High-purity ni-cr-nb intermediate alloy, and preparation process therefor and application thereof

By combining elemental chromium, niobium, nickel, and graphite with vacuum induction refining technology, a low-melting-point, high-purity Ni-Cr-Nb master alloy was prepared, solving the problem of high oxygen and nitrogen impurity content in the Ni-Cr-Nb master alloy and realizing efficient and low-cost high-temperature alloy preparation.

WO2026138671A1PCT designated stage Publication Date: 2026-07-02RESEARCH INSTITUTE OF ADVANCED MATERIALS (SHENZHEN) CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
RESEARCH INSTITUTE OF ADVANCED MATERIALS (SHENZHEN) CO LTD
Filing Date
2025-12-19
Publication Date
2026-07-02

AI Technical Summary

Technical Problem

Existing Ni-Cr-Nb master alloys have high levels of impurity elements such as oxygen and nitrogen during preparation, and existing methods may introduce new impurities or increase the difficulty of alloy preparation.

Method used

By using a composite of elemental chromium, niobium, nickel, and graphite, combined with vacuum induction and refining technologies, the alloy composition and smelting process are controlled to prepare a low-melting-point, high-purity Ni-Cr-Nb master alloy, avoiding the introduction of alumina impurities.

Benefits of technology

This method achieves oxygen and nitrogen content below 100 ppm and alloy melting point below 1400℃, reducing the difficulty of gaseous element removal in the preparation of high-temperature alloys, improving production efficiency and reducing production costs.

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Abstract

The present application relates to the technical field of intermediate alloy preparation, and relates to a high-purity Ni-Cr-Nb intermediate alloy, and a preparation process therefor and an application thereof. Raw materials for preparing the high-purity Ni-Cr-Nb intermediate alloy comprise 17%-35% of elemental chromium, 8%-16% of elemental niobium, 50%-75% of elemental nickel, and 0.04%-0.11% of graphite. The high-purity Ni-Cr-Nb intermediate alloy is completely different from Ni-Cr-Nb intermediate alloys obtained by an existing aluminothermic reduction or two-step method. In the present application, no impurity aluminum element is introduced, and the content of oxygen and the content of nitrogen both are below 100 ppm, thereby greatly reducing the difficulty of removing gaseous elements in the subsequent preparation of a high-temperature alloy. In addition, the Ni-Cr-Nb intermediate alloy has a relatively low melting point, which is below 1220°C.
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