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Method for preparing titanium aluminum intermetallic compound from hydrogenated titanium-aluminum alloy through short process

An intermetallic compound, titanium-aluminum alloy technology, applied in the field of powder metallurgy, can solve problems such as no titanium-aluminum intermetallic compound, and achieve the effect of realizing large-scale continuous production, fine particle size, and preventing oxidation and pollution

Inactive Publication Date: 2014-03-19
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are no related reports on the method of preparing titanium-aluminum intermetallic compounds using hydrogenated titanium-aluminum alloy powder in a short process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Using high-purity aluminum with a purity of 99.9% and titanium sponge with a purity of 99% as raw materials, melt it into an alloy ingot in a vacuum induction furnace to obtain a large-sized ingot with a nominal composition of Ti-46Al;

[0027] (2) The alloy ingot is coarsely crushed by low-temperature cold air chips, the temperature of the compressed nitrogen cold air is -30°C, and the particle size of the chips is 2mm;

[0028] (3) Put the alloy powder into the vacuum atmosphere furnace, turn on the vacuum system, and the vacuum degree reaches 10 -2 Afterwards, start heating, and when the temperature rises to 260°C, hydrogen gas is introduced into the furnace, slowly heated to 450°C and kept for 3 hours, and the hydrogen pressure is kept at 0.15MPa during this process. Stop the hydrogen flow when the temperature in the furnace drops to 250°C, and take out the hydrogenated titanium-aluminum alloy powder when it is lower than 100°C;

[0029] (4) Grind the hydrogena...

Embodiment 2

[0032] (1) Using high-purity aluminum with a purity of 99.9% and titanium sponge with a purity of 99% as raw materials, it is melted into an alloy ingot in a vacuum consumable electrode arc shell solidification furnace, and a large-sized ingot with a nominal composition of Ti-50Al is produced. ingot;

[0033] (2) The alloy ingot is crushed into 4mm powder particles by repeated pressurization of the press;

[0034] (3) Put the alloy powder into the furnace tube of the vacuum atmosphere furnace, turn on the vacuum system, and the vacuum degree reaches 8×10 -3 Afterwards, start heating, and when the temperature rises to 250°C, hydrogen gas is introduced into the furnace, slowly heated to 580°C and kept for 2 hours, and the hydrogen pressure is kept at 0.20MPa during this process. Stop the hydrogen flow when the temperature in the furnace drops to 280°C, and take out the hydrogenated titanium-aluminum alloy powder when it is lower than 90°C;

[0035] (4) Grind the hydrogenated p...

Embodiment 3

[0038] (1) Using high-purity aluminum with a purity of 99.9% and titanium sponge with a purity of 99% as raw materials, melt it into an alloy ingot in a vacuum induction furnace to obtain a large-sized ingot with a nominal composition of Ti-48Al;

[0039](2) The alloy ingot is coarsely crushed by low-temperature cold air chips, the temperature of the compressed nitrogen cold air is -45°C, and the particle size of the chips is 1mm;

[0040] (3) Put the alloy powder into the vacuum atmosphere furnace, turn on the vacuum system, and the vacuum degree reaches 10 -3 Afterwards, start heating, and when the temperature rises to 280°C, hydrogen gas is introduced into the furnace, slowly heated to 550°C and kept for 2 hours, and the hydrogen pressure is kept at 0.18MPa during this process. Stop the hydrogen flow when the temperature in the furnace drops to 270°C, and take out the hydrogenated titanium-aluminum alloy powder when it is lower than 80°C;

[0041] (4) Grind the hydrogenate...

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Abstract

The invention relates to a method for preparing a titanium aluminum intermetallic compound from a hydrogenated titanium-aluminum alloy through a short process. High-purity aluminum and titanium sponge serve as raw materials and are smelted into titanium-aluminum alloy cast ingots in a vacuum consumable electrode electric arc kish furnace or a vacuum induction furnace, the cast ingots are then crushed to be powder in a coarse mode, the powder is subjected to hydrogen treatment to obtain brittle hydrogenated alloy powder, and then the alloy powder is grinded to be microfine titanium-aluminum alloy powder by using vortex air flows; rough bodies are formed by manufacturing the hydrogenated alloy powder and subjected to a dehydrogenation reaction in the sintering and heating process, the alloy powder after the dehydrogenation reaction is high in surface activity and easy to densify through sintering, and the titanium aluminum intermetallic compound product is finally obtained and is high in purity, low in oxygen content and high in relative density. The method is short in technological process, high in operation stability, high in repeatability and capable of achieving mass continuous production; the prepared titanium-aluminum alloy powder has the advantages of being high in purity, low in oxygen content, small in particle size, narrow in size distribution, good in evenness and the like and is suitable for compression molding, injection molding and gelcasting molding.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and in particular relates to a method for preparing titanium-aluminum intermetallic compounds through a short flow process of hydrogenated titanium-aluminum alloy powder. Background technique [0002] Titanium-aluminum intermetallic compounds have the advantages of high temperature resistance, oxidation resistance, corrosion resistance, wear resistance, high specific rigidity and high specific strength. The development potential of a new generation of lightweight high-temperature structural materials for aerospace engines. The alloy exhibits good high-temperature performance in a high-temperature environment of 700 ° C to 1000 ° C; but in the temperature range below 700 ° C, its elongation is only 1% to 3%, showing serious room temperature brittleness, and plastic processing is difficult. , The high cost of preparation hinders the development and application of titanium-aluminum alloys. [0003...

Claims

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Application Information

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IPC IPC(8): B22F3/00C22C14/00C22C21/00C22C1/04
Inventor 郭志猛叶青张欣悦林均品柏鉴玲赵子粉吴胜江
Owner UNIV OF SCI & TECH BEIJING
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