Coated surfaces for bearings used in drilling motors

A bearing, comprising:

• the bearing being configured as a thrust bearing and being configured for use in mud lubricated drilling equipment;
• an outer raceway comprising first and second outer raceway segments, wherein each of the first and second outer raceway segments has two outer raceways configured to contact two separate rows of rolling elements;
• an inner raceway comprising first and second inner raceway segments, wherein each of the first and second inner raceway segments has two inner raceways configured to contact two separate rows of rolling elements;
• a first row of rolling elements comprises a plurality of rolling elements disposed between the outer raceway and the inner raceway such that each of the plurality of rolling elements therein contacts each of the first and second outer raceway segments and each of the first and second inner raceway segments;
• and
• wherein the outer raceway and the inner raceway each comprises a steel substrate covered with a tungsten carbide coating wherein the tungsten carbide coating has a thickness between five micrometers (5 μm) to three hundred micrometers (300 μm).