Water-lubricated behaviour of AISI 440C stainless steel and a DLC coating for an orbital hydraulic motor application

The low-speed, high-torque, orbital hydraulic motor is a component that often uses mineral oil to convert hydraulic energy into the rotational motion of a shaft. The main purpose of our research was to investigate the possibility of using water, which is a much less environmentally damaging working fluid than oil. The limitations of water lubrication were overcome with an appropriate surface-engineering approach. The surface coated with...