水氧介质迅速抵达纤维和界面区域,促使 BN 界面相在 700℃发生氧化侵蚀;1000℃时,SiC 纤维因持续氧化作用而出现表面结构损伤;1100℃时,界面相载荷传递能力下降进一步造成PIP-SiC/SiC 弯曲性能降低.相比之下,RMI-SiC/SiC 基体中残留硅和 SiC 发生氧化形成熔融 SiO2,在一定程度上减缓了水氧侵蚀,其 BN 界面相的氧化起始温度为 900℃,且 SiC 纤维结构保持完整;1100℃时,SiO2、B2O3 等氧化产物的填充作用提升了基体强度和界面结合力,确保载荷从基体有效传递至纤维,因而RMI-SiC/SiC经高温水氧侵蚀后的弯曲性能更稳定.本研究为陶瓷基复合材料的结构调控和性能优化提供了新的表征手段和理论思路.
SiC/SiC composites,renowned for their high toughness,thermal stability and oxidation resistance,become ideal candidate materials for hot-section components in aeroengines.However,high-temperature steam environments pose significant challenges to their practical application.Investigating the microstructural evolution and performance degradation mechanisms of SiC/SiC is crucial for predicting the service life of aeroengine.Here,SiC/SiC composites were fabricated using two liquid-phase methods:precursor infiltration and pyrolysis(PIP)and reactive melt infiltration(RMI).The oxidation behavior of SiC/SiC under high-temperature wet-oxygen conditions was evaluated comprehensively by in-situ wet-oxygen Raman and conventional characterization.The results indicated that residual carbon in PIP-SiC/SiC matrix was oxidized and volatilized as gaseous products between 700 and 1100℃,generating structural defects such as micropores and channels in SiC matrix.Thus,the wet-oxygen corrosive gases rapidly diffused to the fiber and interphase regions,leading to the oxidation and erosion of BN interphase at 700℃.At 1000℃,continuous oxidation caused significant surface structural damage to SiC fibers.With the temperature rising to 1100℃,the load-transfer capability of BN interphase was degraded,which can weaken the flexural properties of PIP-SiC/SiC.In contrast,the residual silicon and SiC in RMI-SiC/SiC matrix were oxidized to form molten SiO2,which can hinder wet-oxygen corrosion.The onset temperature of BN interphase oxidation was increased to 900℃,preserving the structural integrity of SiC fibers.At 1100℃,the filling effect of oxidation products,including SiO2 and B2O3 can improve SiC matrix strength and interfacial bonding,ensuring efficient load transfer from the matrix to fibers.Consequently,RMI-SiC/SiC exhibits more stable flexural performance in high temperature wet-oxygen environments.This study provides innovative characterization and performance optimization strategies for the structural design of ceramic matrix composites.
郭斐宇;沙建军;陈小武;程国峰;董绍明
苏州国家实验室 结构材料研究部,苏州 215123苏州国家实验室 结构材料研究部,苏州 215123中国科学院 上海硅酸盐研究所,关键陶瓷材料全国重点实验室,上海 200050中国科学院 上海硅酸盐研究所,无机材料分析测试中心,上海 200050中国科学院 上海硅酸盐研究所,关键陶瓷材料全国重点实验室,上海 200050
通用工业技术
SiC/SiC原位拉曼液相法水氧侵蚀弯曲性能
SiC/SiCin-situ Ramanliquid phase routewet-oxidationflexural property
《无机材料学报》 2026 (9)
1273-1284,12
中国博士后科学基金资助项目(2025M773340)China Postdoctoral Science Foundation(2025M773340)
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