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Preparation method of titanium base alloy high-temperature-resistant oxide composite coating layer

A technology for resisting high temperature oxidation and titanium-based alloys is applied in the coating process of metal materials, coating, and plating of superimposed layers. Achieve the effect of improving high temperature oxidation resistance, simple preparation process and excellent bonding force

Active Publication Date: 2016-06-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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, 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 internal stress of the ceramic coating is large and the bonding strength with the substrate is relatively weak. Low; the thermal expansion coefficient difference between the diffusion coating and the substrate is large

Method used

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  • Preparation method of titanium base alloy high-temperature-resistant oxide composite coating layer
  • Preparation method of titanium base alloy high-temperature-resistant oxide composite coating layer
  • Preparation method of titanium base alloy high-temperature-resistant oxide composite coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, the titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 1:1) was polished to remove surface oxides with sandpaper, then ultrasonically cleaned in acetone and ethanol for 10 min, and finally dried with hot air for use. Add 50 mL of absolute ethanol, 50 mL of water, and 1 mL of tetraethyl orthosilicate (TEOS) to the beaker in sequence, and use 0.5 mol·L -1 Adjust the pH to about 2.0 with HAc, stir at room temperature for 2 h and set aside. The polished and cleaned titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 1:1) is used as the cathode, and the graphite electrode is used as the counter electrode. The electrode spacing is controlled at 1cm, and the current density is controlled at -0.1mA·cm -2 Electrodeposition was performed, and the deposition time was 1000s. After the deposition was completed, the working electrode was rinsed with deionized water and then dried at 40° C. to obtain a micronano oxide coating. Thereafter, using the...

Embodiment 2

[0033] First, the titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 1:1) was polished to remove surface oxides with sandpaper, then ultrasonically cleaned in acetone and ethanol for 10 min, and finally dried with hot air for use. Add 100mL of absolute ethanol, 75mL of water, 10mL of orthomethylsilicate (TMOS) to the beaker in sequence, and use 2.0mol·L -1 HNO 3 Adjust the pH to about 6.0, and stir at room temperature for 6 h for later use. The polished and cleaned titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 3:1) is used as the cathode, and the graphite electrode is used as the counter electrode. The electrode spacing is controlled at 10cm, and the current density is controlled at -5.0mA·cm -2 Electrodeposition was performed, and the deposition time was 30s. After the deposition was completed, the working electrode was rinsed with deionized water and then dried at 150° C. to obtain a micronano oxide coating. Thereafter, using the titanium...

Embodiment 3

[0037]First, the titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 1:1) was polished to remove surface oxides with sandpaper, then ultrasonically cleaned in acetone and ethanol for 10 min, and finally dried with hot air for use. Add 75 mL of absolute ethanol, 100 mL of water, 3 mL of tetraethyl orthosilicate (TEOS) and 2 mL of orthomethyl orthosilicate (TMOS) to the beaker in sequence, and use 1.0 mol·L -1 Adjust the pH to about 6.0 with HCl, stir at room temperature for 6 h and set aside. The polished and cleaned titanium-aluminum alloy sample (titanium-aluminum atomic ratio is 3:1) is used as the cathode, and the graphite electrode is used as the counter electrode. The electrode spacing is controlled at 5cm, and the current density is controlled at -5.0mA·cm -2 Electrodeposition was performed, and the deposition time was 30s. After the deposition was completed, the working electrode was rinsed with deionized water and then dried at 150° C. to obtain a microna...

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Abstract

The invention discloses a preparation method of a titanium base alloy high-temperature-resistant oxide composite coating layer. The preparation method comprises the following steps: 1) firstly, surface oxides on a titanium base alloy basal body are removed for cleaning and drying; 2) anhydrous ethanol, water and silicic acid alkyl ester are mixed to adjust the pH within 2.0-6.0, and are stirred by 2-48 h at room temperature to obtain precursor solution; 3) the precursor solution is added in two electrode tanks; the titanium base alloy basal body, treated in the step 1), serves as a working electrode; a platinum sheet or graphite serves as a counter electrode; the electrode gap is controlled within 1-10 cm; the current density is controlled within 0.1-5.0 mA.cm2; the electric deposition is performed by 30-2000 s; after the deposition is finished, the working electrode is dried at 40-150 DEG C after water washing; and a micronanometer oxide coating layer is obtained on the surface of the titanium base alloy; 4) a metal aluminum coating layer with a thickness of 1-30 microns is prepared on the surface of the micronanometer oxide coating layer of the titanium base alloy; and 5) the titanium base alloy, covered with two coating layers, is thermally treated by 10-60 min at 600-700 DEG C in air to prepare the titanium base alloy high-temperature-resistant oxide composite coating layer.

Description

technical field [0001] The invention belongs to the field of high-temperature oxidation resistance of metal materials, and in particular relates to a preparation method of a titanium-based alloy high-temperature oxidation resistance composite coating. technical background [0002] Titanium-aluminum alloy has the advantages of low density, high specific strength, high elastic modulus, and good high-temperature creep resistance. It is a high-temperature material with great application prospects. part. However, the actual use temperature of titanium-aluminum alloy is limited to below 750°C, because at higher temperatures, titanium and aluminum have similar affinity with oxygen, and TiO is formed on the surface of the alloy. 2 and Al 2 o 3 In the mixed layer, the growth rate of the oxide film is very fast, and it is easy to peel off. [0003] In order to overcome the above shortcomings, scholars at home and abroad have adopted methods such as alloying, ion implantation, surf...

Claims

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Application Information

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IPC IPC(8): C23C28/04C25D9/04
CPCC23C28/04C25D9/04
Inventor 胡吉明伍廉奎刘艳华
Owner ZHEJIANG UNIV