Abstract
Based on analysis of literature data on coatings playing a role of solid lubricants, prospective research areas have been identified. Two categories of coating materials are considered: with hardness lower than 10 GPa (polymers, soft metals, halides, dichalcogenides of transition metals, sulphates of alkaline earth metals, graphite) and with hardness higher than 10 GPa (oxides, carbides, nitrides, borides of transition metals, carbon-based composites). Methods of their deposition and surface structuring are discussed as well. The greatest effect is observed when coatings are deposited using combined techniques involving surface structuring. The development of new nanostructured high-temperature composite coatings that can adapt to extreme performance conditions is regarded as the most promising area of research for the next decade.
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