摘要
通过电阻缝焊法,使用超硬铁基合金粉末(SHA)和2种粒度(3.5和55μm)的WC粉末在Al7075板表面制备了铁基WC/金属双层涂层。采用SEM和EPMA等手段对双层涂层的显微组织进行了分析;采用纳米压痕仪对双层涂层中微小组织进行了纳米硬度测试;最后通过球盘摩擦(ball-on-disc)实验对比了WC和SUS304 2种磨球对双层涂层的摩擦磨损行为的影响。结果表明,该铁基WC/金属双层涂层的总厚度达600μm,从涂层到基体的结构依次为:WC粉末/铁合金(耐磨层)+铁基/铝合金(金属中间层)+铝合金基体。当以WC为磨球时,使用微细和粗大WC粉末的涂层,其磨损机制分别为严重的磨粒磨损和脆性断裂伴随少量磨粒磨损;当以SUS304为磨球时,使用微细WC的涂层基本未发生磨损,而粗大WC粉末的涂层则发生少量磨粒磨损。以SUS304为磨球时,涂层的磨损率均低于以WC为磨球时涂层的磨损率。
Fe-WC/metal double layer coatings containing Fe-C-Si super hard alloy(SHA) particles and tungsten carbide(WC) particles were fabricated on Al7075 substrates by resistance seam welding method to improve the wear resistance of aluminum alloys. The micro-structure and phase compositions of the Fe-WC/metal double layer coatings with different WC particle sizes(fine and coarse) were investigated by SEM and EPMA. Nano-hardness of different phases in the coatings were investigated by nano-indentation test. Finally, the friction behavior of the two kinds of Fe-WC/metal double layer coatings were contrasted by ball-on-disc test using WC and SUS304 balls. The results show that the thicknesses of Fe-WC composite/metal double layer coatings were about 600 μm. The microstructure of the coatings was: WC/Fe composite(wear resistance layer) + Fe/Al composite(metal interlayer) + Al7075 substrate. When WC ball was used as the static counterpart, the wear mechanism of the coatings with fine and coarse WC particles were severe abrasive wear and brittle fracture with little abrasive wear, respectively. When SUS304 was used as the static counterpart, the coating with fine WC powder was demonstrated difficulty to be abraded due to the protection of the iron oxide adhesive layer, and the other proved a little brittle fracture. Moreover,the wear rate of both coatings using SUS304 ball was lower than that of WC ball in the ball-on-disc test.
引文
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