Abstract:

The friction performance and humidity-heat durability of material CF170 with MoS₂ solid lubrication coating in vacuum environment are researched. The theoretical basis and experimental data are provided for the selection of reliable solid lubrication coating of space machine. Different MoS₂ solid lubrication coating of material CF170 surface is produced and experimentation of friction performance and humidity-heat durability are made. They are the bonded MoS₂ solid lubrication organic coating, The bonded MoS₂ solid lubrication inorganic coating and the sputter-deposited MoS₂ solid lubrication coating. The microcosmic analysis of friction wear feature through optical microscopy and scanning electric microscope are performed. Through analysis it can be known that the bonded MoS₂ solid lubrication organic coating can reduce friction coefficient though come into being slippage side in the process of friction; the bonded MoS₂ solid lubrication inorganic coating can reduce friction coefficient and extend wearable life through conversion from sliding friction to rolling friction in the process of friction; the sputter-deposited MoS₂ solid lubrication coating can enhance lubricate effect because it is peel off the sample in the process of friction, and the friction transform point touch into side touch. The test result indicate that the sputter-deposited MoS₂ solid lubrication coating have small average friction coefficient, long wearable life, low wear rate and excellent humidity-heat durability in vacuum environment. Therefore, the sputter-deposited MoS₂ solid lubrication coating is appropriate lubrication coating of space machine.

Key words: friction wear, humidity-heat durability, vacuum environment, solid lubrication coating