A novel combination of sliding members operable both under dry (without lubrication) and wet (with lubrication) states, which comprises a first member made of a ceramic and a second member made of hard metal containing at least 75% by weight cemented carbide. This combination is useful as a bearing means in a pump of a vertical or inclined shaft type so as to permit actuation of the motor in the dry state and thereafter to continue operation of the pump with lubrication being provided by part of the liquid being pumped. In certain aspects, the ceramic member may be divided into a plurality of segments.
