Tribological properties of polyimide coatings filled with PTFE and surface‐modified nano‐Si3N4
Tribological properties of polyimide coatings filled with PTFE and surface‐modified nano‐Si3N4
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DOI：
10.1002/app.40410
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发表时间：
2014-06
影响因子：
3
通讯作者：
Fenghua Su;Shaohua Zhang
中科院分区：
文献类型：
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作者：
Fenghua Su;Shaohua Zhang
采用喷涂和连续固化工艺制备了PTFE和纳米Si 3 N4填充聚酰亚胺（PI）涂层。通过接枝3-氨丙基三乙氧基硅烷对纳米氮化硅进行改性，以提高其在涂料中的分散性。研究了涂层的摩擦磨损性能和磨损机理。结果表明，PTFE和改性纳米Si 3 N4颗粒的加入大大提高了PI涂层的减摩性和耐磨性。填料质量分数和滑动条件对复合涂层的摩擦磨损性能有显著影响。在PI涂层中加入20wt%PTFE和5wt%改性纳米Si_3N_4，涂层的摩擦学性能最好。其磨损率比未填充PI涂层低一个数量级以上，摩擦系数比未填充PI涂层小两倍以上。复合涂层的摩擦磨损性能随填料和滑动条件的变化而不同，其原因在于填料的分散性、在摩擦副表面形成的转移膜的特性以及涂层在不同滑动条件下的磨损机理。© 2014 Wiley Periodicals，Inc. J.应用聚合物Sci. 2014，131，40410。
Polyimide (PI) coatings filled with PTFE and nano-Si3N4 were prepared by a spraying technique and successive curing. Nano-Si3N4 particles were modified by grafting 3-aminopropyltriethoxysilane to improve their dispersion in the as-prepared coatings. Friction and wear performances and wear mechanisms of the coatings were evaluated. The results show that the incorporations of PTFE and modified nano-Si3N4 particles greatly improve the friction reduction and wear resistance of PI coating. The friction and wear performance of the composite coating is significantly affected by the filler mass fraction and sliding conditions. PI coating incorporated with 20 wt % PTFE and 5 wt % modified nano-Si3N4 displays the best tribological properties. Its wear rate is more than one order of magnitude lower and its friction coefficient is over two times smaller than that of the unfilled PI coating. Differences in the friction and wear behaviors of the hybrid coatings as a function of filler or sliding condition are attributed to the filler dispersion, the characteristic of transfer film formed on the counterpart ball and the wear mechanism of the coating under different sliding conditions. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40410.