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Low-modulus high-corrosion-resistance 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 of size limitation, high equipment cost, and difficulty in meeting the requirements of material fracture toughness, so as to reduce material waste and improve mechanical properties, size and size. The effect of reducing the number of

Active Publication Date: 2014-11-26
HAIAN INST OF HIGH TECH RES NANJING UNIV
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  • Abstract
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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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  • Low-modulus high-corrosion-resistance ternary Ni-Ti-Cu alloy and preparation method thereof
  • Low-modulus high-corrosion-resistance ternary Ni-Ti-Cu alloy and preparation method thereof
  • Low-modulus high-corrosion-resistance ternary Ni-Ti-Cu alloy and preparation method thereof

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Experimental program
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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-resistance ternary Ni-Ti-Cu alloy and a preparation method thereof. According to the main technical scheme, the elasticity modulus of the Ni26Ti49Cu25 alloy prepared through adding a Cu element and under the condition of rapid solidification is about 60GPa. The alloy disclosed by the invention has the following beneficial effects that the alloy is easier to realize in actual industrial production by utilizing the situation that the cooling rate of a water-cooling copper crucible method is far lower than that of other rapid cooling conditions (such as melt-spinning technique); Cu can play a role of passivation on the surface of the alloy so as to increase the corrosion resistance of the alloy; in addition, the Cu of the ternary Ni-Ti-Cu alloy can be slowly released from an intravascular stent, so that a very good relieving effect can be provided for the restenosis symptom after a heart valve operation.

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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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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