| 摘要 |
PURPOSE:To form a uniform nitride layer on the surfaces of titled parts having ruggedness, by providing an auxilairy electrode in a treatment furnace, inducing glow discharge in a regulated atmosphere and performing ionic nitriding after the removal by reduction of the oxides on the surface of the materials to be treated. CONSTITUTION:The inside of a treatment furnace 1 is evacuated and a gaseous mixture contg. hydrogen and nitrogen are introduced therein to maintain the pressure in the furnace at 0.1-10Torr. Glow discharge is induced with an auxiliary electrode as a cathode, the furnace body 1 as an anode, and the object 3 to be treated as neutral, and the temp. of the object 3 which is a stainless steel product is heated to 300-450 deg.C by the heat thereof to remove by reduction the oxide films on the surface of the object 3. Glow discharge is then induced in the atmosphere of the gaseous mixture thereof and ionic nitriding is accomplished at 500-600 deg.C. A uniform nitride layer is formed on the surface of a stainless steel gear or the like by the above-mentioned method. |
