无机材料学报2025，Vol.40Issue(10)：1153-1162,10.DOI:10.15541/jim20240493
SiCp掺杂Cf/Li2O-Al2O3-SiO2复合材料耐烧蚀性能研究
Ablative Properties of SiCp Doped Cf/Li2O-Al2O3-SiO2 Composites
摘要
Abstract
In a high heat flux ablative environment,the surface temperature of aircraft rises rapidly,leading to traditional high thermal conductivity materials being ineffective at protecting internal metal components.In this study,continuous carbon fiber reinforced Li2O-Al2O3-SiO2(Cf/LAS)glass ceramic composites doped with SiC particles(SiCp)were prepared by slurry immersion winding and hot pressing sintering.Effect of matrix crystallinity on ablative properties of the composites under ultra-high heat flux was investigated.By utilizing heat absorption and low thermal conductivity characteristics associated with SiO2 gasification within composite materials,both surface and internal temperatures of these materials are effectively reduced,thereby ensuring the safe operation of aircraft and electronic devices.Results indicate that the average linear ablation rate of composites doped with 10％(in mass)of SiCp significantly decreases at a heat flux of 20 MW/m2.Transmission electron microscope observation reveals that the doped glass matrix exhibits increased crystallinity,reduced internal stress,and minimized lattice distortion,thereby enhancing the composites' high-temperature performance.However,excessive SiCp doping leads to reduced crystallinity and deteriorated ablation performance.Ultimately,the average linear ablation rate of Cf/LAS composites with 10％(in mass)SiCp at 20 MW/m2 heat flux is comparable to that of commercial carbon/carbon composites,accompanied by providing lower thermal conductivity and higher bending strength.This novel high-performance Cf/LAS composite is cost-effective,short-cycled,and suitable for mass production,offering promising potential for widespread application in ablation-resistant components of hypersonic vehicles.关键词
耐烧蚀Cf/LAS复合材料/SiC掺杂/玻璃基体结晶度/长程有序Key words
ablation-resistant Cf/LAS composite/SiC doping/crystallinity of glass matrix/long-range ordered引用本文复制引用
林元伟,景昭,陈鹤拓,李佳恒,覃显鹏,周国红,王士维..SiCp掺杂Cf/Li2O-Al2O3-SiO2复合材料耐烧蚀性能研究[J].无机材料学报,2025,40(10):1153-1162,10.基金项目
National Natural Science Foundation of China(U23A6014,52103357) （U23A6014,52103357）
