A water-based coating for aluminum alloy die casting and a preparation method and application thereof

CN122343239APending Publication Date: 2026-07-07DONGGUAN ALUMINUM DEWANG HARDWARE PROD CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner: DONGGUAN ALUMINUM DEWANG HARDWARE PROD CO LTD
Filing Date: 2026-06-05
Publication Date: 2026-07-07

AI Technical Summary

Technical Problem

Existing aluminum alloy metal mold casting coatings use silica sol as a binder, resulting in short shelf life, easy gel failure, and difficulty in balancing high-temperature adhesion, demolding lubrication, and cost control.

Method used

Nano-glass powder is used to replace silica sol, combined with aluminum oxide, zircon powder, silicon carbide and hexagonal boron nitride as functional fillers, and polyvinyl alcohol is used as a temporary binder. By controlling the particle size and melting point, a stable water-based coating is formed, which reduces costs and improves storage stability.

Benefits of technology

It significantly extends the shelf life of the coating to more than 12 months, maintains high-temperature performance and release lubricity, reduces raw material costs, and forms a continuous glass phase at high temperatures to resist erosion by molten aluminum.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a water-based coating for aluminum alloy die casting and a preparation method and application thereof, and belongs to the technical field of casting coatings. The application utilizes aluminum oxide, zirconium powder, silicon carbide and hexagonal boron nitride to jointly form a functional filler system, the hexagonal boron nitride has a layered hexagonal lattice structure and provides excellent self-lubricity at high temperatures, the aluminum oxide, zirconium powder and silicon carbide are high-hardness heat-resistant particles and cooperatively resist aluminum alloy liquid erosion, the mullite powder is used as an inert aggregate and is used for replacing part of high-cost fillers to reduce the raw material cost of the coating; the nano glass powder is used as a high-temperature binder to replace traditional silica sol, the storage period is more than 12 months without gelation phenomenon, the storage stability of the water-based coating is significantly improved, and at the aluminum alloy pouring temperature, the nano glass powder is just molten and softened to form a continuous glass phase, effectively bonds the functional fillers to the surface of the mold and resists the aluminum liquid erosion.

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