| 摘要 |
PURPOSE:To obtain the subject sintered material having decreased residual C content by kneading metallic particles with a binder to form a pellet, forming a green body having a prescribed form from the pellets and maintaining the body in an H2-containing inert gas or H2 gas atmosphere at a temperature within a specific range over a sufficiently long period. CONSTITUTION:One or more kinds of metallic particles such as Fe or Ni having particle diameter of several mum are kneaded with a binder composed of a thermoplastic resin, wax, etc., to form pellets, which are injection-molded to obtain a green body W having a prescribed shape. The green body W is embedded in a processing vessel 3 containing Al2O3 powder 4. The vessels 3 are placed in a degreasing furnace 1. H2-containing inert gas or H2 gas is introduced as an atmospheric gas into the a furnace through a gas-inlet tube 5. The green body W is heated at about 300 deg.C to evaporate and eliminate the binder and then the temperature is raised to 600-800 deg.C to react H2 in the atmosphere gas with C remaining in the binder and remove the C as hydrocarbons. The degreased formed article W is transferred to another vacuum furnace and heated at about 120 deg.C for about 3hr to obtain a sintered material having decreased C content. |
