华南理工大学学报（自然科学版）2026，Vol.54Issue(5)：147-156,10.DOI:10.12141/j.issn.1000-565X.250384
SiC/Si-B-C复合材料的抗水氧腐蚀性能及行为
Water-Oxygen Corrosion Resistance and Behavior of SiC/Si-B-C Composite Materials
刘时剑 1李琼云 2徐昊 3陈义 3张冰玉 3陈明伟 3邱海鹏 3于倩倩 4王林格4
作者信息
- 1. 中国航空制造技术研究院 复合材料技术中心,北京 101300||华南理工大学 前沿软物质学院,广东 广州 510640
- 2. 中国航空工业集团公司 成都飞机设计研究所,四川 成都 610041
- 3. 中国航空制造技术研究院 复合材料技术中心,北京 101300
- 4. 华南理工大学 前沿软物质学院,广东 广州 510640
- 折叠
摘要
Abstract
SiC/Si-B-C composite materials,with their excellent properties including low density,high specific modulus and strength,high toughness,and oxidation resistance,have become highly promising key materials for hot-section components in aviation and aerospace propulsion system.High-temperature water-oxygen environments con-stitute their typical service conditions.This paper systematically investigates the performance evolution and da-mage mechanism of boron-modified 2.5D SiC/Si-B-C composites exposed to an extreme water-oxygen environment(90 kPa H₂O-10 kPa O₂)at 1100℃for corrosion durations of 50,100,150,200,250,and 300 hours.By analyzing the density,apparent porosity,room-temperature flexural properties and microstructure of the materials before and after corrosion,the following findings are obtained.In the initial corrosion stage(≤200 h),the material properties remain stable,with flexural strength retention exceeding 97%and a slight decrease in apparent porosity.Boron achieves dynamic self-healing through the formation of a borosilicate glass phase,effectively delaying the invasion of the oxidizing media.However,after long-term(300 h)corrosion,the material properties undergo significant degradation,with the flexural strength retention rate sharply dropping to 40%and apparent porosity increasing to 5.2%.The fiber pull-out length at the fracture surface is markedly reduced,presenting brittle fracture characteristics.Microscopic analysis reveals that the continuous volatilization of boron leads to matrix loosening and causes the surface CVD SiC coating to transform from a cauliflower-like structure into a molten glassy state with macroscopic cracks thereby losing its barrier function.This study reveals the possible performance degradation mechanism of boron-modified SiC/SiC composites in long-term extreme water-oxygen environments,providing a theoretical basis for their engineering applications关键词
SiC/Si-B-C复合材料/水氧腐蚀/自愈合/强度保留率/显气孔率Key words
SiC/Si-B-C composites/water-oxygen corrosion/self-healing/strength retention rate/apparent porosity分类
化学化工引用本文复制引用
刘时剑,李琼云,徐昊,陈义,张冰玉,陈明伟,邱海鹏,于倩倩,王林格..SiC/Si-B-C复合材料的抗水氧腐蚀性能及行为[J].华南理工大学学报（自然科学版）,2026,54(5):147-156,10.
