空气动力学学报2025，Vol.43Issue(7)：73-82,10.DOI:10.7638/kqdlxxb-2025.0104
碳化硅/二硼化锆超高温陶瓷抗氧化特性建模
Modeling of oxidation resistance characteristics of silicon carbide/zirconium diboride ultra-high temperature ceramics
周述光 1李睿智 1刘骁 1国义军1
作者信息
- 1. 中国空气动力研究与发展中心计算空气动力研究所,绵阳 621000
- 折叠
摘要
Abstract
Silicon carbide/zirconium diboride(SiC-ZrB2)ultra-high temperature ceramics(UHTCs)are commonly employed for sharp components of hypersonic vehicles under extreme thermal environments to maintain geometric configuration.The key mechanism lies in the formation of a dense solid-liquid mixed oxide scale(with pores filled by borosilicate glass)during high-temperature oxidation,which effectively impedes oxygen diffusion and achieves near-zero/minimal ablation.Based on oxygen diffusion mechanisms in porous oxides and thermochemical equilibrium principles,a criterion for SiC depletion layer formation was proposed,establishing a dual-model system accounting for both presence and absence of depletion layers.For cases with depletion layers,the model couples CO/CO2 convective diffusion,ZrO2 solid layer growth,and the competitive mechanisms of B2O3-SiO2 glass layer evaporation/growth to quantify virgin material recession and weight gain.For cases without depletion layers,recession equations for substrate interfaces and critical composition conditions were derived.Numerical calculations identified that optimal oxidation resistance occurs at 20-30 vol%SiC content,where oxide products exhibit maximum density.Model validation conducted in static air environments at 1473,1573,and 1773 K demonstrated good agreement between calculated oxidation weight gain curves and experimental data,confirming the model's capability to accurately simulate the influence of SiC content variations on oxidation behavior.This model effectively simulates the oxidation behavior of SiC-ZrB2 ceramics and provides critical evaluation criteria for oxidation resistance in material optimization design.关键词
高速飞行器/热防护/超高温陶瓷/抗烧蚀/氧化膜Key words
high-speed aircraft/thermal protection/ultra-high temperature ceramics/ablation resistance/oxide scale分类
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周述光,李睿智,刘骁,国义军..碳化硅/二硼化锆超高温陶瓷抗氧化特性建模[J].空气动力学学报,2025,43(7):73-82,10.
