A titanium-nickel alloy with rich titanium content and a preparation method thereof with negative thermal expansion properties

A technology of titanium-nickel alloy and negative thermal expansion, which is applied in the field of titanium-nickel alloy materials, can solve the problems of unstable negative thermal expansion of NiTi alloy and low strength of porous Ti-Ni alloy, and achieve stable compressive strength, excellent linear superelasticity, good Effect of Thermal Expansion Matching Properties

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a titanium-rich alloy with high strength, good superelasticity and stable negative thermal expansion for the problems of low strength of porous Ti-Ni alloys in the prior art and unstable negative thermal expansion properties of nearly equiatomic ratio NiTi alloys. Titanium-nickel alloy with high content and preparation method thereof

Method used

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  • A titanium-nickel alloy with rich titanium content and a preparation method thereof with negative thermal expansion properties
  • A titanium-nickel alloy with rich titanium content and a preparation method thereof with negative thermal expansion properties
  • A titanium-nickel alloy with rich titanium content and a preparation method thereof with negative thermal expansion properties

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] According to the atomic ratio of titanium to nickel is 58:42, respectively weigh 58.0% of sponge titanium with a purity of 99.7% and 42.0% of electrolytic nickel with a purity of 99.8%, and put the weighed raw materials into a non-consumable vacuum arc melting furnace In a copper crucible; use a mechanical pump and a molecular pump to evacuate to 6.0×10 -3 Pa, filled with 0.01MPa high-purity argon as shielding gas and arc ignition gas.

[0041] Before smelting the alloy, first smelt the pure sponge titanium for 60s to remove the impurity gas in the furnace cavity, then move the electrode to the top of the crucible containing the alloy raw material for smelting, the smelting current is 100A, and keep it for 70s; after the button ingot alloy is cooled, use The mechanical arm turns the alloy over, restarts the arc to start melting, and repeats the melting 3 times to make the alloy composition uniform. Turn the button ingot alloy into the suction casting copper crucible, f...

Embodiment 2

[0046] According to the atomic ratio of titanium to nickel is 56:44, respectively weigh 56.0% of sponge titanium with a purity of 99.7% and 44.0% of electrolytic nickel with a purity of 99.8%, and put the weighed raw materials into a non-consumable vacuum arc melting furnace In a copper crucible; use a mechanical pump and a molecular pump to evacuate to 5.0×10 -3 Pa, filled with 0.01MPa high-purity argon gas as shielding gas and arc ignition gas.

[0047] Before smelting the alloy, first smelt the pure sponge titanium for 30s to remove the impurity gas in the furnace cavity, then move the electrode to the top of the crucible containing the alloy raw material for smelting, the smelting current is 70A, and keep it for 60s; after the button ingot alloy is cooled, use The mechanical arm turns the alloy over, restarts the arc to start melting, and repeats the melting 5 times to make the alloy composition uniform. Turn the button ingot alloy into the suction casting copper crucible...

Embodiment 3

[0052] According to the atomic ratio of titanium to nickel is 54:46, respectively weigh 54.0% of sponge titanium with a purity of 99.7% and 46.0% of electrolytic nickel with a purity of 99.8%, and put the weighed raw materials into a non-consumable vacuum arc melting furnace In a copper crucible; use a mechanical pump and a molecular pump to evacuate to 4.0×10 -3 Pa, filled with 0.02MPa high-purity argon as shielding gas and arc ignition gas.

[0053] Before smelting the alloy, first smelt the pure sponge titanium for 50s to remove the impurity gas in the furnace cavity, then move the electrode to the top of the crucible containing the alloy raw material for smelting, the smelting current is 120A, and keep it for 90s; after the button ingot alloy is cooled, use The mechanical arm turns the alloy over, restarts the arc to start melting, and repeats the melting 6 times to make the alloy composition uniform. Turn the button ingot alloy into the suction casting copper crucible, f...

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Abstract

The invention discloses a titanium-rich titanium nickel alloy with negative heat expansion performance and a preparation method thereof. The general formula of the titanium-rich titanium nickel alloy is Ti(100-x)Nix, wherein x is the atomic percentage and meets the relation of x=42.0-46.0. In preparation, electrolytic nickel and sponge titanium serve as raw materials and are placed into a copper crucible, with circulating water led in for cooling, of a vacuum electric-arc smelting furnace after dosing is conducted in proportion, and repeated smelting is conducted under protection of inert gas; a smelted button-shaped mother alloy is placed into a suction-casting copper crucible and heated for remelting, an alloy melt is suctioned into a suction-casting copper mould with circulating water led in for cooling under the vacuum negative-pressure effect, and an alloy with a needed shape is obtained through quick solidification; and after annealing treatment is conducted at the temperature of 800-900 DEG C, a titanium nickel alloy material with a stable negative heat expansion response temperature interval is prepared, and high strength and excellent linear superelasticity are simultaneously achieved. The titanium nickel alloy material is suitable for being compounded with a positive heat expansion material.

Description

technical field [0001] The invention relates to a titanium-nickel alloy material with negative thermal expansion performance, in particular to a method for rapidly solidifying and preparing a metal material with a stable negative thermal expansion response temperature range, high strength and excellent linear superelasticity. Background technique [0002] Negative thermal expansion refers to the special thermal expansion behavior in which the volume of a material increases as the temperature decreases within a certain temperature range. The materials with negative thermal expansion behavior found so far are very limited, and most of them are inorganic non-metallic materials, such as ZrW 2 o 8 The representative negative thermal expansion materials of tungstate and molybdate series and manganese-based nitride Mn 3 AN (A represents Zn, Ga, Cu) and so on. Invar alloy is one of the few metal materials with macroscopically low expansion behavior reported so far. The low expans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C19/05C22C1/02
CPCC22C1/02C22C1/023C22C14/00C22C19/058
Inventor 马骁祝星张新平赵仲勋曹姗姗
Owner SOUTH CHINA UNIV OF TECH
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