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Protection coating for TiAl alloy, and production method thereof

A protective coating and alloy technology, applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of high porosity of the coating, uneven distribution of internal stress of the coating, micro cracks on the coating surface, etc. , to achieve the effects of simple process, improved oxidation resistance of the alloy, and easy operation

Active Publication Date: 2018-07-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the high porosity of the coating in the prior art, the uneven distribution of the internal stress of the coating, and the lack of micro-cracks on the coating surface, the present invention proposes a protective coating for TiAl alloy and its preparation method

Method used

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  • Protection coating for TiAl alloy, and production method thereof
  • Protection coating for TiAl alloy, and production method thereof
  • Protection coating for TiAl alloy, and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, an 800°C high-temperature oxidation-resistant coating is prepared on a TiAl alloy. The TiAl alloy is Ti-45Al-8.5Nb-0.2W.

[0037] The high-temperature oxidation-resistant coating is composed of a transition coating sprayed on the surface of the TiAl matrix alloy and a ceramic coating sprayed on the surface of the transition coating; the thickness of the transition coating is 90 μm, and the thickness of the ceramic coating is 280 μm.

[0038] The transition coating is formed by spraying alloy powder NiCoCrAlY, and its chemical composition is as follows: 46% Ni, 18% Cr, 23% Co, 12% Al, 1% Y. Powder particle size: 45 ~ 105μm.

[0039] The ceramic coating consists of 87wt.% Al 2 o 3 and 13wt.% TiO 2 It is sprayed with mixed powder, and the particle size of the powder is 15-45 μm.

[0040] The preparation process of the TiAl alloy anti-oxidation coating proposed in this implementation example is as follows:

[0041] Step 1, sample preparation: cut the...

Embodiment 2

[0048] In this example, an 800°C high-temperature oxidation-resistant coating is prepared on a TiAl alloy. The TiAl alloy is Ti-45Al-8.5Nb-0.2W.

[0049] The high-temperature oxidation-resistant coating is composed of a transition coating sprayed on the surface of the TiAl matrix alloy and a ceramic coating sprayed on the surface of the transition coating; the thickness of the transition coating is 100 μm, and the thickness of the ceramic coating is 300 μm.

[0050]The transition coating is formed by spraying alloy powder NiCoCrAlY, and its chemical composition is as follows: 46% Ni, 18% Cr, 23% Co, 12% Al, 1% Y. Powder particle size: 45 ~ 105μm.

[0051] The ceramic coating consists of 87wt.% Al 2 o 3 and 13wt.% TiO 2 It is sprayed with mixed powder, and the particle size of the powder is 15-45μm.

[0052] The preparation process of the TiAl alloy anti-oxidation coating proposed in this implementation example is as follows:

[0053] Step 1: Sample preparation: Cut the ...

Embodiment 3

[0060] In this example, an 800°C high-temperature oxidation-resistant coating is prepared on a TiAl alloy. The TiAl alloy is Ti-45Al-8.5Nb-0.2W.

[0061] The high-temperature oxidation-resistant coating is composed of a transition coating sprayed on the surface of the TiAl matrix alloy and a ceramic coating sprayed on the surface of the transition coating; the thickness of the transition coating is 100 μm, and the thickness of the ceramic coating is 300 μm.

[0062] The transition coating is formed by spraying alloy powder NiCoCrAlY powder, and its chemical composition is as follows: 46% Ni, 18% Cr, 23% Co, 12% Al and 1% Y. Powder particle size: 45 ~ 105μm.

[0063] The ceramic coating consists of 87wt.% Al 2 o 3 and 13wt.% TiO 2 It is sprayed with mixed powder, and the particle size of the powder is 15-45μm.

[0064] The preparation process of the TiAl alloy anti-oxidation coating proposed in this implementation example is as follows:

[0065] Step 1, sample preparatio...

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Abstract

The invention relates to a protection coating for TiAl alloy, and a production method thereof. The protection coating for the TiAl alloy is characterized in that a transition coating is produced on the surface of a TiAl base alloy through a plasma spraying technology, and a ceramic coating is produced on the surface of the transition coating; the coatings can effectively improve the oxidation resistance of the alloy and maintain the mechanical properties of the TiAl alloy in order to meet the requirements of the alloy used as a structural material in a high temperature environment, and the addition of a proper amount of TiO2 can improve the large porosity, poor compactness and other defects of the coating; and the transition coating can enhance the bonding strength between the alloy and the coating, and also can solve the oxygen atom penetration problem caused by the untightness of the ceramic coating, and further enhances the oxidation resistance of the alloy. The method adopted by the invention has the advantages of simplicity, convenience in operation, and high efficiency.

Description

technical field [0001] The invention relates to an anti-oxidation coating for metal, in particular to preparing a high-temperature anti-oxidation coating on the surface of a TiAl alloy by using a plasma spraying method, and belongs to the technical field of thermal spraying surface treatment. Background technique [0002] With the rapid development of the aviation and aerospace industries, the requirements for the engines of aviation and aerospace vehicles are becoming more and more stringent. Turbine blades are the core components of aero-engines. They have always been in high-temperature, high-pressure, high-speed gas corrosion working environments, and are subjected to cyclic alternating loads and dynamic loads such as centrifugal force, aerodynamic force, and temperature stress. The service environment is very harsh. This requires that the high-temperature structural materials used have performance characteristics such as high temperature resistance, high specific streng...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C23C4/02C23C4/073
CPCC23C4/02C23C4/073C23C4/11C23C4/134
Inventor 张铁邦张昆吴泽恩宋霖
Owner NORTHWESTERN POLYTECHNICAL UNIV
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