Carbide-reinforced CoCrNi-based medium-entropy alloy and preparation method thereof

By adding Mo and B4C or TiC to CoCrNi to prepare a carbide-enhanced CoCrNi medium-entropy alloy, the problem of insufficient room temperature strength and corrosion resistance is solved, and the hardness and corrosion resistance is significantly improved. It is suitable for marine gas turbine devices in high temperature and high pressure environments.

CN119710431AActive Publication Date: 2025-03-28NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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Patent Information

Application Number
CN202411933449.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-28
Estimated Expiration
2044-12-26

AI Technical Summary

Technical Problem

The room temperature strength of CoCrNi-based medium entropy alloy is low and has insufficient corrosion resistance, making it difficult to meet the high-temperature and high-pressure environmental needs of marine gas turbine devices.

Method used

Carbide-enhanced CoCrNi-based mid-entropy alloys were prepared by high vacuum arc smelting by adding 3 at.% of Mo element to CoCrNi and adding 1-9 at.% of B4C or TiC on the basis of it.

Benefits of technology

The hardness and corrosion resistance of the alloy are significantly improved, making it more suitable for marine gas turbine devices in high temperature and high pressure environments, and the preparation process is easy to industrialize.

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Abstract

The invention provides a carbide-enhanced CoCrNi-based medium-entropy alloy and a preparation method thereof. The chemical formula of the CoCrNi-based medium-entropy alloy is (CoCrNi) 97Mo (3-x) B4C / TiC, wherein the (CoCrNi) 97Mo3 part is metered by atomic percent; x is 1 to 9 at.%, and x represents B4C or TiC based on the atomic percent of (CoCrNi) 97Mo3. According to the preparation method of the medium-entropy alloy, the raw materials are mixed and then smelted through a vacuum smelting furnace. The carbide-enhanced CoCrNi-based medium-entropy alloy provided by the invention has excellent corrosion resistance and hardness, and the corrosion resistance and the hardness are greatly improved compared with those of a CoCrNi medium-entropy alloy.
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