Steel-aluminum composite plate with solid-liquid interface eutectic and preparation method thereof

CN122275385APending Publication Date: 2026-06-26GUIZHOU HUAJUN ALUMINUM TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU HUAJUN ALUMINUM TECH CO LTD
Filing Date
2026-05-06
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies cannot generate a dense, integrated eutectic transition layer in steel-aluminum composite panels. Gaps and oxide inclusions are easily left at the interface, resulting in low shear strength and easy delamination and cracking at high temperatures. This fails to meet the high strength and high-temperature stability requirements of industrial composite panels.

Method used

By adopting a multi-element alloy design and adding Zn, Si, Pb, Cu and Mg components, combined with oxygen-free preheating, direct solid-liquid casting and rolling of electrolytic aluminum liquid and rapid cooling, a Fe2Al5, FeAl3 and FeAl gradient eutectic layer is formed. Through precise control of atomic diffusion and grain refinement, oxide inclusions are eliminated and metallurgical bonding is achieved.

Benefits of technology

It improves the shear strength, peel strength and high temperature stability of steel-aluminum composite panels. The shear strength is ≥90MPa at room temperature, the peel strength is ≥155N/mm, the shear strength is still ≥85MPa after high temperature of 300℃, and the elongation after fracture is >15%, which can adapt to long-term stable service under alternating high and low temperature conditions.

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Abstract

This invention relates to the field of bimetallic composite materials, and more particularly to a steel-aluminum composite plate with a solid-liquid interface eutectic structure. The plate comprises a base layer made of an aluminum alloy plate, with steel plates forming cladding layers above and below the base layer, and a eutectic layer between the base layer and the cladding layers. The aluminum alloy plate contains the following components by mass percentage: Zn 4.1-5.4%, Si 0.7-1.2%, Pb 0.8-1.4%, Cu 0.9-1.2%, Mg 0.2-0.4%, with the balance being Al and unavoidable impurities ≤0.06%. This invention also relates to a method for preparing the steel-aluminum composite plate with a solid-liquid interface eutectic structure, which achieves good interfacial bonding and excellent performance, and is inexpensive to prepare.
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Citation Information

Patent Citations

  • High-performance copper-aluminum interface eutectic composite material and preparation method thereof

    CN117227274A