针对DLC薄膜内应力大，与金属基体结合力差的应用瓶颈，通过渗碳层与DLC薄膜复合来发挥两者优势。申请人突破传统复合层需要多工序、多设备制备的技术局限，提出基于辉光放电等离子体渗碳技术原位构筑渗碳层/DLC薄膜复合层的思想，实现合金钢表面耐磨减摩复合层的一步法制备。本申请聚焦于渗碳层/DLC薄膜复合层的研究：DLC薄膜的结构-性能优化模型；DLC薄膜的形成机制和生长动力学；渗碳层/DLC薄膜界面结构和结合力优化；渗碳层/DLC薄膜复合层的力学性能和摩擦磨损性能。最终形成高效率、低成本和规模化构筑优异渗碳层/DLC薄膜复合层的辉光放电等离子体渗碳创新理论和技术，对于发展等离子体渗碳技术和丰富DLC薄膜的生长理论，推动DLC薄膜在金属表面的实用化进程，具有重要的研究意义。

Aimed at the bottleneck problem in the application of DLC films, including excessive internal stress and poor adhesion of DLC films with metals, the combination of carburized layers and DLC films may take respective advantages. The applicant has proposed an in-situ formed duplex layer composed of carburized layer and DLC film through glow discharge plasma carburizing to replace conventional preparation method with multi-process and multi-devices. Thus, the duplex layer with wear-resisting and anti-friction performance was successfully prepared by one-step method. The application focuses on investigations of duplex layer, including (i) optimization model of DLC films involved with structure and properties; (ii) formation mechanism and growth kinetics of DLC films; (iii) interfacial structure between carburized layer and DLC film, and thus optimization of DLC film adhesion; (iv) mechanical and tribological properties of duplex layer. Finally, innovative theory and technology involved with the glow discharge plasma carburizing that produces excellent duplex layer on a large scale efficiently and economically was developed, which will contribute to development of plasma carburizing and growth theory of DLC films. These will be applied to promote practical use of DLC films on alloy steel, which are of significance to theoretical studies.