[T18] Non-oxide Materials

[16D-T18-02] Enhancing Performance and Dressability of Metal-Bonded Diamond Grinding Wheels for Machining Cemented Carbides through Graphite and Chromium Additions

*R. Lang¹, B. Bergmann¹, B. Denkena¹ (1.Leibniz Universität Hannover, IFW, Germany)

Keywords:Grinding, Cemented Carbide, Diamond, Graphite, Chromium Carbide

Metal-bonded diamond grinding wheels for machining cemented carbides are characterized by high hardness and thermal conductivity, but also by low porosity and limited dressability. The addition of graphite to these bonds induces a deliberate weakening of the bond, improving dressing behaviour while simultaneously enhancing thermal conductivity. The influence of sintering parameters and the addition of graphite in spherical and flake forms, with varying particle sizes, on the mechanical and thermal properties of the grinding layer is investigated. Furthermore, the addition of chromium is investigated and leads to an additional increase in the critical bond strength of the grinding layer. A subsequent examination of the performance of the manufactured grinding layers with chromium and graphite additions demonstrates improved dressing behaviour, wear resistance, and lower grinding temperatures due to the higher thermal conductivity of the grinding layer.