| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of manufacturing a powder metallurgy workpiece and its workpiece.SOLUTION: A method of manufacturing a powder metallurgy includes a step of proving the first powder having a hardness substantially below 250 HV and an average particle diameter of 20 μm or less, a step of mixing the first powder and the second powder to obtain a mixture powder containing a component selected from a group consisting of carbon, chromium, iron, molybdenum, nickel, copper, niobium, vanadium, tungsten, silicon, cobalt and manganese, a step of adding a binder and water to the mixture powder, a step of applying a granulation process to the mixture powder to form a spray granulation powder, a step of applying a dry press molding to the spray granulation powder to form the spray granulation powder as a green body, a step of applying a defatting process to the green body to form molded product, and a step of sintering the molded body to obtain a workpiece having a hardness above 250 HV. |
