| 摘要 |
PURPOSE:To obtain a high-strength sintered hard material with superior wear resistance, corrosion resistance and heat resistance by adding a mixture of powder of a composite boride consisting of B, Mo and Fe, Co, Ni or the like with TiH2 powder as a binding material to TiB2 powder as a hard material and by carrying out sintering. CONSTITUTION:To hard TiB2 powder of <=3mum average particle size is added a mixture of 2-40% one or more kinds of composite borides of <=3mum average particle size such as Mo2FeB2, Mo2CoB2 and Mo2NiB2 with 0.1-10% TiH2 powder of <=350 mesh particle size as a binding material, and they are mixed. This mixture is wet-ground, dried, filled into a graphite mold, and hot-pressed at 1,400-1,800 deg.C under >=100kg/cm<2> pressure in vacuum or an inert gaseous atmosphere. A green compact of the mixture may be sintered at 1,700-2,000 deg.C and hot-pressed under hydrostatic pressure. |
