Wide-temperature-range modified phosphate-based self-lubricating coating as well as preparation method and application thereof

By combining modified chromium aluminum phosphate adhesive with fillers, a stable three-dimensional network structure was constructed, which solved the problem of insufficient lubrication and anti-corrosion performance of self-lubricating coatings under high temperature conditions, and achieved stable lubrication and anti-oxidation effects over a wide temperature range.

CN122080671APending Publication Date: 2026-05-26LANZHOU INSTITUTE OF CHEMICAL PHYSICS CHINESE ACADEMY OF SCIENCES +1
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Patent Information

Application Number
CN202610089040.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-22
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing self-lubricating coatings are difficult to maintain good lubrication and corrosion resistance under high temperature conditions, and cannot meet the service requirements under high temperature and complex working conditions.

Method used

By preparing a modified chromium aluminum phosphate adhesive, introducing fumed silica and boron oxide, a stable three-dimensional network structure is constructed. Combined with various lubricating and anti-corrosion fillers, a wide-temperature-range modified phosphate-based self-lubricating coating is formed.

Benefits of technology

It maintains good lubrication and friction reduction effects over a wide temperature range from room temperature to 800°C, and has excellent oxidation and corrosion resistance, meeting the service requirements under high temperature and complex working conditions.

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Abstract

The invention provides a wide-temperature-range modified phosphate-based self-lubricating coating and a preparation method and application thereof.The method comprises the steps that a CrO3 solution is added into polyphosphoric acid at the temperature of 90 DEG C in a stirring state, Al (OH) 3 is added in batches, stirring continues to be conducted for 2-3 h, cooling is conducted to the room temperature, and a chromium-aluminum phosphate adhesive is obtained; the preparation method comprises the following steps: heating a chromium-aluminum phosphate adhesive to 110-120 DEG C, adding fumed silica, stirring, and adding B2O3 in batches to obtain a modified chromium-aluminum phosphate adhesive; preparation of the wide-temperature-range modified phosphate-based self-lubricating coating: uniformly mixing the modified chromium-aluminum phosphate adhesive with silica sol, and adding deionized water and filler to obtain the wide-temperature-range modified phosphate-based self-lubricating coating. The wide-temperature-range modified phosphate-based self-lubricating coating is sprayed on the surface of a matrix and sintered to form the wide-temperature-range modified phosphate-based self-lubricating coating. The self-lubricating coating provided by the invention can be applied to the field of self-lubricating and corrosion prevention in a wide temperature range from room temperature to 800 DEG C.
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