Use of a TiBN Multilayer Coating for Wear Reduction
- Institute of Metal Forming and Metal-Forming Machines, Leibniz Universitaet Hannover, An der Universitaet 2, 30823 Garbsen (Germany)
- Institute of Materials Science, Leibniz Universitaet Hannover, An der Universitaet 2, 30823 Garbsen (Germany)
The near surface area of forging dies is exposed to high mechanical loads. Additionally thermal and chemical stresses occur during the forging process. Depending on the number of forged parts, several kinds of damage develop in the surface area, which lead to failures of forging dies. Die wear is the main reason of failure with a 70% ratio. The abrasion resistance of the surface area of forging dies has to be increased in order to reduce wear. Therefore different methods were examined such as the increase of the abrasion resistance by plasma nitriding and by coating with ceramic layers (TiN, TiCN, TiC, CrN). These layers are applied to the forging die by using PACVD or PAPVD treatment. At the Institute of Metal Forming and Metal-Forming Machines of the University of Hanover a wear reduction by factor 3.5 compared to nitrided forging dies for forging helical gears was achieved. This was possible by using a coating compound of 18 ceramic layers. These excellent results for the multilayer system can be explained through the energy reduction at the inner boundaries and a crack deflection effect at the phase transitions. The layer support of neighboring layers and a stress relaxation through the stacked construction of the layer system are also improving the durability of the coating. This multilayer coating consists of a TiN-TiCN-TiC layer system with an overall thickness of 1.8 {mu}m. This paper presents investigations of this multilayer compound and further research to reduce wear through an additional TiBN coating layer. With this additional top coating an increase of the thermal resistance and the oxidation resistance can be achieved. As a result of this enhancement a further increase of the wear reduction was expected.
- OSTI ID:
- 21057328
- Journal Information:
- AIP Conference Proceedings, Vol. 908, Issue 1; Conference: NUMIFORM '07: 9. international conference on numerical methods in industrial forming processes, Porto (Portugal), 17-21 Jun 2007; Other Information: DOI: 10.1063/1.2740949; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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