A high-uniformity large-size Ti-6Al-7Nb medical titanium alloy ingot and a preparation method thereof

By pretreating high-purity sponge titanium, designing a Ti-Al-Nb ternary intermediate alloy, and employing a three-stage VAR melting process, the problems of niobium segregation and coarse grains in large-size Ti-6Al-7Nb medical titanium alloy ingots were solved, achieving the preparation of ingots with high uniformity and high purity, thus meeting the high stability requirements of medical materials.

CN122189534BActive Publication Date: 2026-07-21SHENYANG ZHJH SPECIAL METAL MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENYANG ZHJH SPECIAL METAL MATERIALS CO LTD
Filing Date
2026-05-14
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

The preparation of large-size Ti-6Al-7Nb medical titanium alloy ingots suffers from problems such as niobium segregation, coarse grains, numerous inclusions, and poor batch stability, which are difficult to effectively solve with existing technologies.

Method used

By employing high-purity sponge titanium pretreatment, Ti-Al-Nb ternary master alloy design, trace boron addition, and precise segregation control through three VAR melting processes, the process involves high-purity sponge titanium vacuum high-temperature degassing, preparation of Ti-20Al-30Nb ternary pre-alloy master alloy, electrode pressing, and three VAR melting processes. This achieves the full dissolution and uniform distribution of niobium, refines the grains, and eliminates inclusions.

Benefits of technology

The composition of large-size Ti-6Al-7Nb medical titanium alloy ingots is highly uniform, the microstructure is fine and dense, and the batch stability is excellent, meeting medical standards and significantly improving the uniformity and purity of the material.

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Abstract

The application belongs to the technical field of high-end biomedical metal material preparation, and particularly relates to a high-uniformity large-size Ti-6Al-7Nb medical titanium alloy ingot and a preparation method thereof. Through synergistic control of "high-purity sponge titanium pretreatment + Ti-Al-Nb ternary intermediate alloy design + trace boron addition grain refinement + three-time VAR melting precise segregation control", the application realizes the deep integration of material design of pre-alloying and micro-alloying and three-time VAR + EMS melting process, simultaneously starts from two aspects of thermodynamics and dynamics, ensures that niobium element is fully dissolved in the melting stage and uniformly distributed in the solidification stage, and realizes the requirements of high uniformity of ingot composition, small and compact structure and excellent batch stability. The whole-process high-cleanliness control of the application ensures that the oxygen content is less than or equal to 0.10wt%, and there is no harmful inclusion larger than 15 microns, thereby meeting the most stringent medical standards.
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