大厚度TiAlN涂层力学性能的研究

Study on Mechanical Property of TiAlN Coatings of Large Thickness

采用电弧离子镀技术在不锈钢基体上制备了大厚度TiAlN涂层,并对大厚度涂层的力学性能进行了系统的研究。结果表明:梯度增加和循环增加N2流量制备大厚度涂层的厚度分别达到68.79μm和64.48μm,且涂层力学性能良好;大厚度涂层残余应力沿层深的分布,总体趋势从膜基界面向表面逐渐增大,全膜厚平均压应力低于1GPa,表面硬度近2000HV,循环大厚度涂层的膜基结合好于梯度大厚度涂层,而梯度大厚度涂层展现出更低的摩擦系数与磨损率。

The mechanical property of TiAlN coatings of large thickness deposited on stainless steel substrate by arc ion plating（AIP） was systematically investigated. The results indicated that the thickness of the coatings deposited by AIP with the increasing flow of N2 by way of cycle or stepwise could reach 68.79 μm and 64.48 μm respectively, and those coatings show fairly well mechanical performance. The depth profile of residual stress of the coatings presented a general trend that the stress increased gradually from the coating/substrate interface to the top surface. The average compressive stress of the coatings is lower than 1 GPa, and its surface hardness almost reaches 2000 HV. The former coating has lower friction coefficient and wear rate, whereas the later one shows better coating/substrate adhesion.