Abstract
The sintering of cemented carbides based on WC–Co with different carbon contents and additions of (Ti,W)C has been studied by dilatometry and analysed in terms of a densification model. Shrinkage starts around 1000 °C for WC–Co and in the range 1100–1250 °C for WC–(Ti,W)C–Co. Although a high carbon content initially delays shrinkage in WC–Co it leads eventually to high shrinkage rates and a fully dense material in the shortest time. Practically no difference was found between low and medium carbon contents. For WC–(Ti,W)C–Co, onset of shrinkage depends more strongly on composition and increases with decreasing carbon content. Shrinkage rates are described with a proposed model based on uniaxial viscosity, viscous equivalent of Poisson’s ratio and sintering stress. The three densification stages observed for WC–Co materials reduce to two stages for WC–(Ti,C)C–Co, where higher apparent activation energies also are observed during solid state sintering.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call