Shrinkage,liquid phase formation,phase transformation and gas feactions during the sintering of WC-Co hard metals

摘要

The outgassing and sintering processes occuring during the heating period are very decisive for the quality of the sintered hard metal.The largest proportion of the compaction takes place in the solid state,i.e. before the formation of the liquid phase.In the internsive stage of shrinkage the reduction of porosity is determined by particle rearrangements.On the other hand the solution of tungsten and carbon in the cobalt binder is determined by diffusion-controlled processes.