Patent ID: 6582535
Filing Date: 2003-06-24
Classification: B22F,C22C,C23C

Abstract:
A manufacturing method of a tungsten target for sputtering, consisting of the steps of:hot-press-sintering a tungsten powder having a powder specific surface of 0.6 m2/g or more as measured according to a BET method in a vacuum or a reducing atmosphere at a temperature of at least 1,600Â° C. and a pressure of at least 200 kg/cm2 to produce a sintered body having a relative density of at least 93%: and performing hot isotropic pressure sintering (HIP) on said sintered body at a temperature of at least 1,700Â° C. and a pressure of at least 1,000 kg/cm2 without capsuling: wherein, after aid hot isotropic pressure sintering step said sintered body has a relative density of at least 99%, an average grain size of no greater than 100&mgr;m, and an oxygen content of no greater than 20 ppm.