HIGH DENSITY TUNGSTEN MATERIAL SINTERED AT LOW TEMPERATURE

摘要

The invention concerns a tungsten-based sintered material, with relative mean density higher than 93 % and HV0.3 hardness >/= 400. It comprises: tungsten having a purity higher than 99.9 %, an additive consisting of nickel and/or cobalt powder in a mass percentage not more than 0.08 %, an average particle size of tungsten grains of equiaxial shape ranging between 2 and 40 mu m and uniformly distributed for a given average size; and uniformly distributed residual porosity with less than 85 % of the population of pores having a unit volume less than 4 mu m<3>.