Preparation method of high-melting-point-difference alloy powder for 3D printing

CN119346880AActive Publication Date: 2025-01-24ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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Patent Information

Application Number
CN202411485486.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-23
Publication Date
2025-01-24
Estimated Expiration
2044-10-23

AI Technical Summary

Technical Problem

When preparing difficult-to-melting high-entropy alloy rod materials, the melting point difference between the alloy components is large, resulting in the cast rod materials being prone to component segregation, cracks, looseness and other defects, affecting the preparation effect and alloy performance.

Method used

Using powder metallurgy-plasma step-by-step alloying method, elemental elements with lower mixing enthalpy are alloyed through hot pressing sintering or hot isostatic pressing sintering, and then secondary alloying is performed using plasma rotating electrode atomization to form complete alloying of powder.

Benefits of technology

The uniformity and controllability of the tissue of the difficulty of melting high entropy alloy powder, avoiding the burning or evaporation of the low melting point elements, improved the spherical and liquidity of the powder, reducing the appearance of hollow powder and satellite powder. , Suitable for 3D printing.

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Abstract

The invention relates to the technical field of high-entropy alloy, and discloses a preparation method of high-melting-point-difference alloy powder for 3D printing, which comprises the following steps: step 1, powder metallurgy semi-alloying: alloying simple substance elements with lower mixing enthalpy by utilizing a hot pressing sintering or hot isostatic pressing sintering mode; and step 2, plasma complete alloying: carrying out secondary alloying on the alloyed element and the high-melting-point elementary substance element by utilizing a plasma rotating electrode atomization mode. According to the technical scheme, the problem of high melting point difference is solved, in-situ alloying of part of elements of low-melting-point elements and adjacent high-melting-point elements is achieved in a powder metallurgy mode, and intermediate alloy is formed; and under the action of plasma energy, the intermediate alloy in the bar and the adjacent higher-melting-point element are alloyed, so that burning loss or evaporation of the low-melting-point element due to too high temperature or energy is avoided, and uniform structure and controllable components of the refractory high-entropy alloy powder are realized.
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Citation Information

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