Effect of pyrocarbon content on thermal and frictional properties in C/C preforms of C/C–SiC composites
Effect of pyrocarbon content on thermal and frictional properties in C/C preforms of C/C–SiC composites
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DOI：
10.1016/j.wear.2010.03.017
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发表时间：
2010-05
期刊：
影响因子：
5
通讯作者：
Y. H. Zhang;Z. Xiao;Jiping Wang;R. Xing;Z. Peng;J. Su;Z. Jin
中科院分区：
文献类型：
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作者：
Y. H. Zhang;Z. Xiao;Jiping Wang;R. Xing;Z. Peng;J. Su;Z. Jin
本文研究了C/C-SiC复合材料中SiC、Si和热解碳相组成的改变对材料热性能和摩擦性能的影响，并探讨了相关的机理。为此，采用化学气相浸渗结合液态硅浸渗工艺制备了4种纤维体积相同、相含量不同的C/C-SiC复合材料，并对其进行了结构和热性能表征，在相同条件下进行了盘对盘摩擦磨损试验。结果表明，C/C-SiC复合材料的组成和相含量对材料的导热性能、磨损机理和磨损率有重要影响。C/C-SiC复合材料的横向导热系数随热解碳含量的增加而增加，随陶瓷含量的减少而增加。摩擦系数随着SiC和Si含量的增加而增加。随着Si含量的增加，磨损机制由磨粒磨损转变为粘着磨损。
This paper concerns the influence of the phase composition (SiC, Si, and pyrocarbon) modification in the C/C–SiC composite on the thermal and friction behavior, and the related mechanisms. For this purpose, four different C/C–SiC composites with the same fiber volume but different phase contents were prepared by chemical vapor infiltration, combining with liquid silicon infiltration process, and these samples were submitted to structural and thermal characterization, then to friction and wear tests using a disk-on-disk configuration at the same condition. As a result, the composition and phase content of the C/C–SiC composites play an important role in varying thermal conductivity, wear mechanism and wear rate. The C/C–SiC composite with higher pyrocarbon content and less ceramic content showed higher transverse thermal conductivity. The friction coefficients increased with increasing SiC and Si content. The wear mechanism changed from an abrasive action to an adhesive action with increasing the Si content.