A method for preparing titanium-aluminum intermetallic compound with hydrogenated titanium-aluminum alloy powder in a short process

A technology of intermetallic compounds and titanium-aluminum alloys, which is applied in the field of powder metallurgy, can solve the problems of no titanium-aluminum intermetallic compounds, and achieve the effects of large-scale continuous production, short time consumption, and prevention of oxidation and pollution

Inactive Publication Date: 2017-01-04
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) Alloy ingots are 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 2 mm.

[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. When the temperature in the furnace drops to 250°C, the hydrogen flow is stopped, and the hydrogenated titanium-aluminum alloy powder is taken out when the temperature is lower than 100°C.

[0029] ...

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 obtained. ingot.

[0033] (2) Alloy ingots The ingots were roughly crushed into powder particles of 4 mm by repeated pressurization with a 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. When the temperature in the furnace drops to 280°C, the hydrogen flow is stopped, and the hydrogenated titanium-aluminum alloy powder is taken out when the temperature is lower tha...

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) Alloy ingots are 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. When the temperature in the furnace drops to 270°C, the hydrogen flow is stopped, and the hydrogenated titanium-aluminum alloy powder is taken out when the temperature is lower than 80°C.

[0041] (4)...

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Abstract

The present invention is a method for preparing titanium-aluminum intermetallic compounds through a short flow process of hydrogenated titanium-aluminum alloy powder, using high-purity aluminum and sponge titanium as raw materials, and melting them into titanium-aluminum alloy castings in a vacuum auto-electrode arc solidification furnace or a vacuum induction furnace. Ingot, then coarsely crushed into powder, after hydrogenation treatment to obtain brittle hydrogenated alloy powder, and then use vortex jet mill to grind into fine titanium aluminum alloy powder; the hydrogenated alloy powder is made into a green body, and the green body is sintered during the heating process The dehydrogenation reaction occurs in the process, and the alloy powder after the dehydrogenation reaction has high surface activity, and is easy to sinter and compact. After sintering, a titanium-aluminum intermetallic compound product with high purity, low oxygen content, and high relative density is finally obtained. The method has short process flow, high operational stability and strong repeatability, and can realize large-scale continuous production; the prepared titanium-aluminum alloy powder has high purity, low oxygen content, fine particle size, narrow particle size distribution, and good uniformity And other advantages, suitable for compression molding, injection molding, gel injection 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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Patent Type & Authority Patents(China)
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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