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表面涂覆对碳纤维镁基复合材料组织与性能的影响
Effect of Surface Coating on Microstructure and Properties of Carbon Fiber Magnesium Matrix Composites
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- DOI:
- 作者:
- 李是捷 1 ，周海涛 2 ，应 韬 1 ，肖 旅 2 ，曾小勤 1
LI Shijie1 , ZHOU Haitao2 , YING Tao1 , XIAO Lyu2 , ZENG Xiaoqin1
- 作者单位:
- 1. 上海交通大学 材料科学与工程学院，上海 200240；2. 上海航天精密机械研究所，上海 201600
1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China
- 关键词:
- 碳纤维；溶胶凝胶；镁基复合材料；润湿性；力学性能
carbon fiber; sol-gel; magnesium composite; wettability; mechanical property
- 摘要:
- 通过溶胶凝胶法在短切碳纤维表面涂覆了 MgO、SiO2、TiO2 涂层，分析了各涂层对碳纤维润湿性能的影响，
制备了镁基复合材料，研究了碳纤维表面涂覆对镁基复合材料组织和性能的影响规律。 结果表明，MgO 涂层表面较为
粗糙，存在团聚的 MgO 颗粒，SiO2、TiO2 涂层表面较为光洁，沿碳纤维径向连续分布，具有良好的仿形性。 而且 3 种涂层
的存在均可显著改善碳纤维的润湿性，润湿角由未涂覆时的 120°降低到 90°以下，其中 MgO 涂层的润湿角仅为 42°。 采
用涂覆后的碳纤维分别制备了镁基复合材料，其中 TiO2 涂覆后的复合材料强度最高，SiO2 次之，MgO 最低。 这是由润
湿性和界面反应共同作用导致的。
MgO, SiO2, and TiO2 coatings were applied to the surface of chopped carbon fiber by sol-gel method, and the influence of each coating on the wettability of carbon fiber was analyzed. The coated carbon fiber reinforced magnesium composites were prepared, and the effect of surface coating on the microstructure and properties of the composites was investigated. The results show that the surface of MgO coating is rough and there are agglomerated MgO particles. The surface of SiO2 and TiO2 coating is smooth and continuously distributed along the radial direction of carbon fiber, which has good profile property. Moreover, the presence of three kinds of coatings can significantly improve the wettability of carbon fiber. The wetting angle of the MgO coating decreased from 120° to less than 90°, and the wetting angle of the MgO coating is only 42°. The coated carbon fibers are used to prepare magnesium matrix composites, and the composite strength of TiO2 is the highest, followed by SiO2 and MgO. This is caused by a combination of wettability and interfacial reaction.