Endurance of Some Burnished Dichalcogenide Films

Kirner reported the successful use of plasma spraying for niobium diselenide, niobium ditelluride, and a mixture of tungsten disulphide and silver, but the performances in high vacuum and high temperature were inferior to those obtained with molybdenum disulphide. There has been a great deal of Russian work on the 

The poor film-forming properties of some of the synthetics, and the occasional reports of inferior film performance even for the best of them, are presumably less critical when they are incorporated in composites. The ability to form a satisfactory transfer film on a counterface would still be important, but there seem to have been no fundamental studies of this aspect of their performance. Whatever the reason, published papers indicate that far more effort, both research and commercial, has been devoted to the development and use of the synthetic dichalcogenides in composites than in film form. 

The temperature limits are more curious. There seems to be no evidence from other published literature for the much higher temperature performance in vacuum of the niobium diselenide and tungsten diselenide than tungsten disulphide, and the very inferior performance of molybdenum disulphide. Similarly, there is no obvious reason 

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Table 14.9 Endurance of Some Burnished Dichalcogenide Films (Based on data from Ref.267)...

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