Near-surface microstructural modification of (Ti,W)(C,N)/Co hardmetals by nitridation
Source abstract
Abstract
For developing functional-gradient hardmetals the interaction of nitrogen with (Ti,W)(C,N)/Co hardmetals was investigated. Industrially sintered (Ti,W)(C,N)/Co hardmetals were heat treated above (1500 °C) and below (1200 and 1300 °C) the eutectic temperature using nitrogen pressures up to 25 bar. Above the eutectic temperature compact Ti(C,N) top layers followed by a more or less graded microstructure independent on sample composition were observed. Below the eutectic temperature the microstructure formation is mainly influenced by the sample composition. A Ti(C,N) top diffusion layer forms in materials with a high Ti(C,N) content in which the [N]/[C] ratio decreases towards the interior. Contrary, interaction zones without a layer were obtained in compacts with a high WC content. Cutting tests were performed which showed that such surface-modified hardmetals are superior to non-modified grades of similar overall composition. A ten-fold increase of cutting life time for a surface-modified grade, which has a Ti(C,N) diffusion layer on top, could be observed.
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