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A preparation method of titanium-niobium alloy with adjustable negative thermal expansion coefficient

A technology of negative thermal expansion coefficient and titanium-niobium alloy, applied in metal rolling, heat treatment equipment, manufacturing tools, etc., can solve the problems of not wide applicable temperature range and narrow adjustable range, and achieve wide applicable temperature range and adjustable range Large, stable shape memory effect

Active Publication Date: 2022-04-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The present invention provides a method for preparing a titanium-niobium alloy with an adjustable negative thermal expansion coefficient, aiming at the problem that the negative thermal expansion coefficient can be adjusted in a narrow range and the applicable temperature range is not wide in the titanium alloy with negative thermal expansion characteristics in the prior art , the titanium-niobium alloy prepared by the method of the present invention can achieve a negative coefficient of thermal expansion close to zero along the rolling direction, so that a product with high dimensional stability under a certain range of temperature changes can be obtained, and by adjusting specific parameters in the preparation process , which can realize a wide range of adjustment of the negative thermal expansion coefficient of titanium-niobium alloy

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  • A preparation method of titanium-niobium alloy with adjustable negative thermal expansion coefficient
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  • A preparation method of titanium-niobium alloy with adjustable negative thermal expansion coefficient

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Embodiment 1

[0029] The preparation method of titanium niobium alloy of the present invention is: (1) with Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each substance is weighed: Ti: 65.725g; Nb: 34.000g; TiO 2: 0.275g; the weight percent of each element of the prepared alloy is: Nb: 34.0%; O: 0.11%, the balance is Ti; the prepared raw materials are placed in a vacuum non-consumable electric arc furnace with magnetic stirring for repeated melting Five times to obtain an ingot with uniform composition; (2) hot forging the ingot into a bar at 900°C, with a deformation of 80%; (3) solid solution treating the bar in step (2) at 800°C After 60 minutes, put it into water for quenching and cooling; (4) turning to remove the scale on the surface of the bar, and then carry out cold rolling deformation with a deformation amount of 92% at room temperature. After the above treatment, an alloy whose phase composition is β matrix + a small amount of α" phase is ob...

Embodiment 2

[0031] The preparation method of titanium niobium alloy of the present invention is: (1) with Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each substance is weighed: Ti: 65.600g; Nb: 34.100g; TiO 2 : 0.300g; the weight percent of each element of the prepared alloy is: Nb: 34.1%; O: 0.12%, the balance is Ti; the prepared raw materials are placed in a vacuum non-consumable electric arc furnace with magnetic stirring for repeated melting Five times to obtain an ingot with uniform composition; (2) hot forging the ingot into a bar at 950°C, with a deformation of 70%; (3) solid solution treating the bar in step (2) at 850°C After 30min, drop into water for quenching and cooling; (4) turning to remove the scale on the surface of the bar, and then carry out the cold rolling deformation at room temperature with a deformation amount of 95%; (5) place the cold-rolled bar of step (4) at 302° C. Under 3min pre-aging treatment. After the above treatm...

Embodiment 3

[0033] The preparation method of titanium niobium alloy of the present invention is: (1) with Ti, Nb and TiO 2 Powder is used as raw material to prepare alloy, and the weight of each substance is weighed: Ti: 65.650g; Nb: 34.100g; TiO 2 : 0.250g; the weight percent of each element of the prepared alloy is: Nb: 34.1%; O: 0.10%, the balance is Ti; the prepared raw materials are placed in a magnetically stirred vacuum non-consumable electric arc furnace for repeated melting Five times to obtain an ingot with uniform composition; (2) hot forging the ingot into a bar at 1000°C, with a deformation of 75%; (3) solid solution treating the bar in step (2) at 950°C After 45min, drop into water for quenching and cooling; (4) turning to remove the oxide skin on the surface of the bar, and then carry out the cold-rolling deformation with a deformation amount of 93% at room temperature; (5) place the cold-rolled bar of step (4) at 304° C. Under 10min pre-aging treatment. After the above t...

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Abstract

The invention discloses a preparation method of a titanium-niobium alloy with an adjustable negative thermal expansion coefficient. The preparation method is: quenching and cooling the titanium alloy doped with Nb element after solid solution treatment to obtain a β+α" phase The titanium-niobium alloy of composition is carried out cold deformation processing again, carries out pre-aging treatment after cold deformation processing, obtains the titanium-niobium alloy stretching along rolling direction when changing with temperature.Preparation method of the present invention is by changing the pre-aging treatment time, makes The alloy has -33.0×10 ‑6 / K~-0.9×10 ‑6 / K adjustable negative thermal expansion coefficient; the titanium-niobium alloy prepared in the present invention can be suitable for preparing high-performance temperature-sensitive components such as thermal switches and intelligent valves, and high-precision instrument components requiring high dimensional stability.

Description

technical field [0001] The invention relates to a preparation method of titanium-niobium alloy with adjustable negative thermal expansion coefficient. Background technique [0002] The phenomenon that the volume or length of an object changes relative to the change of temperature is called thermal expansion. Ordinary materials generally have a positive coefficient of thermal 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 such as bridges and railway ...

Claims

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Application Information

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IPC IPC(8): C22F1/18C22C14/00C22C1/02C21D9/00B21B3/00
Inventor 陈锋武祥为邹雯倩
Owner SOUTHEAST UNIV