A laser cladding gradient refractory high-entropy alloy coating with low crack sensitivity and a preparation method thereof

CN122214852APending Publication Date: 2026-06-16XIAN TECH UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAN TECH UNIV
Filing Date
2025-12-30
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

The refractory high-entropy alloy coating generates significant thermal stress during rapid solidification, resulting in poor adhesion between the coating and the substrate, easy peeling, and uneven microstructure, which affects practical applications.

Method used

The structure employs a matrix, an Nb transition layer, and a WMoTaNb-based alloy layer arranged sequentially. The Nb transition layer alleviates thermal stress abrupt changes and prevents element diffusion, forming a stable solid solution interface, avoiding the formation of brittle intermetallic compounds, and ensuring a single BCC structure.

Benefits of technology

It improves coating adhesion and overall performance, reduces equipment costs and debugging difficulty, achieves good microstructure and performance, eliminates the need for additional heat treatment, and shortens the production cycle.

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Abstract

The application discloses a laser cladding gradient refractory high-entropy alloy coating with low crack sensitivity and a preparation method thereof. The coating comprises a substrate, an Nb transition layer and a WMoTaNb-based alloy layer arranged in sequence, the Nb transition layer is used for avoiding cracks caused by thermal stress mutation of the WMoTaNb-based alloy layer and for preventing diffusion of elements in the substrate to the WMoTaNb-based alloy layer. In particular, the WMoTaNb-based alloy layer and the Nb transition layer form a stable solid solution interface, no brittle intermetallic compound is generated, a single BCC structure is combined with the Nb transition layer, and the dual goals of 'no crack + high hardness' are achieved.
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