During the hard machining of powder metallurgical high-speed steel, finely dispersed carbides in the steel expose tools to both thermal and mechanical load. PVD hard coatings are used to protect the tools from wear, oxidation and diffusion processes. With regard to mechanical and thermal properties, (Ti,Al,Cr,Si)N hard coatings are advantageous compared to (Ti,Al)N due to their nanocomposite coating architecture. In addition to monolithic (Ti,Al,Cr,Si)N, a bilayer coating with a (Ti,Al,Cr,Si)ON top layer is deposited in order to investigate the influence of oxygen on the interaction with the workpiece during machining. The coatings were deposited in an industrial scale coating unit using a hybrid technology consisting of direct current and high power pulse magnetron sputtering (dcMS/HPPMS). The influence of the oxygen/nitrogen and the aluminum/titanium ratio on the coating as well as compound properties of indexable inserts made from cemented carbide were investigated. Furthermore, the oxidation and the phase stability were investigated. Finally, the coating systems were examined in cutting tests during which powder metallurgical high-speed steel was milled using 6 mm cemented carbide milling tools. The coatings show a fine crystalline morphology with a cubic crystal structure and a smooth surface. For oxynitride coatings, both hardness and resistance against plastic deformation show increased values compared to the nitride coatings. The additional oxygen might lead to a more brittle deformation behavior. The coating with an increased titanium/aluminum ratio shows, on the one hand, the best compound properties. On the other hand, its oxidation and phase stability are lower compared to the coatings with a lower ratio. In contrast to titanium, aluminum forms protective oxide layers which increase thermal resistance. In the cutting tests, the nitride coating shows a slightly higher tool life compared to the oxynitride coating. The tool life of the nitride coating with an increased titanium/aluminum ratio is significantly increased compared to the other coatings.

在粉末冶金高速钢的硬加工期间，钢中细分散的碳化物使工具承受热负荷和机械负荷。PVD硬质涂层用于保护工具免受磨损，氧化和扩散过程的影响。关于机械和热性能，（Ti，Al，Cr，Si）N硬涂层与（Ti，Al）N相比具有纳米复合涂层结构的优势。除了整体式（Ti，Al，Cr，Si）N外，还沉积了一层具有（Ti，Al，Cr，Si）ON的双层涂层，以便研究氧气在加工过程中对与工件相互作用的影响。使用包括直流电和大功率脉冲磁控溅射（dcMS / HPPMS）的混合技术，将涂层沉积在工业规模的涂层装置中。研究了氧/氮和铝/钛比对涂层的影响以及硬质合金制成的可转位刀片的复合性能。此外，研究了氧化和相稳定性。最后，在切削测试中检查了涂层系统，在切削测试中，使用6毫米硬质合金铣刀对粉末冶金高速钢进行了铣削。该涂层显示出具有立方晶体结构和光滑表面的精细晶体形态。对于氮氧化物涂层，与氮化物涂层相比，硬度和抗塑性变形性能均显示出更高的值。额外的氧气可能导致更脆的变形行为。一方面，具有增加的钛/铝比的涂层显示出最佳的复合性能。另一方面，与具有较低比例的涂料相比，其氧化和相稳定性较低。与钛相反，铝形成增加热阻的保护性氧化层。在切削试验中，与氮氧化物涂层相比，氮化物涂层的刀具寿命略长。与其他涂层相比，钛/铝比增加的氮化物涂层的工具寿命显着增加。