新型炭材料Issue(4)：372-376,377,6.
预炭层对ZrC浸渍C/C复合材料微观结构和力学性能的影响
Influence of a pre-coated pyrocarbon layer on the microstructure and mechanical properties of ZrC-doped C/C composites
摘要
Abstract
A carbon fiber preform was pre-coated with a carbon layer ( PyC) with different thicknesses by chemical vapor infiltra-tion ( CVI) , then impregnated with a ZrOCl2 ethanol solution, carbonized at 1 800℃ to form ZrC, densified by CVI to a density of 1. 75 g/cm3 and graphitized at 2 300℃ to obtain ZrC-doped C/C composites. The microstructure and composition of the composites were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The mechanical properties were studied by three-point bend tests. The influence of the PyC layer on the microstructure, ZrC distribution and mechanical prop-erties was investigated. Results show that the average flexural strength is 256. 85 MPa when the thickness of PyC layer is 1. 5-1. 7μm, , which is a 67. 01% increase compared with the sample without the PyC layer. The cross sections of the composites after flex-ural failure show a brittle-fracture mode. The ablation resistance of the composites was slightly improved as a result of the PyC lay-er.关键词
预炭层/ZrC/C/C复合材料/力学性能Key words
Pre-coated carbon layer/ZrC/C/C composites/Mechanical properties分类
化学化工引用本文复制引用
李贺军,陶珺,姚栋嘉,付前刚,李克智..预炭层对ZrC浸渍C/C复合材料微观结构和力学性能的影响[J].新型炭材料,2015,(4):372-376,377,6.基金项目
国家自然科学基金(51221001) （51221001）
国防基础科研计划(A2720110008) （A2720110008）
“111”计划(08040).@@@@National Natural Science Foundation of China (51221001) （08040）
Defense Idustrial Technology Development Program (A2720110008) （A2720110008）
“111” Project (08040) （08040）
