Self-adaptive lubrication coating used in wide temperature ranges and preparing method thereof

Abstract

The invention discloses a self-adaptive lubrication coating used in wide temperature range and a preparing method thereof. The coating is composed of a middle layer arranged on a substrate and a self-adaptive lubrication coating arranged on the middle layer; the thickness of the self-adaptive lubrication coating is 0.5 micrometer to 200 micrometers, the self-adaptive lubrication coating is a nano microstructure formed through the mutual staggering of a low temperature lubrication unit coating and a high temperature lubrication unit coating in chessboard arrangement, the area ratio of the low temperature lubrication unit coating and the high temperature lubrication unit coating is 0.25 to 0.8, the low temperature lubrication unit coating is a TiAlCN phase or amorphous carbon composite, and the high temperature lubrication unit coating is an Ag single phase or VN phase composite; and the middle layer is Ti or Cr with a thickness of 50 nm to 200 nm. Lubricants used in different temperatures are stored in coating cells, corresponding lubricant is released to friction surfaces with the temperature variation, and the other lubricant is sealed in a cell or a coating subsurface.

Description

technical field [0001] The invention relates to a self-adaptive lubricating coating in a wide temperature range on the surface of mechanical parts and a preparation method thereof, in particular to a self-adapting lubricating coating in an alternating temperature field environment. Background technique [0002] In low temperature (<300°C) lubrication, graphite is often used as a lubricant. Because graphite has a layered structure, the layers are combined by van der Waals force, molecules can easily slide along these planes, and the shear force is small; studies have shown that during the friction process of amorphous carbon coatings, graphite will form on the wear surface. And provide good lubrication. In medium temperature (300°C-500°C) lubrication, the soft metal Ag has a good lubricating effect due to its low shear stress. Low-shear layered AgVO oxides provide lubrication at higher temperatures. However, these lubricating materials will have their own problems when ...

AI Technical Summary

Problems solved by technology

However, these lubricating materials will have their own problems when used alone in a wide temperature range: graphite will oxidize and fail under medium and high temperature conditions; under low temperature conditions, the Ag friction coefficient is large; Oxide has a large friction coefficient at low temperature

However, the co-deposition of multiple components / phases is often affected by the joint action of kinetics and thermodynamics, and the microstructure design and control are very complicated.

More importantly, it is difficult to balance the mechanics and lubricity of the coating: if there are more lubricating phases, the mechanical properties of the coating will deteriorate, but if there are few lubricating phases, the lubricating properties of the coating will not meet the requirements

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