Metod för tillverkning Ti(C,N)-(Ti,Ta,W) (C,N)-Co legeringar för skärverktygstillämpningar

摘要

The present invention relates to a method for manufacturing a sintered body of carbonitride alloy with titanium as the main component and at least 2 at% of each of tantalum and tungsten and that the atomic N/(C+N) ratio is 25-50 at% and cobalt as the binder phase and which does not have any compositional gradients or center porosity concentration after sintering. This is achieved by processing the material in a specific sintering cycle with particular nitrogen and carbon monoxide partial pressures to obtain a lower melting point of the liquid phase in the interior of the body than in the surface while balancing the gas atmosphere outside the body with the alloy composition during all stage of the liquid phase sintering.