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Method for improving high temperature oxidation resistance of titanium-based alloy on basis of halide effect and ceramic coating obtained through pretreatment

A technology for resisting high temperature oxidation and titanium-based alloys, applied in electrolytic inorganic material coating and other directions, can solve the problems of expensive equipment, low production efficiency, decreased mechanical properties of TiAl alloys, etc., and achieve the effects of simple preparation process, convenient operation and easy realization.

Active Publication Date: 2017-06-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second is to add a third or more alloying elements, such as: Nb, Sb, Si, Cr, Y, Mo, etc. Although the high-temperature oxidation resistance of TiAl alloys can be effectively improved, too high additions usually lead to TiAl alloys Decreased mechanical properties
Although the ion implantation method has controllable implantation amount and good repeatability, the equipment involved is more expensive and the production efficiency is lower, and the depth of changing the composition of TiAl alloy is limited to the shallow range of the surface (<1μm)
The protective coating, such as metal coating MCrAl (Y), ceramic coating (such as SiO 2 、Al 2 o 3 and ZrO 2 etc.) and diffusion coatings (such as Al, Si, etc.) can be used as a shielding layer to prevent oxygen from penetrating into the substrate, but there are still certain problems
The interdiffusion between the metal coating and the substrate is serious, and the interface is easy to precipitate hard and brittle phases, and Kirkendall holes are generated at the same time, which seriously reduces the bonding strength between the coating and the substrate; the thermal expansion coefficient of the diffusion coating and the substrate differs greatly

Method used

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  • Method for improving high temperature oxidation resistance of titanium-based alloy on basis of halide effect and ceramic coating obtained through pretreatment
  • Method for improving high temperature oxidation resistance of titanium-based alloy on basis of halide effect and ceramic coating obtained through pretreatment
  • Method for improving high temperature oxidation resistance of titanium-based alloy on basis of halide effect and ceramic coating obtained through pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First, polish the titanium-aluminum alloy sample (the atomic ratio of titanium to aluminum is 1:1) with sandpaper to remove surface oxides, and then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally dry it with hot air for use. Add 1 mol of ammonia acetate, 0.1 mol of ammonium chloride, 0.2 mol of ammonium hexafluorosilicate, and 100 mL of water to the beaker in turn, and stir for 40 hours at room temperature for later use. The polished and cleaned titanium aluminum alloy sample (the atomic ratio of titanium to aluminum is 1:1) is used as the cathode, the graphite electrode is used as the counter electrode, the Ag / AgCl electrode is used as the reference electrode, the electrode spacing is controlled at 1cm, and the deposition potential is controlled at -1V , The deposition time is 1500s, after the deposition is completed, the working electrode is rinsed with deionized water and then dried at 40℃ to obtain F-containing micro-nano SiO 2 coating. Su...

Embodiment 2

[0035] First use sandpaper to polish the titanium-aluminum alloy sample (the atomic ratio of titanium to aluminum is 3:1) to remove surface oxides, and then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally dry it with hot air for use. Add 2 mol of ammonia acetate, 0.15 mol of ammonium chloride, 0.2 mol of potassium hexafluorosilicate, and 100 mL of water to the beaker in turn, and stir at room temperature for 40 hours until use. The polished and cleaned titanium aluminum alloy sample (the atomic ratio of titanium to aluminum is 3:1) is used as the cathode, the graphite electrode is used as the counter electrode, the Ag / AgCl electrode is used as the reference electrode, the electrode spacing is controlled at 10cm, and the deposition voltage is controlled at -3.0 V, the deposition time is 500s. After the deposition is completed, the working electrode is rinsed with deionized water and dried at 150°C to obtain F-containing micro-nano SiO 2 coating. Subseq...

Embodiment 3

[0039] First use sandpaper to polish the titanium-aluminum alloy sample (the atomic ratio of titanium to aluminum is 3:1) to remove surface oxides, and then ultrasonically clean it in acetone and ethanol for 10 minutes, and finally dry it with hot air for use. Add 2 mol of ammonia acetate, 0.15 mol of ammonium chloride, 0.1 mol of ammonium hexafluorosilicate, 0.1 mol of potassium hexafluorosilicate, and 100 mL of water to the beaker in turn, and stir at room temperature for 20 hours until use. The polished and cleaned titanium-aluminum alloy sample (the atomic ratio of titanium to aluminum is 3:1) is used as the cathode, the graphite electrode is used as the counter electrode, the Ag / AgCl electrode is used as the reference electrode, the electrode spacing is controlled at 5cm, and the deposition potential is controlled at -3.0V , The deposition time is 500s, after the deposition is completed, the working electrode is rinsed with deionized water and dried at 150°C to obtain F-con...

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Abstract

A method for improving the high temperature oxidation resistance of titanium-based alloy on the basis of a halide effect and a ceramic coating obtained through pretreatment includes the following steps that (1) surface oxides of a titanium-based alloy substrate are removed at first, and then cleaning and drying are carried out; (2) ammonium acetate, ammonium chloride, fluosilicate and water are mixed and stirred at the room temperature for 2-48 h, and a precursor solution is obtained; (3) the prepared precursor solution is added into a three-electrode cell, electro-deposition is carried out by taking the titanium-based alloy substrate as a working electrode, taking a platinum sheet or graphite as a counter electrode and taking an Ag / AgCl electrode as a reference electrode, and a fluorine-containing micro-nano SiO2 coating is obtained; and (4) the titanium-based alloy with the surface provided with the fluorine-containing micro-nano SiO2 coating is subjected to heat treatment in a gas mixture of argon and oxygen, and the high temperature oxidation resistance composite coating of the titanium-based alloy is obtained. According to the method, the preparation process is simple, excellent binding force between the obtained coating and the substrate is achieved, and the high temperature oxidation resistance of the titanium-based alloy can be remarkably improved.

Description

Technical field [0001] The invention belongs to the field of high-temperature oxidation resistance of metal materials, and specifically relates to a method for improving the high-temperature oxidation resistance of titanium-based alloys by obtaining a ceramic coating based on halogen effect and pretreatment. [0002] technical background [0003] TiAl-based intermetallic compound alloys (TiAl alloys for short) have the characteristics of low density (50% of the currently widely used Ni-based alloys), high specific strength and stiffness, and better high-temperature creep performance. It can be widely used in high-temperature parts of automobiles or aero-engines, such as compressor blades, exhaust valves and supercharged turbines, etc., especially in aviation high-temperature structural materials. TiAl-based alloys are ideal materials to replace nickel-based superalloys. It is considered to be one of the new lightweight high temperature structural materials with great application pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/08
CPCC25D9/08
Inventor 伍廉奎吴伟耀侯广亚唐谊平曹华珍郑国渠
Owner ZHEJIANG UNIV OF TECH
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