Abstract: The stator of vane air motor is conventionally made of medium carbon alloy steel such as 40CrMnMo and processed by a technology including integral quenching.  In the research, rare-earth magnesium ductile cast iron material was selected for the stator and processed by a technology including hardening or normalizing treatment. The stators made of the above two materials respectively were compared and proven to have an equivalent wear resistance. But, the newly selected material and the new processing technology can remarkably ease the processing, improve the product qualification rate and save the cost. This technology has achieved good results in its industrial application.

Key words: Stator of vane air motor, Stator material, Rare-earth magnesium ductile cast iron, Wear resistance performance