High temperature investigation of the tribo mechanical behavior of TiAlSiN and CrAlSiN nanocomposite coatings

PVD涂层是一种已经确立的概念，用于廉价基材表面的功能化，以提高部件的性能和使用寿命，而不使用由昂贵的特殊材料制成的固体部件。到目前为止，通过薄膜技术涂覆的刀具经常用于切削和冷成形行业，尽管这些涂层系统在较高的工作温度下不能提供足够的耐磨性和机械性能。通过使用在拟议研究项目背景下开发的纳米复合材料层，通过在三元涂层体系（CrAlN和TiAlN）中使硅合金化来扩大温度限制，以获得耐热和抗氧化的PVD涂层。因此，不同的工艺参数和PVD技术对TiAlSiN和CrAlSiN涂层的影响进行了研究，以确定参数和涂层的所得性能之间的相关性。特别是不同的衬底处理方法，硅含量，目标功率，和偏压上的形态，机械和摩擦学性能在不同的温度水平（20，250和500°C）的影响进行了密切的研究和评估。调查完成了在台湾进行的测试，在高温下的疲劳行为。材料工程研究所的PVD涂层沉积是通过使用磁控溅射工艺进行的。与此同时，在台湾的一家合作伙伴研究所，通过电弧蒸发工艺沉积了相同的涂层系统。这种方法提供了比较不同的纳米复合材料层的性能和确定工艺特定特性的机会。最后，层（CrAlSiN和TiAlSiN）的两种不同的沉积工艺的最佳性能施加在成形工具和他们的性能进行了测试和评估，在一个真实的成形过程中增加的操作温度。

PVD-coatings are an already established concept for the functionalization of surfaces of cheap substrate materials in order to improve the performance and service life of components without using solid components made of expensive special materials. Until now, tools coated by means of thin-film technology are frequently used in the cutting and cold forming industry, even though these coating systems do not offer sufficient wear resistance and mechanical properties at higher operating temperatures.By using nanocomposite layers, which are developed in the context of the proposed research project, the temperature limitations are expanded by alloying silicon in ternary coating systems (CrAlN and TiAlN) to obtain a thermal and oxidation resistant PVD-coating. Therefore, the influence of different process parameters and PVD technologies on TiAlSiN and CrAlSiN coatings is investigated to determine the correlations between the parameters and the resulting properties of the coating. Especially the influence of different substrate treatment methods, the silicon content, the target power, and the bias voltage on the morphological, mechanical and tribological properties at different temperature levels (20, 250 and 500°C) are closely investigated and evaluated. The investigations are completed by tests carried out in Taiwan, concerning the fatigue behavior at elevated temperatures. The deposition of the PVD coatings at the Institute of Materials Engineering are produced by using the magnetron sputtering process. At the same time, identical coating systems are deposited at a Taiwanese cooperating partner institute by means of an arc-evaporation process. This approach offers the opportunity to compare the different nanocomposite layers regarding their properties and to identify process specific characteristics. Finally, the layers (CrAlSiN and TiAlSiN) with the best properties of both different deposition processes are applied on forming tools and their performance is tested and evaluated in a real forming process with increased operating temperatures.