氧化石墨烯增强碳纤维磷酸盐粘结陶瓷涂层在不同温度下的摩擦学性能

Tribological Properties of Graphene Oxide Reinforced Carbon Fiber Phosphate Bonded Ceramic Coating at Different Temperatures

为提高碳纤维(CF)在磷酸盐粘结陶瓷涂层(PBCC)中的界面性能,从而提升高温下PBCC的耐磨损性能,采用电泳沉积法将氧化石墨烯(GO)片材附着到碳纤维(CF)表面,制备出CF-GO杂化纤维,研究未添加和添加CF-GO杂化纤维的PBCC在不同温度下的摩擦学行为。利用扫描电镜(SEM)和拉曼光谱表征CF-GO样品的表面形貌和结构。利用SEM、摩擦磨损试验机和光学轮廓仪对未添加和添加CF-GO杂化纤维的PBCC在不同温度下的摩擦学性能进行表征。结果表明:随着温度从25℃升至100℃,未添加和添加2%(质量分数)CF-GO杂化纤维的PBCC的摩擦系数均随温度的升高而升高,并且添加杂化纤维的涂层的摩擦系数波动值明显低于未添加杂化纤维的涂层;添加2%CF-GO杂化纤维的PBCC的摩擦系数在不同温度下均小于未添加杂化纤维的PBCC,由此可知,杂化纤维的引入有效降低了涂层的摩擦系数以及当摩擦工况的温度升高时摩擦系数的波动值,提高了涂层的摩擦学性能的稳定性;常温下添加CF-GO杂化纤维的PBCC的磨损量高,高温下未添加CF-GO杂化纤维的PBCC的磨损量高,由此可知,CF-GO杂化纤维的加入在常温下使涂层磨痕两边隆起的高度降低,并降低了涂层的耐磨性,而在高温下使涂层磨痕两边隆起的高度提高,改善了涂层的耐磨性。

To improve the interfacial performance of carbon fiber(CF)in phosphate bonded ceramic coating(PBCC)and enhance the wear resistance of PBCC at high temperature,electrophoretic deposition method was used to attach graphene oxide(GO)sheets to the surface of CF to prepare CF-GO hybrid fiber.The tribological behavior of PBCC with and without CF-GO hybrid fiber was studied at different temperatures.The surface morphology and structure of CF-GO samples were characterized by scanning electron microscopy(SEM)and Raman spectroscopy.The tribological properties of PBCC without and without CF-GO hybrid fibers at different temperatures were characterized by SEM,friction and wear tester and optical profilometer.Results showed that the friction coefficients of the coatings with and without 2%(mass fraction,the same below)CF-GO hybrid fiber increased with the increase of the ambient temperature from 25℃to 100℃,and the friction coefficient fluctuation value of the coating with hybrid fibers added was significantly lower than that of the coating without hybrid fibers added.The friction coefficient of PBCC with 2%CF-GO hybrid fiber added was lower than that of PBCC without hybrid fiber added at different temperatures.Therefore,it could be concluded that the addition of hybrid fiber effectively reduced the friction coefficient of the coating and the fluctuation value of the co-efficient when the temperature of the friction condition increased,and improved stability of the tribological properties of the coating.The phos-phate bonded ceramic coating with CF-GO hybrid fiber added at room temperature had a high wear rate,and PBCC without CF-GO hybrid fiber added at high temperature also had a high wear rate.From this,it could be seen that the addition of CF-GO hybrid fiber reduced the height of protrusions on both sides of coating wear marks at room temperature and reduced the wear resistance of the coating,while at high temperature,it increased the height of protrusions on both sides of coating wear marks and improved the wear resistance of the coating.