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Method for preparing porous foam nickel-titanium shape memory alloy

A memory alloy and porous foam technology, which is applied in the field of foam metal materials, can solve the problems of difficult pore structure control of products, difficult pore structure control, process stability control, etc., and achieves recyclable materials, uniform and controllable structure, and porous structure. controllable effect

Inactive Publication Date: 2008-07-09
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, the powder metallurgy method has the disadvantages of difficulty in controlling the pore structure and low porosity of the product; although the self-propagating high-temperature synthesis method has a simple process, it has the disadvantages of difficult process stability control and product pore structure control

Method used

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  • Method for preparing porous foam nickel-titanium shape memory alloy

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Embodiment 1

[0012] Copper balls (big ball diameter 0.5mm, small ball diameter 0.1mm, volume ratio of big and small balls 5:1) were mixed evenly in the mixer (speed: 120rpm, mixing time: 30min.), put into H 2 Sintering is carried out in a silicon carbon rod sintering furnace in a reducing atmosphere (sintering temperature: 960°C, sintering time 25min.) to obtain a copper infiltration precursor, and the sintered copper infiltration precursor is preheated (preheating temperature: 880°C, preheating time 10min.) Standby. At the same time, the nickel-titanium shape memory alloy is heated to 1400°C in a graphite crucible with an induction furnace to melt and hold for 30 minutes. It penetrates into the precursor through pressure seepage (seepage pressure: 26MPa, seepage temperature: 1390°C, seepage velocity: 3mm / s) In the process, the composite body after infiltration was cooled with water to obtain a composite body of nickel-titanium shape memory alloy and copper precursor, and the composite bod...

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Abstract

A method for preparing porous foam nickel-titanium shaped memory alloy belongs to the field of porous foam metal. The invention uses copper metal balls with different diameters to sinter into a precursor, the melting point of the copper metal ball is lower than that of the nickel-titanium shaped memory alloy, the nickel-titanium shaped memory alloy is used as a seepage flow body and is permeated into the precursor through the method of pressure seepage flow, a complex is made after cooling, the metal copper of the precursor is melted and removed from the complex through heating the complex, and the porous foam nickel-titanium shaped memory alloy is made. The invention has the characteristics that the process is simple, the problems existing in prior art that the porosity is low, the porosity structure control and the process control are difficult are solved, the manufacturing cost is low, the materials are capable of being circularly used, the environmental is not polluted, and the industrialized production is capable of being achieved.

Description

technical field [0001] The invention belongs to the field of foam metal materials, in particular to a process for preparing porous foam nickel-titanium shape memory alloys. Background technique [0002] Porous nickel-titanium shape memory alloy has good shape memory effect, pseudoelasticity, biocompatibility and good mechanical properties, and has a broad application market in the fields of biomedicine and biomaterials. [0003] At present, the known preparation methods of porous nickel-titanium shape memory alloys mainly include element powder mixing sintering method, pre-alloyed powder sintering method and self-propagating high-temperature synthesis method. However, the powder metallurgy method has the disadvantages of difficulty in controlling the pore structure and low porosity of the product; although the self-propagating high-temperature synthesis method has a simple process, it has the disadvantages of difficult process stability control and product pore structure con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C14/00C22C19/03
Inventor 左孝青陆建生周芸孙加林
Owner KUNMING UNIV OF SCI & TECH
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