Metallic glass composite gradient filter material and preparation method thereof

By combining Joule heating pre-fabrication of a dense transition layer with low-temperature solid-phase diffusion sintering, the problems of pore size adjustment of metal filter media and poor adhesion of glass coatings were solved, achieving high strength, corrosion resistance and high efficiency filtration of metal-glass composite filter media.

CN121846774APending Publication Date: 2026-04-14ZHEJIANG UNIV OF TECH +1
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Patent Information

Application Number
CN202610078718.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-21
Publication Date
2026-04-14

AI Technical Summary

Technical Problem

Existing metal filter media have shortcomings in terms of pore size adjustment and filtration accuracy. Furthermore, the poor adhesion between the glass coating and the metal substrate makes them prone to cracking and peeling, and difficult to maintain stability and corrosion resistance under complex working conditions.

Method used

A two-step composite process combining Joule heating pre-fabrication of a dense transition layer and low-temperature solid-state diffusion sintering is adopted. The instantaneous high temperature generated by Joule heating causes glass powder to react with the metal surface to form a zinc-chromium spinel layer, achieving chemical metallurgical bonding and forming a stable gradient structure through homogeneous bonding.

Benefits of technology

The interfacial bonding strength of the metal-glass composite filter media has been improved, ensuring the comprehensive optimization of filtration accuracy and flux, and enhancing its anti-stripping ability and corrosion resistance life under complex working conditions.

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Abstract

The invention belongs to the technical field of metal-based composite filter materials, and particularly relates to a metal glass composite gradient filter material and a preparation method thereof. The method comprises the following steps: 1) preparing glass slurry by taking a metal fiber felt as a base material, and coating the glass slurry on the surface of the metal fiber felt for surface drying to form a metal glass composite precursor; 2) connecting the metal glass composite precursor into a circuit system, electrifying to generate resistance heat, and performing Joule heat treatment to obtain a metal glass composite; and 3) coating the glass slurry on the surface of the metal glass composite body again, and then carrying out solid-phase sintering to obtain the metal glass composite gradient filter material with the gradient pore structure. Through cooperation of Joule thermal instantaneous metallurgical bonding and low-temperature solid-phase diffusion sintering, a stable gradient structure of metal-spinel-compact glass-porous glass is creatively constructed, and the interface bonding strength of heterogeneous materials is greatly improved; meanwhile, gradient pores are effectively formed, the filtering precision is greatly improved, and the filtering flux is guaranteed.
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