多弧离子镀TiCrAlN涂层的制备及其摩擦性能研究

Preparation and Tribological Properties of TiCrAIN Coating by Multi-arc Ion Plating

为了改善模具钢表面质量,采用多弧离子镀技术在H13模具钢和渗氮H13钢基体上沉积TiCrAlN薄膜,探讨H13钢基体表面渗氮处理对涂层表面形貌、硬度、结合力、抗氧化性和摩擦磨损性能的影响。结果表明:H13钢表面渗氮处理后制备的TiCrAlN涂层表面呈现出更加致密的表面形貌,颗粒与颗粒排列紧密,表面较平整,而且大颗粒的数量相对较少,表面渗氮前后制备的涂层表面呈TiAlCrN(111)面择优取向。表面渗氮后制备的TiCrAlN涂层,相对于基体未渗氮的TiCrAlN涂层,具有更高硬度和结合力,分别为2963.3HV、32.3N,以及更优的抗高温氧化性能。与基体未渗氮的TiCrAlN涂层相比,表面渗氮后制备的TiCrAlN涂层的摩擦系数降低,磨损量减少,摩擦磨损性能更为优异,在表面渗氮处理后,基体由外至内硬度逐渐下降,形成了硬度梯度分布,有助于降低应力集中,基体抵抗变形能力增强,提高了涂层和基体之间的结合性能,能够稳定支撑涂层抵抗磨损载荷,提高了涂层的耐磨性能。

In order to improve the surface quality of die steel,TiCrAIN thin films were deposited on H13 die steel and nitrided H13 steel substrate by multi-arc ion plating technology.The effects of nitriding treatment of H13 steel substrate on the surface morphology,hardness,adhesion,oxidation resistance and friction and wear properties of the TiCrAIN were investigated.The results show that the surface of TiCrAIN coating prepared on H13 steel after nitriding treatment presents a more compact surface morphology,the particles are closely aligned with the particles,the surface is relatively flat,and the number of large particles is relatively small.The coating surface prepared before and after surface nitriding presents a preferred orientation of TiAICrN(1ll)surface.Compared with the TiCrAIN coating without nitriding on the substrate,TiCrAIN coating prepared after surface nitriding has higher hardness and adhesion,respectively 2963.3 HV and 32.3 N,and has better high-temperature oxidation resistance.Compared with the TiCrAIN coating without nitriding of the substrate,the TiCrAIN coating prepared after surface nitriding has lower friction coefficient,less wear,and better friction and wear properties.Afer surface nitriding,the hardness of the nitrided substrate gradually decreases from outside to inside,forming a hardness gradient distribution,which helps to reduce stress concentration,enhances the resistance to deformation of the substrate,and improves the bonding performance between the coating and the substrate.It can stably support the coating to resist the wear load and improve the wear resistance of the coating.