A multiphase material having a gradient interphase and a method of making the same

By constructing a gradient functional layer at the interface of multiphase materials, a smooth transition between mechanical modulus and chemical structure is achieved, the stress concentration problem at the heterogeneous interface is solved, and the interfacial bonding strength and overall mechanical properties of the materials are improved.

CN122302490APending Publication Date: 2026-06-30NANYANG JINNIU ELECTRIC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NANYANG JINNIU ELECTRIC
Filing Date
2026-04-13
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing multiphase materials are prone to debonding and delamination failure due to stress concentration caused by abrupt changes in physicochemical properties at heterogeneous interfaces. Furthermore, existing modification methods are insufficient to effectively alleviate stress concentration and achieve precise control of mechanical properties.

Method used

In the interface region between the first-phase material and the second-phase material, a gradient functional layer with continuously or quasi-continuously changing composition and properties is constructed. By introducing functional fillers, a gradual change in elastic modulus and coefficient of thermal expansion is formed, which reduces modulus mismatch and enhances interfacial bonding strength and load transfer efficiency.

Benefits of technology

It significantly improves the interfacial bonding strength and overall bending resistance of the material, enhances the structural stability of the material in complex service environments, and strengthens the mechanical properties and fatigue life of the material.

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Abstract

This invention relates to the technical field of materials science, and in particular to a multiphase material with a gradient interface phase and its preparation method, comprising a first phase material, a second phase material, and a gradient functional layer located at the interface between the two. The concentration of at least one substance in the gradient functional layer varies continuously or quasi-continuously from the region near the first phase to the region near the second phase. During preparation, a pre-formed layer containing a second-phase precursor and functional filler is first constructed on the surface of the first phase, and then combined with the second phase for molding. Physicochemical reactions allow the substances to penetrate and fuse across the interface, forming a gradient structure in situ. This application can eliminate performance abrupt changes at heterogeneous interfaces, effectively alleviate stress concentration, and suppress delamination failure. Through this design, the interfacial bonding strength and overall mechanical properties of the material are significantly improved, with bending strength increasing by up to 15.4%. It is applicable to various material systems and has strong prospects for industrial application.
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