Preparation method of high-strength nanocrystalline type medical Beta titanium alloy for orthopaedic implanting

A β-titanium alloy and nanocrystalline technology, which is applied in the field of preparation of high-strength nanocrystalline medical β-titanium alloy, can solve the problems of low plasticity of non-toxic medical titanium alloy nanomaterials, cancer-induced senile dementia, elastic modulus mismatch, etc. , to achieve the effects of increasing phase transition induced stress, short aging time and low production cost

Active Publication Date: 2013-04-03
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium alloy materials still have the following problems: 1. After the above-mentioned titanium alloy is implanted into the human body for a long time, it will release Al ions, V ions and Ni ions in it due to friction and corrosion, which is toxic to human cells and nerves, and induces cancer and Alzheimer's disease
2. The elastic modulus is too high and does not match the elastic modulus of human bone. The elastic modulus of Ti-6Al-4V and Ti-6Al-7Nb alloys are more than 2 times that of human bone, and the resulting stress shielding It is easy to lead to bone resorption and implant loosening; 3. Poor shape memory performance greatly limits the application of Ti-6Al-4V, Ti-6Al-7Nb and other alloys as biomedical materials to a certain extent
[0010] In summary, the non-toxic medical titanium alloy nanomaterials prepared by the current technology have low plasticity, poor processing performance, and low preparation efficiency, and are in the stage of laboratory research and development.

Method used

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  • Preparation method of high-strength nanocrystalline type medical Beta titanium alloy for orthopaedic implanting
  • Preparation method of high-strength nanocrystalline type medical Beta titanium alloy for orthopaedic implanting
  • Preparation method of high-strength nanocrystalline type medical Beta titanium alloy for orthopaedic implanting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation process of this example is as follows: according to the weight percentage, Nb13; Mo7; Sn4; Ti balance is weighed, and the Ti is divided into three parts and respectively mixed with Nb element, Mo element and Sn element in a vacuum melting furnace to obtain a Ti-Nb alloy , Ti-Mo alloy and Ti-Sn alloy; then put the obtained Ti-Nb alloy, Ti-Mo alloy and Ti-Sn alloy together to evacuate and then fill with argon protection, and repeat the melting five times in the vacuum melting furnace , in a water-cooled copper mold for instant suction casting, to obtain an alloy sheet with an average grain size of less than 10 μm and a thickness of 5 mm; the cooling rate of the rapid solidification treatment of the mold cooling method is 10 6 K / s; Then, the alloy sheet obtained by the rapid solidification treatment is rolled at a low temperature of -140°C in a twin-roll mill under liquid nitrogen cooling, and the rolling strain rate is 5s-1, and it is directly rolled to the...

Embodiment 2

[0051] The preparation process of this example is as follows: Different from Example 1, the alloy sheet obtained by the rapid solidification treatment is rolled at a low temperature by a twin-roll mill under liquid nitrogen cooling, and is directly rolled to a thickness of 0.5mm sheet (deformation is 90%), the grain size is about 40 nanometers; the alloy after low-temperature cold treatment is aged at 823K for 200s, and the average grain size of the final nanocrystalline titanium alloy is about 45 nanometers ( Figure 6 , Figure 7 ), the strength is 1450MPa, and the plasticity is 17% ( Figure 8 ), the elastic modulus is 47GPa, and the hyperelastic recovery strain is 4.4% ( Figure 9 ).

Embodiment 3

[0053] The preparation process of this example is as follows: Different from Example 1, the alloy sheet obtained by the rapid solidification treatment is rolled at a low temperature by a twin-roll mill under liquid nitrogen cooling, and is directly rolled to a thickness of 0.65mm sheet (87% deformation), the grain size is about 20-50 nanometers; the alloy after low-temperature cold treatment is aged at 923 for 250s, and finally the nanocrystalline titanium alloy is prepared with an average grain size of about 45 nanometers and high strength. It is 1340MPa, and the plasticity is 20% ( Figure 10 ), the elastic modulus is 41GPa, and the hyperelastic recovery strain is 4.1% ( Figure 11 ).

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Abstract

The invention discloses a preparation method of a high high-strength nanocrystalline type medical Beta titanium alloy for orthopaedic implanting. The titanium alloy is the Ti-Nb-Mo-Sn alloy prepared by the following steps in sequence: treating the alloy ingredients in a vacuum arc melting furnace, and sequentially carrying out the processes of quickly solidifying, rolling at a low temperature and instantaneously ageing at a high temperature, thus obtaining the large-dimension nanocrystalline type titanium alloy. The alloy has the average crystalline dimension less than 60 nanometers, and has strength of 1200 to 1600MPa, plasticity of 15 to 20%, elasticity modulus of 40 to 60 GPa, and super-elasticity recovery strain of 4 to 5%. According to the preparation method, the treatment processes of quick solidifying, low-temperature rolling and instantaneous ageing are creatively combined to treat the titanium alloy, thus, the purpose of unifying high strength, excellent processing performance, low elasticity modulus and excellent super-elasticity performance is realized, and high technological effect and huge potential economic value are brought.

Description

technical field [0001] The invention relates to a method for preparing materials in the field of medical devices, in particular to a method for preparing a high-strength nanocrystalline medical β titanium alloy for orthopedic implantation. Background technique [0002] With the improvement of human living standards and the development of science and technology, the society's demand for human implanted hard tissue materials is getting higher and higher. Titanium alloy has excellent human compatibility, high specific strength, and good corrosion resistance. It gradually replaces medical stainless steel and cobalt-based alloys as hard tissue replacement materials, such as artificial hips, knees, shoulders, ankles, elbows, wrists, and knuckles. Joints, intramedullary nails, steel plates, screws and other bone trauma products, dental implants, brackets, orthopedic wires, spinal orthopedic internal fixation systems, artificial heart valves, and interventional cardiovascular stents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C14/00C22F1/18
Inventor 林建国张德闯
Owner XIANGTAN UNIV
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