摘要
碳/碳(C/C)复合材料在370℃以上易氧化,这限制了其在航空航天及军事领域的进一步应用。因此,提高C/C复合材料的耐烧蚀性能尤为重要。本研究以柠檬酸、乙二醇和金属盐溶液为前驱体,采用前驱体浸渍裂解工艺(PIP)和陶瓷化工艺制备了密度为2.00~2.10 g/cm^(3)的C/C-Hf_(x)Zr_(1-x)C复合材料。研究了不同Hf/Zr比例对C/C-Hf_(x)Zr_(1-x)C复合材料耐烧蚀性能的影响。结果表明,Hf_(x)Zr_(1-x)C是一种固溶体陶瓷。随着Hf比例的增加,烧蚀率先减小后增大,其中C/CHf_(0.5)Zr_(0.5)C的耐烧蚀性能最佳,在3.5 MW/m^(2)热流密度下烧蚀120 s时,C/C-Hf_(0.5)Zr_(0.5)C的质量烧蚀率和线烧蚀率分别为1.39×10^(-2)g/s和7.49×10^(-3)mm/s。因为C/C-Hf_(0.5)Zr_(0.5)C的氧化产物HfO_(2)-ZrO_(2)对纤维和基体的附着力较强,可以减少纤维和基体受到的机械剥蚀,同时HfO_(2)-ZrO_(2)混合物的熔点较低,有利于形成HfO_(2)-ZrO_(2)的熔融混合物,从而降低氧化层的透氧性。
Carbon/carbon(C/C)composites are prone to oxidation above 370℃,which restricts their further utilization in aerospace and military applications.Hence,enhancing the ablation resistance of C/C composites holds paramount significance.This research utilized citric acid,ethylene glycol,and metal salt solutions as precursors to fabricate C/C-Hf_(x)Zr_(1-x)C composite materials with a density ranging from 2.00 g/cm^(3)to 2.10 g/cm^(3)employing the precursor impregnation and pyrolysis(PIP)and ceramicization.The effect of different Hf/Zr ratios on the ablation resistance of C/C-Hf_(x)Zr_(1-x)C composites is investigated.The results indicate that Hf_(x)Zr_(1-x)C manifests as a solid solution ceramic.With the increase in Hf proportion,the ablation rate of C/C-Hf_(x)Zr_(1-x)C composites first decreases and then increases.Among them,C/CHf_(0.5)Zr_(0.5)C shows superior ablation resistance.When ablated for 120 s at a heat flux density of 3.5 MW/m^(2),the mass ablation rate and linear ablation rate of C/C-Hf_(0.5)Zr_(0.5)C are 1.39×10^(-2)g/s and 7.49×10^(-3)mm/s,respectively.This superiority can be attributed to the strong adhesion of the oxidation product HfO_(2)-ZrO_(2)to the fiber and matrix in C/C-Hf_(0.5)Zr_(0.5)C,thereby mitigating mechanical erosion on the fiber and matrix.Simultaneously,the lower melting point of the HfO_(2)-ZrO_(2)mixture facilitates the formation of a molten mixture of HfO_(2)-ZrO_(2),consequently reducing the oxygen permeability of the oxide layer.
作者
赵旭宁
李红
易黎明
李梅
杨敏
姚彧敏
任慕苏
孙晋良
ZHAO Xuning;LI Hong;YI Liming;LI Mei;YANG Min;YAO Yumin;REN Musu;SUN Jinliang(Research Center of Composite Materials,School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Inner Mongolia Power Machinery Research Institute,Hohhot 010011,China)
出处
《材料工程》
北大核心
2025年第6期227-234,共8页
Journal of Materials Engineering
基金
上海市教育发展基金会和上海市教育委员会“曙光计划”项目(18SG34)。
