Microstructure and ablation properties of a gradient Cf/C-XSi2-SiC (X = Mo,Ti) composite fabricated by reactive melt infiltration
Microstructure and ablation properties of a gradient Cf/C-XSi2-SiC (X = Mo,Ti) composite fabricated by reactive melt infiltration
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DOI：
10.1016/j.jeurceramsoc.2016.04.006
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发表时间：
2016-11
影响因子：
5.7
通讯作者：
Z. Hao;Wei Sun;X. Xiong;Z. Chen;Yalei Wang;Yabin Chang;Yonglong Xu
中科院分区：
文献类型：
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作者：
Z. Hao;Wei Sun;X. Xiong;Z. Chen;Yalei Wang;Yabin Chang;Yonglong Xu
在1600 °C以下，用不同Ti含量的Si-Mo-Ti混合粉末对多孔炭/炭复合材料进行熔渗，制备了抗烧蚀Cf/C-（Mo，Ti）Si 2-SiC复合材料。研究了渗透复合材料的显微组织、力学性能和烧蚀性能。结果表明，Ti含量为14%wt的混合粉末浸渗复合材料具有致密的梯度结构和良好的力学性能。根据MoSiTi固溶体的分布情况，可以将渗透复合材料的表面分为三种不同的典型形貌。分析了三种典型形貌的形成机理。陶瓷相的致密性和连续性是复合材料耐烧蚀性能提高的主要原因。由于在烧蚀过程中形成的I型和III型形貌的保护性氧化层，14%wt Ti渗透的复合材料具有最好的耐烧蚀性。该复合材料的线烧蚀率和质量烧蚀率分别为0.002mm/s和0.01mg/s。
Porous carbon/carbon composites were infiltrated by mixed Si-Mo-Ti powder with different Ti content below 1600 °C to produce an ablative Cf/C-(Mo,Ti)Si2-SiC composite. Microstructure, mechanical properties and ablation properties of the infiltrated composites were investigated. Results show that composites infiltrated by mixed powders with 14%wt Ti content have dense gradient structure and good mechanical properties. Three different kinds of typical morphologies can be distinguished on the surface of infiltrated composites according to the distribution of MoSiTi solid solutions. Formation mechanisms of the three kinds of typical morphologies are also analyzed. Ablation resistance improvement is attributed to the dense and continuity ceramic phases which distribute from inside to surface of the composites. Composites infiltrated with 14%wt Ti have the best ablation resistance due to the protective oxide layer formed by type I and type III morphologies during the ablation process. Linear and mass ablation rates of such composites are 0.002 mm/s and 0.01 mg/s, respectively.