冷作模具钢等离子渗镀CrVN复合涂层摩擦磨损性能研究

Study on Wear Properties of Duplex-Treated CrVN Composite Coatings by Plasma Nitriding and Arc Ion Plating

采用等离子渗镀技术在DC 53冷作模具钢表面制备CrN和CrVN复合涂层,利用X射线衍射仪(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、显微硬度计和摩擦磨损试验机,对比研究了两种涂层的组织结构、力学性能以及摩擦磨损性能。结果表明:所制备的CrN和CrVN涂层均为面心立方(fcc)结构,并呈现(111)择优取向,其中CrVN涂层形成了以fcc-CrN相为基础的CrVN固溶体结构。CrN涂层中掺入V抑制了柱状晶生长,涂层结构更加致密,硬度和结合力明显提高,摩擦系数及磨损率降低。CrVN涂层表面粗糙度较低,并在摩擦过程中生成具有自润滑性的VO2,涂层抗粘铝性能得到改善。

Duplex-treated CrN and CrVN composite coatings were prepared on DC 53 cold work die steel substrates by plasma nitriding and arc ion plating.The microstructure,mechanical and wear properties of coatings were investigated by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM),microhardness tester and tribometer,respectively.The results showed that the as-deposited coatings were fcc structures with a(111)preferred orientation.The CrVN solid solution structure based on the fcc-CrN phase was obtained in CrVN coating.Compared to the CrN coating,the columnar grain growth was suppressed with the addition of V and the CrVN coating became denser.The microhardness and adhesive strength of V-doped CrN coating were obviously improved,while the friction coefficient and wear rate of the coating were reduced.The sticking resistance of aluminium was enhanced for CrVN coating due to the low surface roughness and the formation of self-lubricating VO2 during the wear process.