| 摘要 |
PURPOSE:To enable prevention of failure in a sintered body on account of a treatment operation by performing a nitriding treatment and a succeeding steam treatment of a sintered body in a common treatment furnace which is in common use as a treatment furnace for both, thereby reducing an equipment cost and making the treatment operation easy. CONSTITUTION:A sintered body 21 is placed on the rack 20 in a furnace body 11. Valves 14 are then opened to supply gases for soft nitriding from respective feed pipes 13 to form an atmosphere. The gases and the sintered body 21 in the body 11 are heated by an electric heater 12. Nitride is formed on the inner particle surface in the body 21 by such gas soft nitriding treatment, whereby the wear resistance of said body is improved. A valve 18 is then opened to discharge the gas from the inside of the body 11. A valve 16 is opened to supply steam from a steam feed pipe 15 to form a steam atmosphere in the body 11 in the state of putting the body 21 in the body 11 and the body 21 is heated by a heater 12 to form oxide in the holes of the body 2, so that the oxide on the particle surface is diffused to the inside. |
