分别采用纳米气相氧化铝(F-Al₂O₃,平均粒径13nm)和纳米球形氧化铝(Q-Al₂O₃,平均粒径100nm)与环氧-聚酯粉末涂料熔融挤出复合,经静电涂装的方式制备环氧-聚酯纳米复合耐磨涂层。在多功能摩擦实验机上对不同填充量的两种纳米氧化铝颗粒复合涂层进行耐磨性测试,采用电子扫描显微镜观察纳米氧化铝颗粒在涂层中的分散情况,采用激光共聚焦扫描显微镜观察磨损面的形貌,并对涂层的表面粗糙度、光泽度进行测量。结果表明:F-Al₂O₃两种氧化铝颗粒都可改善涂层的耐磨性能,在相同填充量的情况下,F-Al₂O₃复合涂层的比磨损速率都低于Q-Al₂O₃体系。F-Al₂O₃颗粒质量含量为10%时,磨损速率变为纯树酯涂层磨损量的1/3;Q-Al₂O₃颗粒质量含量为30%时,磨损速率变为纯环氧-聚酯涂层的1/52。两者的颗粒都增加了涂层的表面粗糙度,F-Al₂O₃对涂层表面光泽度无影响,Q-Al₂O₃含量越高,表面粗糙度提高,光泽度下降。

Two kinds of aluminum nanoparticles,i.e.fumed aluminum with average particle size of 13nm and spherical aluminum with average particle size of 100nm produced by high frequency thermal plasma,were applied to improve the wear resistant of epoxy-polyester powder coatings.Epoxy-polyester hybrid powder coatings were prepared with fumed and spherical aluminum nanoparticles respectively by melting mixing through twin screw extruder and the coating were deposited on steel substrates by electrostatic spraying and then cured at 160℃ for 15min.The morphology and wear resistance of the two kind of coatings were systematically investigated.The sliding wear resistance behavior was evaluated using a universal micro-tribological(UMT) tester under certain conditions.The worn surfaces were examined by confocal laser scanning microscopy.The surface roughness and glossiness of the coating were also measured.The results showed that both F-Al₂O₃ and Q-Al₂O₃ particles all can improve the wear resistance.The specific wear rate of F-Al₂O₃ was lower than that of Q-Al₂O₃ system at the same filling amount.When the content of F-Al₂O₃ particles was 10wt%,the wear rate decreased to 1/3 of the wear rate of epoxy-polyester coating.However,when the content of Q-Al₂O₃ particles was 30wt%,the wear rate decreased to 1/52 of epoxy-polyester coating.Besides,both F-Al₂O₃ and Q-Al₂O₃ particles increased the surface roughness of the coating.F-Al₂O₃ had no effect on the glossiness of the coating.The higher the content of Q-Al₂O₃,the higher the surface roughness,the lower the glossiness.