Black TiO2 / Fe-based medium-entropy alloy composite coating with antibacterial and degradation properties

By spraying Fe-based medium-entropy alloy onto the substrate surface and filling the pores with black TiO2 sealing agent to form a composite coating, the problem of existing antibacterial materials killing bacteria and degrading organic pollutants under visible and near-infrared light is solved, achieving efficient and broad-spectrum antibacterial and degradation effects.

CN118147568BActive Publication Date: 2026-07-24LANZHOU UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LANZHOU UNIVERSITY OF TECHNOLOGY
Filing Date
2024-01-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing antibacterial materials are difficult to effectively kill bacteria and degrade organic pollutants under visible and near-infrared light, and lack broad-spectrum antibacterial effects.

Method used

A Fe-based medium-entropy alloy coating was sprayed onto the substrate surface using plasma spraying, and its pores were filled with a black TiO2 sealing agent to form a Fe-based medium-entropy alloy/black TiO2 composite coating. The antibacterial effect of the metal ions of the Fe-based medium-entropy alloy and the photocatalytic active oxygen free radicals of the black TiO2 were used to synergistically improve the antibacterial effect and degrade organic pollutants.

Benefits of technology

It achieves broad-spectrum antibacterial effects under both natural light and dark conditions, and can quickly kill bacteria such as Staphylococcus aureus and Escherichia coli, while also having the function of degrading organic pollutants.

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Abstract

The application discloses a black TiO2 / Fe-based medium-entropy alloy composite coating with antibacterial and degradation properties, which is composed of a Fe-based medium-entropy alloy coating and a black TiO2 sealing agent. The Fe-based medium-entropy alloy coating is sprayed on the surface of a substrate by a plasma spraying technology, and the porosity of the coating is 2.25% to 4.88%. The black TiO2 sealing agent prepared by a sol-gel method is used to seal the pores of the Fe-based medium-entropy alloy coating, thereby reducing the porosity of the coating and making the coating more compact. The Fe-based medium-entropy alloy coating has the antibacterial property of metal ions, and the black TiO2 sealing agent also has the photocatalytic effect under sunlight and near-infrared light, can produce a synergistic effect with the metal ions, and more efficiently improves the antibacterial effect of the coating. In addition, due to the photocatalytic activity of the black TiO2 sealing agent, the composite coating also has the function of degrading organic pollutants.
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Citation Information

Patent Citations

  • CN104005072A

  • CN116479341A