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A kind of low modulus, high anti-corrosion ternary ni-ti-cu alloy and preparation method thereof

A ni-ti-cu, low-modulus technology, applied in the field of biomaterials, can solve the problems that the fracture toughness of materials cannot meet the requirements of use, size restrictions, and high equipment costs, reduce size and quantity, reduce material waste, and improve. The effect of mechanical properties

Active Publication Date: 2016-08-17
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Claims
  • Application Information

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Problems solved by technology

Although strip technology is a good alternative to traditional casting to prepare alloys, it still has some shortcomings: ①The size of the material it can prepare is very limited (only strips) ; ② The fracture toughness of the prepared material is difficult to meet the requirements of use; ③ The cost of equipment is high

Method used

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  • A kind of low modulus, high anti-corrosion ternary ni-ti-cu alloy and preparation method thereof
  • A kind of low modulus, high anti-corrosion ternary ni-ti-cu alloy and preparation method thereof
  • A kind of low modulus, high anti-corrosion ternary ni-ti-cu alloy and preparation method thereof

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Embodiment approach 1

[0020] The low modulus and high corrosion resistance alloy of the present invention is composed of Ni, Ti and Cu, wherein the atomic ratio of Ti element is 49%, the atomic ratio of Ni element is 26%, and the atomic ratio of Cu element is 25%.

[0021] 1. Convert the samples of three kinds of Ni, Ti, Cu pure metals into weight percentage according to atomic percentage, cut and weigh the required amount. Then place it in an acetone solution for ultrasonic cleaning for 30 minutes to remove pollutants on the surface of raw materials;

[0022] 2. Wipe the inside and bottom crucible of the electric arc furnace clean with acetone, and place the weighed metal raw materials in the crucible;

[0023] 3. Use the mechanical pump to pump the cavity of the arc melting equipment to a vacuum higher than 6 Pa, then turn on the molecular pump and continue vacuuming until the vacuum reaches 5 × 10 -5 Above Pa.

[0024] 4. Introduce argon gas to control the pressure of the vacuum chamber at ab...

Embodiment approach 2 3

[0027] The difference between this embodiment and the first embodiment is that the diameters of the cylindrical samples in step 5 are 5 mm and 2 mm respectively, and the rest of the steps are the same as those of the first embodiment.

[0028] attached by figure 1 It can be seen that the precipitated phase size of the cylindrical sample with a diameter of 2 mm is smaller. This is due to the higher cooling rate during solidification of cylindrical specimens with smaller diameters, resulting in microstructure refinement. In this way, samples with finer microstructures have better mechanical properties in comparison.

[0029] The XRD pattern of the alloy shows that, see attached figure 2 , the main phase composition of all samples is austenite phase at room temperature, and the half width of the diffraction peaks increases with the decrease of the sample size, which proves that the alloy microstructure can be improved at a higher cooling rate The refinement phenomenon below. ...

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Abstract

The invention discloses a low-modulus, high-corrosion-resistant ternary Ni-Ti-Cu alloy and a preparation method thereof. Its main technical scheme is: Ni-Ti-Cu alloy prepared under the conditions of adding Cu element and rapid solidification 26 Ti 49 Cu 25 The elastic modulus of the alloy is around 60 GPa. The present invention has the following beneficial effects: the cooling rate of the present invention using the water-cooled copper crucible method is much lower than other rapid cooling conditions (strip technology), and it is easier to realize in actual industrial production; Cu can play a passivation role on the alloy surface , thereby improving the corrosion resistance of the alloy. In addition, the Cu of the ternary Ni‑Ti‑Cu alloy can be slowly released from the vascular stent, which can play a good role in reducing restenosis symptoms after heart valve surgery.

Description

technical field [0001] The invention relates to the technical field of biomaterials, in particular to a low-modulus, high-corrosion-resistant ternary Ni-Ti-Cu alloy and a preparation method thereof. Background technique [0002] Biomaterials must meet the following conditions to meet the requirements of use: ①Good biocompatibility; ②High corrosion resistance; ③The modulus of elasticity is close to that of human bones; ④Non-carcinogenic. For Ti alloy materials, due to their good corrosion resistance and biocompatibility, they have gained wide attention and applications in the field of biomedicine. [0003] Binary Ni-Ti alloy has good biocompatibility and corrosion resistance, making it a good biomedical material. The formation of an oxide layer on the surface of the alloy improves the corrosion resistance of the alloy, and at the same time prevents the diffusion of Ni ions to reduce biological toxicity. However, even though NiTi alloy exhibits corrosion resistance comparabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C30/02
Inventor 潘冠军孟祥康任华陆洪彬
Owner HAIAN INST OF HIGH TECH RES NANJING UNIV
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