Preparation method of copper-free metallurgical material, copper-free metallurgical material, balance weight and compressor

The invention relates to the technical field of powder metallurgy, and discloses a preparation method of a copper-free metallurgical material, the copper-free metallurgical material, a balance weightand a compressor. The method comprises the following steps that (I) prealloyed powder containing Fe, Mn and Cr is subjected to ball milling to obtain ball milling powder; (II) the ball milling powder,an activating agent and a lubricant are mixed, and an obtained mixture is formed to obtain a semi-finished copper-free metallurgical material; and (III) the semi-finished copper-free metallurgical material obtained in the step (II) is sintered to obtain a finished copper-free metallurgical material. The copper-free metallurgical material obtained through the preparation method has the characteristics of low production cost and high density, and the obtained copper-free metallurgical material can serve as the balance weight and is especially suitable for the balance weight for the compressor. 本发明涉及粉末冶金技术领域，公开了一种无铜冶金材料的