摘要:
在重要航空材料TA15钛合金基材表面进行激光同轴送粉熔覆Ni60A-Ni包WC-TiB2-Y2O3混合粉末可生成非晶-纳米晶增强复合涂层.对涂层进行微观组织观察、显微硬度测试及室温干摩擦磨损试验.结果表明,涂层主要由γ-(Fe,Ni),WC,α-W2C,M12C,Ti-B化合物,Ti-Al金属间化合物,Mo,Zr与V元素的碳化物以及非晶相构成.整个涂层为非晶、纳米晶及其它晶化相共存.涂层较TA15钛合金表现出更好的耐磨损性,且涂层的主要磨损机制为磨粒磨损与粘着磨损.纳米晶颗粒的产生可使涂层磨损表面光滑,有利于摩擦系数与磨损量的降低.
Abstract:
Coaxial powder feeding laser cladding of the Ni60A-Ni coated WC-TiB2-Y2O3 mixed powders on the aviation material TA15 titanium alloy substrate can form an amorphousnanocrystals reinforced composite coating. Such coating was researched by means of the microstructure observation, the microhardness test and the dry friction and wear test at room temperature. Investigation indicated that the such coating mainly consisted of γ-(Fe, Ni), WC, α-W2C, M12C, Ti-B compounds, Ti-Al intermetallics, amorphous phases and the Mo, Zr, V carbides.Amorphous, nanocrystalline and the other crystalline phases were existence in such coating. This coating also exhibited a better wear resistance than TA15 titanium alloy, and abrasive grain wear mechanism and the adhere wear mechanism did the process at the same time during the dry sliding wear process. The productions of the nanocrystals made the worn surface more smooth, favoring the decrease of the coefficient of friction and the wear volume losses.
百度学术
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