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Preparation method for porous NiTi alloy based on selective dissolution and product

A selective and alloying technology, applied in the field of preparation of porous NiTi alloys, which can solve the problems of limited pore size uniformity, inability to prepare porous NiTi alloys, and large pore size.

Active Publication Date: 2020-10-30
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing porous NiTi alloy preparation methods still have the following deficiencies: the pore size of the prepared porous NiTi alloy is relatively large, ranging from tens of microns to hundreds of microns, and the uniformity of the pore size is limited. Porous NiTi alloy

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  • Preparation method for porous NiTi alloy based on selective dissolution and product
  • Preparation method for porous NiTi alloy based on selective dissolution and product
  • Preparation method for porous NiTi alloy based on selective dissolution and product

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preparation example Construction

[0037] Specifically, as figure 1 As shown, the method for preparing a porous NiTi alloy based on selective dissolution provided by the embodiment of the present invention, that is, a method for preparing and regulating the pore structure of a porous NiTi alloy by a selective dissolution process, includes the following steps:

[0038] S1 ingredients:

[0039] According to a certain proportion, the raw material nickel block, titanium block and gadolinium block are batched, and the target alloy composition is calculated as Ni by atomic fraction 48-2x Ti 44-6x Gd 8(1+x) , where, x=0~2, under this ratio, pre-alloying can form a structure containing only NiTi and NiGd, and the atomic ratio of Ni and Ti is appropriate, which is conducive to its shape memory effect, where the larger X is, the pre-alloying The smaller the proportion of NiTi in the medium, the higher the porosity of porous NiTi; the purity of nickel blocks, titanium blocks, and gadolinium blocks are all above 99.9%; ...

Embodiment 1

[0056] 1) Polish the nickel block, titanium block, and gadolinium block with a purity of 99.9%, remove the surface oxide skin, and then perform ultrasonic cleaning treatment in absolute ethanol. After drying, follow the Ni 48 Ti 44 Gd 8 Atomic formulation of nickel block, titanium block and gadolinium block;

[0057] 2) Put the prepared raw materials into the vacuum arc melting furnace and vacuumize to 3×10 -3 After Pa, argon gas is introduced into the vacuum chamber until the chamber pressure is -0.05MPa; the raw material is arc-melted at a melting temperature of 1800°C, and the alloy ingot at each station is kept for 3 minutes after it is completely melted, and then the sample is turned over with a turning rod Turn the alloy ingot over and remelt it. Each alloy ingot is smelted 4 times. After the smelting is completed, it is cooled with the water-cooled copper mold, and the pre-alloyed Ni is taken out. 48 Ti 44 Gd 8 ;

[0058] 3) Cut the pre-alloy into suitable small p...

Embodiment 2

[0064] 1) Polish the nickel block, titanium block, and gadolinium block with a purity of 99.9%, remove the surface oxide skin, and then perform ultrasonic cleaning treatment in absolute ethanol. After drying, follow the Ni 48 Ti 44 Gd 8 Atomic formulation of nickel blocks, titanium blocks and gadolinium blocks.

[0065] 2) Put the prepared raw materials into the vacuum arc melting furnace and vacuumize to 3×10 -3 After Pa, argon gas is passed into the vacuum chamber until the chamber pressure is -0.05MPa; the raw material is arc-melted at a melting temperature of 1650°C, and the raw material is kept for 3 minutes after it is completely melted to cool it completely, and then it is cooled with a turning rod. Re-melt after turning over, smelting 4 times in total, after the smelting is completed, the bottom mold in the arc melting furnace, that is, the water-cooled copper mold, is cooled, and the pre-alloyed Ni is taken out. 48 Ti 44 Gd 8 ;

[0066] 3) Cut the pre-alloy into...

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Abstract

The invention belongs to the field of porous alloy preparation, and particularly discloses a preparation method for a porous NiTi alloy based on selective dissolution and a product. The preparation method comprises the following steps: adding a Gd element into a Ni-Ti binary alloy, based on the characteristic that the Gd element can react with the Ni element but not react with the Ti element, onlyNi-Ti and Ni-Gd phases are generated in the alloy, and then removing the Ni-Gd phases based on selective corrosion by using an acid solution to obtain the porous NiTi alloy with uniform and controllable pores. The method can be used for preparing the porous NiTi alloy with small pore size and uniform distribution, and has the advantages of simple and convenient operation process and lower cost.

Description

technical field [0001] The invention belongs to the field of porous alloy preparation, and more specifically relates to a preparation method and product of a porous NiTi alloy based on selective dissolution. Background technique [0002] NiTi alloys with near-equal atomic ratios have unique shape memory effects, superelasticity, excellent fracture toughness, corrosion resistance, biocompatibility and damping properties, so they have great potential in biomedicine, construction, bridges, high-speed trains, etc. Wide application prospects. However, the density of NiTi alloy is high, which is difficult to meet the needs of lightweight structural parts in aerospace, automobile manufacturing and other fields. Due to the introduction of pore structure, the porous NiTi alloy reduces the alloy density, which is beneficial to the lightweight of the alloy. And the high damping performance of porous NiTi alloy makes it expected to be used as a damping device and effectively convert e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/08C22C19/03C23F1/30C23F1/44
CPCC22C1/023C22C1/08C22C19/03C23F1/30C23F1/44
Inventor 郭威邵雨曼郑伟杰赵觅吴树森吕书林
Owner HUAZHONG UNIV OF SCI & TECH
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