A molybdenum disulfide quantum dot friction-reducing coating, a preparation method and application thereof

By spin-coating a molybdenum disulfide quantum dot coating onto a steel substrate and utilizing friction-induced self-assembly to form a layered lubricating film, the problems of unstable lubrication performance and insufficient bonding strength in existing technologies are solved, achieving ultra-low friction and stability in steel-steel friction pairs, which is suitable for fields such as machinery manufacturing, automobiles, and aerospace.

CN122124966APending Publication Date: 2026-06-02LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES
Filing Date
2026-02-12
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies in metal friction pairs (such as steel-steel pairs) often fail to achieve both lubrication performance and stability, especially under dry or harsh friction conditions. Traditional methods are complex, costly, and have insufficient coating bonding strength, making it difficult to achieve ultra-low and stable friction.

Method used

Molybdenum disulfide quantum dots are used to form a coating on the surface of a steel substrate by spin coating. The coating is formed by in-situ structural evolution and self-assembly during the friction process to form a continuous layered lubricating film, thereby achieving ultra-low friction.

Benefits of technology

The friction coefficient of steel-steel friction pairs was reduced to below 0.005 under dry conditions, exhibiting a super-lubricated state and maintaining excellent stability under high loads. The process is simple, low-cost, and suitable for large-scale applications.

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Abstract

This invention discloses a molybdenum disulfide quantum dot anti-friction coating, its preparation method, and its application, belonging to the field of solid lubrication technology. The coating is formed on a steel substrate surface by spin coating of molybdenum disulfide quantum dots with an average particle size of less than 10 nm, with an initial dry film thickness of 1-30 μm. The core of this invention lies in the fact that during sliding friction under dry conditions, the quantum dots within the coating undergo in-situ structural evolution, self-assembling to form a continuous layered molybdenum disulfide lubrication transfer film with a thickness of 10-50 nm. This lubricating film can reduce the steady-state friction coefficient of steel-steel friction pairs to approximately 0.004, achieving a super-lubricating state, reducing friction by more than 98% compared to the uncoated state. This invention also provides a simple preparation method including suspension preparation and spin coating film formation, as well as a method for applying this coating to steel-steel friction pairs to achieve super-lubricating friction reduction. This invention features a simple process, low cost, significant and stable lubrication effect, and is suitable for high-load dry friction conditions.
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