Low-modulus medical titanium alloy and preparation method thereof

A titanium alloy, low modulus technology, applied in the field of metallurgy, can solve the problems of low strength of titanium alloy, small superelastic recovery, difficult smelting and casting processing, etc., and achieves improved superelasticity, low Young's modulus, good The effect of cold workability

Active Publication Date: 2017-02-22
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a low-modulus medical titanium alloy and its preparation method. The low-modulus medical titanium alloy and its preparation method should solve the problem of titanium alloy in the prior art. The technical problems of low alloy strength, small superelastic recovery, and difficult smelting and casting processing

Method used

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  • Low-modulus medical titanium alloy and preparation method thereof
  • Low-modulus medical titanium alloy and preparation method thereof
  • Low-modulus medical titanium alloy and preparation method thereof

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Embodiment 1

[0051] Ti with a purity of ≥99.95%, Cr with a purity of ≥99.95%, and Nb with a purity of ≥99.95% are used as raw materials, and an alloy ingot with a molar percentage of 22% Nb, 2% Cr, and the balance of Ti is prepared by high vacuum arc melting . The ingot was homogenized and annealed at 1000°C for 10 hours, followed by solid solution at 850°C for 1 hour, and cold rolled at room temperature by about 90%. The sheet obtained by cold rolling was annealed at 800°C for 1 hour and then quenched as the final test sample state. In this state, the alloy is a single β phase, the Young's modulus measured by nanoindentation is 56.4GPa, the tensile strength measured by static load tensile method is about 568MPa, and the superelastic recovery is about 2.8%.

Embodiment 2

[0053] Ti with a purity of ≥99.95%, Cr with a purity of ≥99.95%, and Nb with a purity of ≥99.95% are used as raw materials, and an alloy ingot with a molar percentage of 10% Nb and 8% Cr with a balance of Ti is prepared by high vacuum arc melting. The ingot was homogenized and annealed at 950°C for 10 hours, then solidified at 850°C for 1 hour, and pulled out at room temperature to obtain a titanium alloy wire with a final diameter of about 1.0mm. After the wire was annealed at 800°C for 1 hour, the final test sample was taken state. The tensile strength obtained by tensile test of the alloy in this state is about 761MPa, the elongation is about 18%, and the Young's modulus is 56.4GPa.

Embodiment 3

[0055] Ti with a purity ≥99.95%, Cr with a purity ≥99.95%, Nb with a purity ≥99.95% and Sn with a purity ≥99.95% are used as raw materials, and the mole percentage is 12% Nb, 2% Cr, 1% Sn prepared by high vacuum arc melting , Alloy ingot with the balance being Ti. The ingot was homogenized and annealed at 1000°C for 10 hours, followed by solid solution at 900°C for 1 hour, and cold-rolled 90% at room temperature. After annealing the thin sheet obtained by cold rolling at 800°C for 1 hour, it was aged at 200°C for 1 hour as the final test sample state. The alloy in this state has a Young's modulus of 65.3GPa measured by nanoindentation, a tensile strength of about 710MPa, and an elongation of about 14%.

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Abstract

The invention discloses low-modulus medical titanium alloy comprising Nb with the molar concentration of 10-25%, Cr with the molar concentration of 1-8%, Sn with the molar concentration of 0-2% and the balance Ti. The invention further provides a preparation method of the low-modulus medical titanium alloy. The method includes the steps that under the argon protection atmosphere condition, a cast ingot is subjected to homogenizing annealing; solution treatment is conducted under the vacuum condition, and then the cast ingot is placed in water for quenching; cold machining forming is conducted at room temperature; a sample obtained after cold machining forming is re-crystallized and annealed under the vacuum condition, wherein re-crystallization and annealing temperature is 700-900 DEG C, time lasts for 0.5-2 h and a cooling mode is water quenching or ice water quenching; the low-modulus medical titanium alloy is obtained. The titanium alloy has good cold machining performance, and is high in strength, low in Young modulus, good in corrosion resistance and biocompatibility and suitable for the medical fields like bone implantation.

Description

technical field [0001] The invention belongs to the field of metallurgy, and relates to a metal material preparation and processing technology, in particular to a low-modulus medical titanium alloy and a preparation method thereof. Background technique [0002] Titanium and titanium alloys have the characteristics of high specific strength, low elastic modulus and good corrosion resistance, especially excellent biocompatibility, and have gradually become ideal functional structural materials for human hard tissue repair and replacement in clinical medicine. . At present, titanium alloys such as Ti-6Al-4V and Ni-Ti are widely used in medicine. After long-term implantation, the released Al, V, and Ni plasmas are toxic or cause allergic reactions in the human body; their elastic modulus is too high, which is incompatible with human bone Mismatch, which in turn creates stress shielding and results in unsatisfactory implantation. β-type titanium alloy has lower Young's modulus ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22F1/18C22F1/02
CPCC22C14/00C22F1/002C22F1/02C22F1/183
Inventor 李强马广昊付振闯刘旭燕潘登
Owner UNIV OF SHANGHAI FOR SCI & TECH
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