Bonded Molybdenum Disulphide Film Life with Sliding Speed

There are probably four important modes of failure of molybdenum disulphide films, namely loss of adhesion or film break-up), wear, oxidation, and possibly fatigue. 

One form of film break-up has been mentioned previously, in which the surface of a relatively thick film becomes consolidated over a soft unconsolidated layer. This can lead to shear in the soft layer, especially with high non-conformal loading, and the consolidated layer will break away. Loss of adhesion and film break-up can also occur, especially with a bonded film, if the surface pre-treatment has been badly performed, so that the coating simply fails to adhere and breaks away. These cases may be considered as premature failures caused by poor film preparation. 

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Figure 7.13 Variation of Bonded Molybdenum Disulphide Film Life with Sliding Speed Ref. 183)...

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