METHOD FOR THE PRODUCTION OF PELLETS OF SINTERED MATERIAL, SUCH AS BORON CARBIDE PELLETS

摘要

A method for producing pellets of sintered material, comprising: a) forming calibrated pre-compacts by first uniaxial pressing of equal portions powder at a first threshold below the maximum green density threshold of the powder; b) providing a pressing tool set comprising a die having a plurality of cavities and pressure pistons; c) placing the pre-compacts in the cavities with first and second sintered boron nitride disks, having a thickness in the millimetre range and a density =90%; d) forming calibrated compacts by second uniaxial pressing of the pre-compacts using the pressure pistons at a second threshold greater than the first threshold, which is less than or equal to the maximum green density of the powder; e) forming sintered compacts by applying pressure and a pulsed current to the pressing tool set to bring about a rapid rise in temperature according to a temperature-, pressure- and duration-controlled SPS sintering cycle.