Sintering shrinkage of WC-Co and WC-(Ti,W)C-Co materials with different carbon contents
2004 (English)In: International Journal of Refractory Metals and Hard Materials, ISSN 0263-4368, Vol. 22, no 4-5, 211-217 p.Article in journal (Refereed) Published
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 1000degreesC for WC-Co and in the range 1100-1250degreesC 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.
Place, publisher, year, edition, pages
2004. Vol. 22, no 4-5, 211-217 p.
cemented carbides, sintering, shrinkage, carbon content, cubic carbides
IdentifiersURN: urn:nbn:se:kth:diva-45867DOI: 10.1016/j.ijrmhm.2004.07.003ISI: 000225390800008ScopusID: 2-s2.0-9244246284OAI: oai:DiVA.org:kth-45867DiVA: diva2:453228
QC 201111012011-11-012011-11-012011-11-01Bibliographically approved