A method of hydrothermal treatment to improve the high temperature oxidation resistance of titanium-based alloys

A high-temperature oxidation-resistant, titanium-based alloy technology, which is applied in the coating process of metal materials, can solve the problems of insufficient high-temperature oxidation resistance of titanium-based alloys, reduce the mechanical properties and pollution of titanium-based alloys, and avoid the decline of mechanical properties , Improve high temperature oxidation resistance, low cost effect

Active Publication Date: 2021-11-23
SUN YAT SEN UNIV
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Problems solved by technology

[0005] In order to solve the insufficient high-temperature oxidation resistance of existing titanium-based alloys, the existing optimization methods either reduce the mechanical properties of titanium-based alloys, or have high costs and certain pollution, or the existing treatment methods are relatively Large limitations, most of which are only applicable to problems such as flat alloy treatment, the present invention provides a method for improving the high temperature oxidation resistance of titanium-based alloys by hydrothermal treatment

Method used

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  • A method of hydrothermal treatment to improve the high temperature oxidation resistance of titanium-based alloys
  • A method of hydrothermal treatment to improve the high temperature oxidation resistance of titanium-based alloys
  • A method of hydrothermal treatment to improve the high temperature oxidation resistance of titanium-based alloys

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Embodiment 1

[0048] First, carry out conventional pretreatment on titanium-based alloys: grind the Ti-Al alloy sample (titanium-aluminum atomic ratio is 1:1) with sandpaper to remove surface oxides, then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally use hot air Drying can obtain the pretreated titanium-based alloy. Dissolve ammonium fluoride, potassium fluoride and sodium fluoride in deionized water at a molar ratio of 10:1:2 and stir at room temperature for 2 hours to prepare a salt solution with a total concentration of halogen salt of 2 wt%. Immerse the titanium-based alloy in a salt solution, place it in a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, put it in an oven, and conduct a hydrothermal treatment at a temperature of 140°C for 6 hours. After completion, it is cooled naturally, rinsed with deionized water, and dried in the air. Finally, a titanium-aluminum alloy sample containing F on the surface was obtained. Subsequently, the...

Embodiment 2

[0053] First, carry out conventional pretreatment on titanium-based alloys: use sandpaper to polish the 3Ti-Al alloy sample (titanium-aluminum atomic ratio is 3:1) to remove surface oxides, then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally use hot air Drying can obtain the pretreated titanium-based alloy. Dissolve ammonium fluoride, potassium fluoride and sodium fluoride in deionized water at a molar ratio of 20:1.5:2 and stir at room temperature for 2 hours to prepare a salt solution with a total concentration of halogen salt of 2 wt%. Immerse the titanium-based alloy in a salt solution, place it in a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, put it in an oven, and conduct a hydrothermal treatment at a temperature of 180°C for 10 hours. After completion, it is cooled naturally, rinsed with deionized water, and dried in the air. Finally, a titanium-aluminum alloy sample containing F on the surface was obtained. Subsequent...

Embodiment 3

[0057] First, carry out conventional pretreatment on titanium-based alloys: use sandpaper to polish the 3Ti-Al alloy sample (titanium-aluminum atomic ratio is 3:1) to remove surface oxides, then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally use hot air Drying can obtain the pretreated titanium-based alloy. Dissolve ammonium fluoride, potassium fluoride and sodium fluoride in deionized water at a molar ratio of 20:1.5:1 and stir at room temperature for 2 hours to prepare a salt solution with a total concentration of halogen salt of 2 wt%. Immerse the titanium-based alloy in a salt solution, put it in a polytetrafluoroethylene-lined stainless steel hydrothermal kettle, put it in an oven, and conduct a hydrothermal treatment at a temperature of 150°C for 10 hours. After completion, it is cooled naturally, rinsed with deionized water, and dried in the air. Finally, a titanium-aluminum alloy sample containing F on the surface was obtained. Subsequently...

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Abstract

The invention relates to the field of surface treatment of alloy materials, in particular to a method for improving the high-temperature oxidation resistance of titanium-based alloys through hydrothermal treatment. The method comprises the following steps: preparing a salt solution with a halogen salt containing halogen elements, placing the titanium-based alloy in the salt solution, placing it in a sealed reactor for at least one hydrothermal treatment, and finally cooling, cleaning and drying. The method of the present invention can effectively improve the high-temperature oxidation resistance of the titanium-based alloy; can avoid the problem of the decline in the mechanical properties of the titanium-based alloy; the processing method is simple and efficient, the operation is less difficult, the cost is lower, and the demand for equipment is also lower. The processing efficiency is higher, and it is more suitable for industrial production.

Description

technical field [0001] The invention relates to the field of surface treatment of alloy materials, in particular to a method for improving the high-temperature oxidation resistance of titanium-based alloys through hydrothermal treatment. Background technique [0002] TiAl-based intermetallic compound alloys (TiAl alloys for short) have the characteristics of low density (50% of Ni-based alloys widely used at present), high specific strength and specific stiffness, and good high-temperature creep properties. It can be widely used in high-temperature components of automobiles or aero-engines, such as compressor blades, exhaust valves and turbochargers, etc., especially in aviation high-temperature structural materials, TiAl-based alloys are ideal materials for replacing nickel-based superalloys, and are It is considered to be one of the new lightweight high-temperature structural materials with great application prospects. However, when the TiAl alloy is used at a temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C22/34
CPCC23C22/34
Inventor 伍廉奎李哲轩曹发和
Owner SUN YAT SEN UNIV
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