ISOTHERMAL SINTERING OF METAL-LIKE CARBIDES ORIGINATED FROM GROUP 4-6 OF THE PERIODIC TABLE OF THE ELEMENTS

摘要

In this work,sintering kinetics of some pure metal-like carbides such as TiC_(08),NbC,WC was studied. Measurements were made by means of a high temperature dilatometer. Sintering shrinkage as a function of time was recorded under isothermal conditions. An analysis of the sintering kinetics was based on sintering models worked out by Kuczynski and Frenkel. Kinetic equations describing a sintering process of each carbide were formulated according to the Kuczynski's model. Comparison of kinetic equations and densification behaviour was fundamental to determine similarities and differences in the sintering process of the studied carbides. The second sintering model was used to determine sintering parameters i.e. α,β,α~(-1) ,β~(-1) and η_o as a function of temperature. The presented results allowed a full sintering characteristics of the studied metal-like carbides to be obtained.