Effect of infiltrated eutectic AlSi on the microstructure and properties of C/C composites
Effect of infiltrated eutectic AlSi on the microstructure and properties of C/C composites
复制标题
共晶AlSi对C/C复合材料组织与性能的影响
DOI：
10.1177/0021998320969794
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发表时间：
2020-10
影响因子：
2.9
通讯作者：
Yu Gao
中科院分区：
文献类型：
--
作者：
Lei Liu;Boyan Li;Yongchun Guo;Xiyuan Yao;Wei Yang;Wei Feng;Xingyu Chen;Xiaotian Wei;Yu Gao
采用压力浸渗法将Eu 3AlSi合金浸渗到多孔C/C骨架中，制备了一种低成本的新型C/C复合材料。制备了密度为1.7g/cm 3的C/C复合材料作为对比。主要研究了Al-Ti-C晶粒细化剂和Al-Ti-C晶粒细化剂填充AlSi对C/C复合材料组织和性能的影响。结果表明，AlSi的引入使C/C骨架相互渗透，使复合材料致密化。与C/C复合材料相比，其抗压强度和抗颗粒冲蚀性能有较大提高，而密度和热膨胀系数（CTE）略有增加。加入细化剂后，C/C-AlSi中以树枝状Al为中心的Si网络转变为细化的混合AlSi，Al块体和Si围绕树枝状Al，并产生两种微裂纹，导致C/C-AlSiR的强度降低，冲蚀磨损性能改善，热膨胀系数增大。改性C/C复合材料中的AlSi织构和微裂纹决定了裂纹的扩展，导致了它们不同的压缩行为和抗冲蚀能力。
Eutectic AlSi alloy was pressure infiltrated into a porous C/C skeleton to develop a low cost new C/C composite for application without extreme high temperature. C/C composite possessed a density of 1.7 g/cm3was prepared for comparison. The effects of filling AlSi with and without Al-Ti-C grain refiner on the microstructure and properties of C/C composites were mainly studied. Result indicated that the introduced AlSi interpenetrated with C/C skeleton and made the composites compact. In comparison with C/C composite, the compressive strength and particle erosion resistance were greatly enhanced while the density and thermal expansion coefficient (CTE) increased slightly. After adding the refiner, Si network involved dendritic Al in C/C-AlSi was transformed to refined mixed AlSi, Al bulk and Si surrounded dendritic Al, and two kinds of micro-cracks came into being, which resulted in the decreased strength, improved erosion property and increased CTE of C/C-AlSiR. Both AlSi textures and micro-cracks in the modified C/C composites determined the crack propagation and led to their different compressive behaviors and anti-erosion abilities.
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DOI：
10.1016/j.compositesb.2018.10.016
发表时间：
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期刊：
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影响因子：
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作者：
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