[目的]环氧树脂(EP)复合材料虽有良好的力学性能和化学稳定性,但脆性大、摩擦因数高、耐磨性差,使其难以满足运动摩擦部件的性能要求.[方法]通过向EP基体中添加改性纳米TiO2 和玻璃鳞片(GF)制备了TiO2/GF/EP复合材料,研究了纳米 TiO2 添加量对复合涂层性能的影响.采用扫描电子显微镜(SEM)和傅里叶变换红外光谱仪(FT-IR)对涂层的断面形貌和分子结构进行了表征.[结果]利用KH-550 硅烷偶联剂对纳米TiO2 进行改性处理消耗了其表面大量的羟基,有效减少了纳米TiO2的团聚.GF和改性纳米TiO2与EP基体的界面相容性良好,TiO2/GF/EP复合涂层的致密性与纯EP涂层相比明显提高.对于添加了相对于 EP 质量 4%的纳米 TiO2 和 30%的 GF 的复合涂层,其显微硬度比纯 EP 提高了46.8%,摩擦因数和磨损后的质量损失分别比纯EP减小了46.1%和52.0%.[结论]改性纳米TiO2和GF共同作为填料加入,可使EP的显微硬度和耐磨性得到明显提高,摩擦因数明显减小,综合性能得到提升.
Study on wear resistance of epoxy resin enhanced by titania nanoparticle and glass flake
[Introduction]Although the epoxy resin(EP)based composites have good mechanical properties and chemical stability,their high brittleness,high friction factor,and poor wear resistance make them difficult to meet the property requirements of frictional moving components.[Method]TiO2/GF/EP composites were prepared by adding modified TiO2 nanoparticles and glass flakes(GF)to the EP matrix.The effect of the dosage of TiO2 nanoparticles on the properties of the composite coating was studied.The facture morphology and molecular structure of the coating were characterized by scanning electron microscopy(SEM)and Fourier-transform infrared spectroscopy(FT-IR).[Result]The modification by silane coupling agent KH-550 consumed a large amount of hydroxyl groups on the surface of TiO2 nanoparticle,effectively reducing the agglomeration of TiO2 nanoparticles.The interface compatibility between GF,modified TiO2 nanoparticle,and EP matrix was good.The compactness of TiO2/GF/EP composite coating was greatly improved as compared with the pure EP coating.The microhardness of the EP-based composite coating prepared by adding TiO2 4%and GF 30%with respect to the mass of EP was increased by 46.8%as compared with the pure EP coating,while its friction factor and wear loss were decreased by 46.1%and 52.0%,respectively.[Conclusion]The dosage of modified TiO2 nanoparticles and GF as fillers can greatly improve the microhardness and wear resistance of EP and reduce the friction factor of EP,improving its overall performance.
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