NiTiNb shape memory alloy and preparation method thereof

By using cold mold pressing and sintering methods in the preparation process of NiTiNb alloy, the problems of impurity pollution and eutectic liquid phase loss are solved, and the composition uniformization and densification of the alloy are achieved, which significantly improves its mechanical properties and shape memory effect.

CN119843091AActive Publication Date: 2025-04-18CENT SOUTH UNIV
View PDF 3 Cites 4 Cited by

Patent Information

Application Number
CN202411422607.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-10-12
Publication Date
2025-04-18
Estimated Expiration
2044-10-12

AI Technical Summary

Technical Problem

During the preparation process, NiTiNb alloy has impurity contamination and the generation and loss of mixed eutectic liquid phase, resulting in poor performance and difficult to meet the needs of engineering applications and biomedical fields.

Method used

By uniformly mixing Ni, Ti and Nb sources, cold-molding molding is performed, and then sintering is regulated in a vacuum system. The sintering parameters include gradual heating and insulation to control the volume fraction and distribution of the eutectic liquid phase and promote element diffusion and densification.

Benefits of technology

The composition homogenization and matrix densification of NiTiNb alloy are achieved, which significantly improves the mechanical properties and shape memory effects of the alloy, and the oxygen content and carbon content are also effectively controlled.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN119843091A_ABST
    Figure CN119843091A_ABST
Patent Text Reader

Abstract

The invention provides a NiTiNb shape memory alloy and a preparation method thereof, and the preparation method specifically comprises the following steps: (1) uniformly mixing a Ni source, a Ti source and a Nb source to obtain mixed powder; (2) carrying out cold mold compression molding on the mixed powder to obtain an alloy green body; and (3) the green body is sintered, and the NiTiNb shape memory alloy is obtained. According to the preparation method disclosed by the invention, the NiTiNb alloy with uniform components and high density can be prepared by introducing Nb source powder for sintering and regulating and controlling sintering temperature parameters, so that the strength of the NiTiNb alloy is improved to 1600 MPa or above, the density of the alloy is improved to 92%, the compression strength is higher than 2000 MPa, the fracture strain is higher than 30%, the 8% tensile recovery rate is higher than 50%, and the mechanical property of the alloy is greatly improved.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Porous NiTiNb superelastic alloy with low strain hysteresis and preparation method of alloy

    CN104630525A

  • NiTiNb shape memory alloy and preparation method thereof

    CN105132749A

  • Preparation method of low-cost element mixed NiTi shape memory alloy through high-temperature homogenization treatment

    CN115386755A

Cited By

  • Electron beam additive manufacturing method of NiTiNb shape memory alloy

    CN120839231A

  • NiTiNb shape memory alloy and preparation method thereof

    CN121428346A

  • NiTiNb Shape Memory Alloy and Its Preparation Method

    CN121428346B

  • Nitinb shape memory alloy and preparation method therefor

    WO2026077444A1