基于等离子渗氮（PN）和高功率脉冲磁控溅射（HiPIMS）技术兼具高离化、原位组合制备（超）硬质复合涂层的优势，选择工程应用广泛的钨钴硬质合金为基体，率先制备出氮元素和硬度呈梯度分布的高性能复合涂层（氮化层-纳米WN膜）。首先探讨研磨态/抛光态硬质合金表面Ar-N2混合气高离化等离子渗氮工艺与渗氮层成分-结构-性能的内在关系；然后原位采用纯W靶、HiPIMS技术、Ar-N2混合气在渗氮层上沉积数微米厚的纳米WN膜，研究气体和溅射金属粒子的高离化关键工艺参数对纳米WN膜成分-结构-性能的影响规律。重点研究：（1）硬质合金表面渗氮层中化合物相（WNx、CoNx）的形成机制与位向关系；（2）化合物相层与溅镀纳米WN膜之间的界面结构与位向关系。探明硬质合金表面高离化等离子渗氮处理的组织演变规律，揭示高离化溅镀纳米WN膜的生长机制和附着性增强机理，为新型超硬涂层体系的工业应用提供基础数据和技术支撑。

Superhard or hard composite coating's preparation methods using in-situ plasma nitriding (PN) and high power impulse magnetron sputtering (HiPIMS) integration technologies (also known as Duplex hybrid technology) with high ionization degrees have a lot of advantages. Traditional WC-Co hardmetals used widely were selected as substrate, high performance composite coatings were firstly prepared with the gradient distribution of N element content and microhardness. The intrinsic relationships between the key technological parameters of Ar-N2 mixed gas plasma nitriding process with a high ionization degree on as-grinded or as-polished cemented carbide surface and compositions, structures, properties of the nitriding layers were investigated, then in-situ several microns thick nanocrystalline WN coatings on the nitriding layer were reactive sputter deposited using pure W target, HiPIMS technology and Ar-N2 mixed gas, the effect laws between the key technological parameters in favour of high ionization degrees for inlet gases and metallic particles sputtered from W target and the nanocrystalline WN coating's compositions, structures, properties were explored. Mainly focusing on: (1) the formation mechanisms and orientation relationships of compound phases (WNx, CoNx) within nitriding layer on cemented carbide surface; (2) the interfacial structures and orientation relationships between the compound layer and the nanocrystalline WN coating. The microstructure evolution laws of cemented carbide surface using plasma nitriding treatment with high ionization degree were ascertained, the growth mechanisms and adhesion enhancement mechanisms of nanocrystalline WN coating magnetron sputter deposited with high ionization degree were revealed, and the basic data and technical support was provided for the industrial applications of a new type of superhard coating system.