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Gel mould-injecting formation of nickel-titanium-based shape memory alloy with high porosity

A gel injection molding and memory alloy technology, applied in the field of powder metallurgy molding, can solve the problems of poor macroscopic distribution of pores, difficulty in obtaining complex-shaped parts, and difficulty in preparing nickel-titanium alloys. The effect of porosity, high open porosity

Inactive Publication Date: 2008-05-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, it is difficult to realize the preparation of high-porosity nickel-titanium alloys
Traditional powder metallurgy molding technology is difficult to obtain complex shape parts, and the porosity is low; the porosity of nickel-titanium alloy prepared by self-propagating high-temperature synthesis technology can reach 60%, but the uniformity of the macroscopic distribution of pores is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Use 10-100 μm nickel powder and 10-100 μm titanium powder as raw materials, and mix them uniformly by ball milling for 10 hours according to the atomic ratio of nickel and titanium (mass ratio 55.07:44.93); mix 15 grams of acrylamide, 1 gram of N, N-substance Methylbisacrylamide was dissolved in 100 ml of water, 670 g of nickel-titanium mixed powder and 5 g of polyacrylic acid dispersant were added, after 48 hours of ball milling, vacuum defoaming was carried out for 30 minutes to obtain a slurry with a solid phase volume fraction of 50%, and injected into the metal After the mold is molded, move the mold into an 80°C thermostat for 120 minutes, and vacuum dry it for 72 hours after demolding to obtain a gel injection molded nickel-titanium shape memory alloy part blank; the blank is sintered to obtain a nickel-titanium shape memory alloy part .

[0020] The porosity of the gel injection molded nickel-titanium shape memory alloy parts prepared by this process is 40.7%, a...

Embodiment 2

[0022] Use 10-100 μm nickel powder and 10-100 μm titanium powder as raw materials, and mix them uniformly by ball milling for 18 hours according to the nickel-titanium atomic ratio 1:1 (mass ratio 55.07:44.93); mix 20 grams of acrylamide, 6 grams of N, N-substance Dissolve methylbisacrylamide in 100 ml of water to make a solution, add 450 grams of nickel-titanium mixed powder and 10 grams of polyacrylamide dispersant, and vacuum defoam for 20 minutes after ball milling for 24 hours to obtain a solid phase volume fraction of 40%. of slurry. Inject the obtained slurry into a glass mold and keep it warm at 60°C for 120 minutes. The slurry in the mold is solidified into a green body. After demoulding, it is vacuum-dried for 48 hours to obtain a gel injection molded nickel-titanium shape memory alloy part blank; The nickel-titanium shape memory alloy parts are obtained after sintering.

[0023] The porosity of the gel injection molded nickel-titanium shape memory alloy parts prepa...

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Abstract

An injection moulding method for preparing high-porosity NiTi-based marmem includes such steps as dissolving acrylamide and N,N-methyleno biacrylamide as cross-linking agent in solvent, adding Ni powder and Ti powder to make them be suspended in the solution, adding trigger and catalyst, injecting the slurry into non-porous mould, cross-linking and polymerizing to become 3D recticular polymer gel while in-situ adhering the particles, and solidifying. Its advantages are high porosity, high rate of open pores and uniform distribution of pores.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy molding, and in particular provides a gel injection molding method for a high-porosity nickel-titanium-based shape memory alloy. Background technique [0002] Nickel-titanium shape memory alloy has the advantages of high strength, low specific gravity, fatigue resistance, corrosion resistance, wear resistance, low magnetism, non-toxicity, and elastic modulus similar to human bone; at the same time, nickel-titanium alloy also has excellent biocompatibility , especially the porous nickel-titanium alloy is easy to be fixed by human tissue, it is an ideal biomedical implant material, and has broad application prospects in the medical field. [0003] However, it is difficult to realize the preparation of high-porosity nickel-titanium alloys. Traditional powder metallurgy molding technology is difficult to obtain complex shape parts, and the porosity is low; the porosity of nickel-titanium al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 郭志猛李艳郝俊杰
Owner UNIV OF SCI & TECH BEIJING
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