Chen L.C.LI-CHYONG CHEN2022-08-092022-08-09199302634368https://www.scopus.com/inward/record.uri?eid=2-s2.0-0027836065&doi=10.1016%2f0263-4368%2893%2990074-P&partnerID=40&md5=ff9ad51228104fb7d30c6044e32345f5https://scholars.lib.ntu.edu.tw/handle/123456789/616471Dilatometric data and analyses are provided for the densification of tungsten powder and tungsten powder with hafnia and ceria additions. The characteristic shrinkage curve was found to depend on the type of oxide added into the W matrix. The activation energies of the densification rate were obtained by analyzing the shift of the iso-density points as a function of the linear-heating rate. A unique density-dependent function in the densification-rate equation is also illustrated. Sintering of both W and ceria-dispersed W was found to be controlled by grain-boundary diffusion, but ceria additions in the W matrix resulted in a higher activation energy. The activation energies for W and ceria-dispersed W were 318±21 and 385±15 KJ/mole, respectively. A possible correlation between activation energy and interfacial energy was discussed. A single predominant mechanism that governs the densification in hafnia-dispersed W could not be determined. A tentative scenario whereby the dispersed hafnia enhances or retards sintering is suggested. © 1994.[SDGs]SDG7Densification;Density (specific gravity);Diffusion;Dilatometers;Dispersions;Interfacial energy;Oxides;Powder metals;Reaction kinetics;Sintering;Activation energy;Ceria;Dilatometric analysis;Hafnia;High temperature mechanical properties;Tungstenjournal article10.1016/0263-4368(93)90074-P2-s2.0-0027836065