目的 分别研究90°、180 s冲蚀条件下TC4表面纳米化前处理对涂层的冲蚀性能和磨损特性。方法 先对TC4基材进行表面机械研磨（SMAT）纳米化处理,后采用多弧离子镀技术（MIP,Multi-arc Ion Plating）在TC4基材上分别沉积TiN和TiAlN涂层,探究纳米化前处理工艺对涂层性能的影响。结果 通过纳米压痕仪对TiN、TiAlN涂层的硬度进行表征,分别为32.53、39.5 GPa。利用摩擦磨损试验机对涂层的磨损性能进行了对比研究,纳米化后磨损率由10‒5 mm3/(N·m)级提升至10‒6 mm3/(N·m)。基于自主研制的砂粒冲蚀实验平台,系统评估了TiN与TiAlN涂层的耐冲蚀性能。SEM形貌分析表明,2种涂层的冲蚀损伤机制与抗冲蚀性存在显著差异。进一步研究发现,表面纳米化前处理能有效改善涂层的力学性能。结论 经纳米化前处理的TiAlN涂层,其界面结构能有效抑制冲蚀裂纹的萌生与扩展,从而表现出最优异的抗冲蚀性能。
Abstract
The work aims to study the effect of surface nanocrystallization pretreatment of TC4 substrate on the erosion resistance and wear behavior of the coatings under a normal impact angle (90°) for a duration of 180 s. Following surface mechanical attrition treatment (SMAT) for nanocrystallization of the TC4 substrate, TiN and TiAlN coatings were deposited via multi-arc ion plating (MIP) to investigate the effect of this pretreatment on the coating properties. The hardness of the TiN and TiAlN coatings, as measured by nanoindentation, was 32.53 GPa and 39.5 GPa, respectively. A comparative study was conducted on the wear resistance of the coatings with a tribometer. The results indicated that the wear rate was reduced from the order of 10‒5 mm3/(N·m) to the order of 10‒6 mm3/(N·m) after the nanocrystallization treatment. Based on the independently developed sand erosion experimental platform, the corrosion resistance of TiN and TiAlN coatings was systematically evaluated. SEM morphology analysis showed that there was a significant difference in the erosion damage mechanism and erosion resistance of the two coatings. Further research revealed that surface nano-treatment could effectively improve the mechanical properties of the coating. The interface structure of TiAlN coating with pre-nanification treatment can effectively inhibit the initiation and expansion of erosion cracks, thereby showing the best erosion resistance.
关键词
纳米化 /
多弧离子镀技术 /
TiN /
TiAlN /
磨损 /
冲蚀
Key words
nanocrystallization /
multi-arc ion plating /
TiN /
TiAlN /
wear /
erosion
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基金
浙江省“尖兵领雁+X”研发攻关计划（2024C01235）
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