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Titanium-niobium-oxygen alloy with negative thermal expansion and preparation method thereof

A negative thermal expansion and alloy technology, which is applied in the field of negative thermal expansion titanium niobium oxygen alloy and its preparation, can solve the problems of low negative thermal expansion coefficient of titanium alloy, insufficient temperature range, narrow adjustable range, etc., and achieve stable shape memory effect Effect

Active Publication Date: 2021-03-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in general, the negative thermal expansion coefficient of the above-mentioned titanium alloy is small, the adjustable range is narrow, and the applicable temperature range is not wide enough

Method used

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  • Titanium-niobium-oxygen alloy with negative thermal expansion and preparation method thereof
  • Titanium-niobium-oxygen alloy with negative thermal expansion and preparation method thereof
  • Titanium-niobium-oxygen alloy with negative thermal expansion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] With high purity Ti, Nb and TiO 2 The powder is used as a raw material to prepare an alloy, and the weight of each component is: Ti: 65.900g; Nb: 34.100g; the weight percentage of each alloy element is: Nb: 34.1wt%; O: 0wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot-forged into a bar at 1000°C with a deformation of 75%. After solution treatment at 900°C for 40 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 93% at room temperature.

[0028] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as follows figure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix + a small a...

Embodiment 2

[0031] With high purity Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each component is: Ti: 65.150g; Nb: 34.100g; TiO 2 : 0.750g; the weight percent of each alloy element is: Nb: 34.1wt%; O: 0.3wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot forged into a bar at 900°C with a deformation of 80%. After solid solution treatment at 850°C for 60 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 95% at room temperature.

[0032] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as followsfigure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix +...

Embodiment 3

[0034] With high purity Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each component is: Ti: 64.500g; Nb: 34.000g; TiO 2 : 1.500g; the weight percent of each alloy element is: Nb: 34.0wt%; O: 0.6wt%, and the balance is Ti. The prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for five times of repeated melting to obtain an ingot with uniform composition. The ingot was hot forged into a bar at 950°C with a deformation of 70%. After solution treatment at 950°C for 30 minutes, put it into water for quenching and cooling. Turning removes the scale on the surface of the bar, and then carries out cold rolling deformation with a deformation amount of 92% at room temperature.

[0035] After the above treatment, the obtained alloy is subjected to XRD analysis, and the spectrum is as follows figure 1 As shown, according to the figure, it can be seen that the phase composition is β matrix + a s...

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Abstract

The invention discloses a titanium-niobium-oxygen alloy with negative thermal expansion. The alloy comprises the following components including, by weight, 34.0%-34.1% of Nb, 0% to 0.6% of O, and thebalance Ti. The preparation method of the titanium-niobium-oxygen alloy is further included and comprises the following specific steps of smelting by adopting a vacuum non-consumable electric arc furnace to obtain an alloy cast ingot with uniform components, carrying out hot forging to form a bar, carrying out solution treatment at 850 DEG C-950 DEG C, and carrying out water cooling to room temperature; and then conducting cold rolling deformation processing, wherein the deformation amount is 92%-95%. According to the titanium-niobium-oxygen alloy, by changing the O content within the range of0%-0.6% by weight, the alloy has an adjustable negative thermal expansion coefficient of -28.8*10<-6> / K--8.3*10<-6> within the temperature range of 25 DEG C-380 DEG C, has a stable shape memory effect during temperature circulation, and is suitable for preparing low-expansion-coefficient components and temperature sensitive elements such as thermal switches and intelligent valves.

Description

technical field [0001] The invention belongs to titanium alloy preparation technology, in particular to a titanium-niobium-oxygen alloy with negative thermal expansion and a preparation method thereof. Background technique [0002] The phenomenon that the volume or length of an object changes relative to temperature is called thermal expansion. Ordinary materials generally have a positive coefficient of expansion, which is their inherent nature. When there is a large temperature change in the object, on the one hand, it is easy to generate thermal stress, for example, the difference in thermal expansion coefficient between the substrate and the film will generate internal stress, which will affect the physical, electrical and thermal properties of the film; on the other hand, it will cause Components produce obvious dimensional changes, which affects the accuracy of precision instruments, and also leads to the need to leave expansion joints at the joints of large structures...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22F1/006C22F1/18
Inventor 陈锋武祥为邹雯倩
Owner SOUTHEAST UNIV
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