Investigation of an innovative method for the production of diamond reinforced coatings by HVOF and Warm Spraying for highly wear loaded surfaces (re-submission)

金刚石颗粒尺寸较小的金刚石金属复合层可用作工具和结构件(堆焊)的超耐磨保护层。尤其是石材加工领域的高磨料、高冲蚀和高冲击载荷，导致刀具磨损增加，这超出了传统耐磨涂层的能力。本研究的目的是详细了解高速氧气燃料喷涂(HVOF)和温喷涂(WS)热喷涂金属涂层钻石和金刚石金属粉末的过程和机理。由于高动能和中等热能的结合以及宽可调的参数，该方法为生产金刚石浸渍金属基复合层提供了突出的特点。在实际磨损条件下的模型试验中，对超音速火焰喷涂和超音速火焰喷涂金刚石金属复合层的潜力进行了初步的研究。为此，磨料磨损、冲蚀磨损和冲击磨损条件被认为是广泛的。目的是阐明金刚石浸渍金属基复合层的磨损和失效机理，并确定热喷涂工艺参数的影响。由于对涂层过程和磨损机理的全面了解，将有可能根据所有参数来制定最佳解决方案(涂层)。

Diamond metal composite layers with small diamond grain sizes can be used as super wear-resistant protective layers for tools and structural components (hardfacing). Especially the high abrasive, erosive and impact loads in the field of stone processing, for example during deep drilling, lead to increased tool wear, which is beyond the capabilities of conventional wear-resistant coatings.The aim of this research project is to develop a detailed understanding of the processes and mechanisms during the thermal spraying of metallic coated diamonds as well as diamond metal powders by High Velocity Oxygen Fuel Spraying (HVOF) and Warm Spraying (WS). The methods offer, due to the combination of high kinetic and moderate thermal energy as well as the wide adjustable parameters, outstanding features for the production of diamond impregnated metal matrix composite layers. The potential of diamond metal composite layers sprayed by HVOF and WS is investigated fundamentally in model tests under realistic wear conditions. For this purpose, abrasive, erosive and impact wear conditions are considered extensive. The aim is to elucidate the wear and failure mechanisms of diamond impregnated metal matrix composite layers and to identify the influence of thermal spraying parameters. Due to the comprehensive understanding of the coating process and the wear mechanisms, it will be possible to formulate an optimal solution (coating) as a function of all parameters.