Analysis of the cold gas spraying for the production of cBN-metal-composite coatings and their qualification for application as grinding tools

• Applicants: Professor Dr.-Ing. Dirk Biermann; Professor Dr.-Ing. Wolfgang Tillmann
• Subject Area: Metal-Cutting and Abrasive Manufacturing Engineering ; Coating and Surface Technology
• Term: since 2023
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 525767050

The overall objective of the planned research project is to produce cBN-metal-composite coatings and their qualification for application as alternative grinding tools. To create innovative, individual and application-specific grinding tools the project focuses the thermal spraying as an alternative production process. Using the Cold Gas Spraying it is possible to produce abrasive-metal-composite coatings with different abrasives and bonding materials. The qualification of the composite coatings as grinding tools requires extensive fundamental research. The starting point of the investigations are cBN-metal composite coatings, which are to be used for the grinding of rolling bearing steel. Regarding the thermal spraying process, the first step is to gain an understanding of the integration of cBN particles. This is relevant for layer properties and the layer development in order to adjust the structure of the cBN-metal-composite coatings to suit the grinding process. Essential questions exist regarding the adhesion and porosity of the cBN-metal-composite coatings. First of all, fundamental investigations are necessary with regard to the dressing processes of the abrasive coatings, in order to qualify the new cBN-metal-composite coatings as grinding tools. This is necessary to adjust and analyze the runout accuracy and the profile of the grinding tools as well as to create a suitable topography of the abrasive coatings. In addition to the dressing processes, an analysis of the behaviour of the cBN-metal composite coatings during the grinding of rolling bearing steel follows. The mechanical load as well as the surface topography of the specimens during the grinding process will be evaluated. Furthermore, a detailed macroscopic and microscopic analysis of the wear behaviour of the grinding tools is necessary, which requires a comprehensive characterization of the composite layers both before and after use.

• DFG Programme: Research Grants
• Major Instrumentation: Pulverförderer