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The role of MoS₂ in Al₂O₃ ceramic coatings in dry sliding was examined experimentally. The result indicates that the tribological behaviour of pure Al₂O₃ ceramic coating is inconsistent. It is shown here that a reduction in wear volume of 2–9 times in magnitude is achieved when Al₂O₃ is codeposited with MoS₂ in different ratios. The optimum percentage by weight of MoS₂ to be codeposited with Al₂O₃ was found to be 40%. Increases or decreases in this percentage increase the wear volume, but the coating is still tribologically superior to pure Al₂O₃ coatings.

The rupture and removal of this codeposited coating, unlike pure Al₂O₃ coatings, does not show any sign of catastrophic increase in wear volume. The rupture of codeposited Al₂O₃-MoS₂ coatings is found to be very slow and is followed by the formation of a black coloured solid lubricant film on the contact surface.