A method for preparing a TC4 medical titanium alloy low-gap large ingot-shaped high-performance casting ingot

By using high-purity treatment of sponge titanium and a three-stage self-consumable melting process, the problems of compositional segregation and coarse structure in large TC4 medical titanium alloy ingots have been solved, achieving high-performance and high-yield ingot preparation, suitable for orthopedic implants and dental implants.

CN122189407APending Publication Date: 2026-06-12SHENYANG ZHJH SPECIAL METAL MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENYANG ZHJH SPECIAL METAL MATERIALS CO LTD
Filing Date
2026-05-15
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

Existing technologies struggle to effectively control the low interstitial density and high performance of large-sized TC4 medical titanium alloy ingots. In particular, during the smelting and solidification processes, compositional segregation, coarse microstructure, and metallurgical defects can easily occur, leading to substandard material purity and mechanical properties.

⚗Method used

The method employs high-purity treatment of sponge titanium, vacuum induction melting, and three-stage consumable melting, including physical pre-cleaning, chemical directional washing, vacuum gradient heat treatment, and particle morphology control. Combined with LIBS real-time composition detection and electromagnetic stirring, the melting parameters are optimized to control the temperature field and grain size.

🎯Benefits of technology

Achieving high yield and excellent mechanical properties for low-gap, large-slab TC4 medical titanium alloy ingots, reducing impurity content, improving compositional uniformity, and meeting the requirements for tensile strength and elongation in medical implants.

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Abstract

The application belongs to the technical field of titanium alloy material preparation, and relates to a preparation method of a TC4 medical titanium alloy low-interstice large-ingot high-performance ingot. Through four-step processing of "physical pre-cleaning-chemical directional washing-vacuum gradient heat treatment-particle morphology regulation", the application solves the problems of low-melting-point impurities (Mg and MgCl2), residual chlorine and uneven distribution of oxygen and nitrogen of raw material titanium sponge produced by a magnesium-reduced titanium tetrachloride process; on the basis of the original "vacuum induction melting + electromagnetic stirring + rapid solidification", the application adds an on-line composition monitoring and dynamic feeding link to solve the composition segregation problem of Al-V intermediate alloy; in the three-time melting, the stirring from low frequency to high frequency and the cooling rate gradient of greater than or equal to 60 DEG C / s are controlled to control the defects of the large-ingot TC4 medical titanium alloy through fine-grain and final homogenization; and finally, the TC4 medical titanium alloy low-interstice large-ingot high-performance ingot is obtained.
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