ABSTRACT

A duplex treatment, namely, plasma carbonitriding followed by multi-arc ion plating, was used to improve the high-temperature tribological properties of TiAlCrN coatings on 300M steel in this research. The carbonitriding layer was first prepared on 300M steel substrates by the double glow plasma metallization technique. A corresponding heat treatment was performed, and then the TiAlCrN coating was synthesised on the surface of the carbonitriding layer and 300M steel substrates by multiarc ion plating. The microstructure, element composition and structural variations of the TiAlCrN coating were characterised using XRD, SEM and EDS. Moreover, the adhesion and high-temperature tribological behaviours of TiAlCrN coatings were studied by scratch tests and ball-on-disk wear tests, respectively. It was observed that the PCN + TiAlCrN coating showed gradient hardness support, a good chemical composition gradient and a diffusion effect in the carbonitriding process, which could significantly enhance the adhesion and tribological performance of the composite coating.

摘要

在本研究中，采用双相处理，即等离子碳氮共渗，然后进行多弧离子镀，来改善300M钢上TiAlCrN涂层的高温摩擦学性能。首先通过双辉等离子体金属化技术在300M钢基底上制备碳氮共渗层。进行相应的热处理，然后通过多弧离子镀在碳氮共渗层和300M钢基底的表面上合成TiAlCrN涂层。利用XRD，SEM和EDS对TiAlCrN涂层的微观结构，元素组成和结构变化进行了表征。此外，分别通过划痕试验和圆盘磨损试验研究了TiAlCrN涂层的附着力和高温摩擦学行为。