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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‐Si...
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