| 摘要 |
PURPOSE:To prepare a coated sintered hard alloy excellent in heat shock resistance and tenacity, by a method wherein parts comprising a sintered hard alloy comprising bonding a hard phase consisting WC and B-1 type solid solution with a ferrous metal is heated in an N2 atmosphere and a TiN film is applied to the heated parts to enhance the bonding strength of the film. CONSTITUTION:Parts comprising a sintered hard alloy containing WC and B-1 type solid solution as hard phases bonded with a ferrous metal is held at 1,200- 1,600 deg.C for 10min-5hr in an atmosphere of which N2 partial pressure is 1- 700torr to enrich the surface thereof with the B-1 type solid solution. In the next type, a TiN coating film is applied to the surface thereof. By this method, bonding strength between a sintered hard matrix material and the film is improved and a coated sintered hard alloy excellent in heat shock resistance and mechanical tenacity can be obtained. |
