A high-stability precision resistance alloy and its preparation method

By using a high-stability precision resistance alloy composed of Ni, Cr, Al, Cu, and Zr, combined with metastable deformation and gradient cooling treatment, the problem of resistivity instability of Evan alloy during high-temperature service was solved, achieving the effect of high stability and small resistance change.

CN121472649BActive Publication Date: 2026-05-26HEFEI GEWU NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN ¡ China
Patent Type
Patents(China)
Current Assignee / Owner
HEFEI GEWU NEW MATERIAL TECHNOLOGY CO LTD
Filing Date
2026-01-11
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

During long-term high-temperature service, the metastable strengthening phases in the microstructure of traditional Evan alloys will coarsen, transform, or dissolve, resulting in unstable resistivity and failing to meet the performance requirements of high-precision reference resistors and long-term service sensors.

Method used

A high-stability precision resistance alloy composed of Ni, Cr, Al, Cu, and Zr is used. By controlling the Zr content and introducing metastable deformation and gradient cooling treatment, the chromium atom cluster structure is stabilized, thereby improving the annual stability of the alloy.

Benefits of technology

It significantly improves the stability of the alloy, with a resistance change of less than 1%, meeting the long-term service requirements under extreme environments such as high temperature and high humidity.

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Abstract

This invention belongs to the field of high-precision resistive material preparation and processing technology, specifically relating to a novel high-stability precision resistive alloy and its preparation method. Addressing the problem that existing precision resistive alloys, during long-term high-temperature service, experience coarsening, transformation, or dissolution of metastable strengthening phases in the alloy's microstructure under long-term thermodynamic driving, leading to unstable resistivity, this invention employs the following technical solution: a novel high-stability precision resistive alloy, with the following elemental mass percentages: 19.75~22.42% Cr, 2.84~3.75% Al, 2.72~3.24% Cu, 0.57-1.87% Zr, with the balance being Ni. The preparation method includes: raw material preparation; melting and casting to obtain the as-cast alloy; forging and billet preparation; preheating followed by four passes of hot rolling; annealing; preheating followed by metastable deformation treatment; gradient cooling; and surface degreasing. The novel precision resistive alloy prepared by this invention exhibits higher annual stability.
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