Manganese source powder adopting core-shell structure and used for powder metallurgy and preparation method of manganese source powder

The invention discloses manganese source powder adopting a core-shell structure and used for powder metallurgy and a preparation method of the manganese source powder. The core-shell structure of the manganese source powder comprises an inner core formed by manganese particles and a nitride shell, wherein the manganese particles are selected from one of electrolytic manganese powder, ferro-manganese prealloy powder and ferro-manganese master alloy powder; nitride is generated by the manganese particles in situ in nitrogen-containing gas at the temperature below 800 DEG C. The preparation method comprises steps as follows: the manganese particles are put in a heating furnace and heated to 600-800 DEG C, subjected to thermal insulation for at least 60 minutes and then cooled, and the manganese source powder adopting the core-shell structure is obtained; nitrogen-containing gas is introduced into the furnace all the time in the heating, thermal insulation and cooling processes. The preparation method is simple, the prepared manganese source powder adopting the core-shell structure has good oxidation resistance at the normal temperature, the nitrogen content is controllable and is lower, and small influences are produced on compressibility of iron-based powder after the manganese source powder is added. With the adoption of the manganese source powder adopting the core-shell structure, a manganese-containing low-alloy steel sintering product with high density, low oxygen content and excellent comprehensive mechanical property can be prepared.