无机材料学报2026，Vol.41Issue(3)：331-339,9.DOI:10.15541/jim20250258
氧化铝纤维增强二氧化硅复合材料力学性能失效研究
Mechanical Property Failure of Alumina Fiber Reinforced Silica Composite
郑晨 1王湘宁 2苑贺楠 1杨嘉伟 1李传建 3王华栋1
作者信息
- 1. 航天特种材料及工艺技术研究所,北京 100074
- 2. 某部驻北京地区某代表室,北京 100074
- 3. 北京化工大学数理学院,北京 100029
- 折叠
摘要
Abstract
Continuous alumina fiber-reinforced silica ceramic matrix composites exhibit excellent properties,such as high-temperature oxidation resistance,high strength and high toughness.As a dual-use material for both military and civilian applications,they hold broad prospects in numerous fields,including aviation,aerospace and energy.However,domestic research currently still remains on its initial stage and is characterized by a primarily qualitative understanding of their mechanical property failure mechanisms.In this study,an improved liquid-phase impregnation method,which integrated the process characteristics of the Sol-Gel method and slurry impregnation method,was adopted to prepare continuous alumina fiber-reinforced silica composites with tunable porosity.Microstructure and composition of the typical composite were comprehensively characterized using different techniques.Mechanical properties of these composites with different densification degrees were tested and analyzed.By integrating porosity data obtained from computed tomography(CT)test with simulation calculation,a relationship model linking mechanical property failure of the composites to porosity and pore size parameters was established.The results indicated that composites prepared via the improved liquid-phase impregnation method had significantly enhanced mechanical properties due to the presence of pore defects and weak interfacial bonding.Notably,as the composite porosity increased from 2.2%to 15.2%,the tensile strength decreased from 24.5 MPa to 17.8 MPa.Further modeling and simulation analysis revealed that,at a pore defect radius of 250 μm,an increase in porosity from 4.5%to 13.5%led to a corresponding reduction in tensile strength from 27.2 MPa to 20.6 MPa,thereby validating rationality of the simulation model.The law that the n-th power of tensile strength shows a negative linear correlation with porosity,and the tensile strength exponent factor n is negatively linearly correlated with the pore defect radius r.These findings provide a research basis for the performance optimization and practical application of continuous alumina fiber-reinforced silica composites.关键词
氧化铝纤维/二氧化硅复合材料/力学性能/孔隙率/孔隙缺陷尺寸/性能失效Key words
alumina fiber/silica composite/mechanical property/porosity/pore defect size/failure分类
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郑晨,王湘宁,苑贺楠,杨嘉伟,李传建,王华栋..氧化铝纤维增强二氧化硅复合材料力学性能失效研究[J].无机材料学报,2026,41(3):331-339,9.
