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MoS 2 ‐based alloys and nanocomposites for solid lubrication
Author(s) -
Savan A.,
Haefke H.
Publication year - 2004
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010160304
Subject(s) - materials science , nanocomposite , coating , nanoclusters , crystallite , metal , lubrication , chemical engineering , substrate (aquarium) , composite material , deposition (geology) , metallurgy , nanotechnology , paleontology , oceanography , sediment , geology , engineering , biology
The development of MoS 2 coatings has involved the modification of substrate surfaces, the addition of metals or compounds to the MoS 2 , and variation in the deposition process parameters affecting the properties of deposited films. More recently, multilayer and periodic nanolayer coating structures have also been investigated. At present, work is concentrated on alloys of MoS 2 , mainly with various metals, and targeted at terrestrial (ambient air) applications. The addition of metals or compounds to physical‐vapour‐deposited MoS 2 has led to improvements in coating performance, for example, greater stability of friction coefficient, greater film endurance, and increased temperature/oxidation resistance. The metal or compound can be either in the form of nanoscale multilayers or mixed with the MoS 2 , sometimes leading to nanoclusters within a MoS 2 matrix. Microstructural analysis seems to show that the primary function of these additives is to suppress the formation of low‐density, columnar structures. At certain concentrations an added metal can also enhance the formation of the tribologically favourable (002) orientation of the MoS 2 crystallites. Other changes in the properties of MoS 2 —metal composites may be due to their oxidation resistance, as indicated by the stability of these films against storage in air and their increased endurance when in sliding contacts at elevated temperatures.