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High temperature corrosion and ablation-resistant coating on surface of gamma-TiAl-based alloy and preparation method thereof

A high-temperature-resistant, base-alloy technology, applied in metal material coating process, coating, ion implantation plating, etc., can solve the problems of coating degradation and decomposition, reduction of oxidation resistance of nitride coatings, etc., to improve service life , reduce the degradation rate, and suppress the effect of interdiffusion

Inactive Publication Date: 2020-08-04
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

However, so far, the research results on the effect of nitride coating on the high-temperature oxidation resistance of γ-TiAl-based alloys show that [see literature: ① M,Braun R,LeyensC.Oxidation resistant coatings in combination with thermal barrier coatingsonγ-TiAl alloys for high temperature applications.Surface&CoatingsTechnology,2006,201:3911–3917;②Moser M,Mayrhofer P H,Clemens H.On the influence of coating on the mechanical properties of aγ-TiAl based alloy.Intermetallics,2008,16:1206–1211;③Braun R, Rovere F,Mayrhofer PH, et al.Environmental protection ofγ-TiAl based alloy Ti-45Al-8Nb by CrAlYNthin films and thermal barrier coatings .Intermetallics,2010,18:479–486], although coatings such as CrAlYN and TiAlCrYN improve the high-temperature oxidation resistance of γ-TiAl-based alloys to a certain extent at 800°C-900°C, but at high temperatures, especially at temperatures above 850°C , the diffusion of N in the nitride coating into the γ-TiAl-based alloy is serious, resulting in the degradation and decomposition of the coating. At the same time, a thicker nitride layer is formed on the surface of the alloy, and the oxidation resistance of the nitride coating is significantly reduced.

Method used

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  • High temperature corrosion and ablation-resistant coating on surface of gamma-TiAl-based alloy and preparation method thereof
  • High temperature corrosion and ablation-resistant coating on surface of gamma-TiAl-based alloy and preparation method thereof
  • High temperature corrosion and ablation-resistant coating on surface of gamma-TiAl-based alloy and preparation method thereof

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Embodiment 1

[0029] Using the γ-TiAl-based alloy Ti-48Al-2Cr-2Nb (atomic fraction, at.%) as the substrate, Ti was prepared by multi-arc ion plating 0.6 Al 0.3 Si 0.1 N anti-high temperature corrosion erosion coating.

[0030] (1) Prepare the alloy target: the TiAlSi multi-component alloy target prepared by the vacuum melting method is used as the cathode target, and the composition of the TiAlSi alloy target is Ti60-Al30-Si10 (at.%).

[0031] (2) Workpiece pretreatment: Cut the Ti-48Al-2Cr-2Nb alloy ingot into 15mm×10mm×2mm samples, grind, polish, ultrasonically clean in a mixed solution of alcohol and acetone, and dry it before use.

[0032] (3) Coating coating: TiAlSiN coating is deposited by multi-arc ion plating equipment. The TiAl sample is suspended on the sample holder facing the TiAlSi target and rotates. When the temperature of the vacuum chamber is heated to 200°C and the background vacuum reaches 6.0×10 -3 After Pa, argon gas was introduced at a pressure of 0.2 Pa, and a bia...

Embodiment 2

[0035] Using the γ-TiAl-based alloy Ti-46Al-2.5V-1Cr-0.3Ni (atomic fraction, at.%) as the substrate, Ti was prepared by multi-arc ion plating 0.5 Al 0.45 Si 0.05 N anti-high temperature corrosion erosion coating.

[0036] (1) Preparation of alloy target material, TiAlSi multi-component alloy target material prepared by vacuum smelting method is used as cathode target, and the composition of TiAlSi alloy target material is Ti50-Al45-Si5 (at.%).

[0037] (2) Pre-treatment of the workpiece, cutting the Ti-46Al-2.5V-1Cr-0.3Ni alloy ingot into a sample of 15mm×10mm×2mm, grinding, polishing, ultrasonic cleaning in a mixed solution of alcohol and acetone, drying and waiting use.

[0038] (3) Coating coating, using multi-arc ion plating equipment to deposit TiAlSiN coating. The TiAl sample is suspended on the sample holder facing the TiAlSi target and rotates. When the temperature of the vacuum chamber is heated to 200°C and the background vacuum reaches 6.0×10 -3 After Pa, argon...

Embodiment 3

[0042] Using the γ-TiAl-based alloy Ti-48Al-2Cr-2Nb (atomic fraction, at.%) as the substrate, Ti was prepared by multi-arc ion plating 0.5 Al 0.4 Si 0.1 N anti-high temperature corrosion erosion coating.

[0043] (1) Preparation of alloy target material, TiAlSi multi-component alloy target material prepared by vacuum melting method is used as cathode target, and the composition of TiAlSi alloy target material is Ti50-Al40-Si10 (at.%).

[0044](2) Workpiece pre-treatment: Cut the Ti-48Al-2Cr-2Nb alloy ingot into 15mm×10mm×2mm samples, grind and polish, ultrasonically clean in a mixed solution of alcohol and acetone, and dry it before use.

[0045] (3) Coating coating, using multi-arc ion plating equipment to deposit TiAlSiN coating. The TiAl sample is suspended on the sample holder facing the TiAlSi target and rotates. When the temperature of the vacuum chamber is heated to 200°C and the background vacuum reaches 6.0×10 -3 After Pa, argon gas was introduced at a pressure of...

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Abstract

The invention discloses a high temperature corrosion and ablation-resistant coating on the surface of a gamma-TiAl-based alloy and a preparation method thereof and belongs to the technical field of protective coatings. The coating is a TiAlSiN or CrAlSiN coating which is prepared by means of a vacuum physical vapor deposition method. A continuous Al2O3 layer can be formed in an oxidization film onthe surface of the coating in a high-temperature thermal exposure process of the coating, so that the coating has relatively good high-temperature oxidization resistance and ablation resistance. Moreover, the coating and a gamma-TiAl-based alloy interface can generate a diffusive barrier layer such as Ti5Si3 in situ at a high temperature, so that counterdiffusion between the coating and the alloyis quite slight and the service life of the coating is prolonged greatly.

Description

technical field [0001] The invention relates to the technical field of protective coatings, in particular to a high-temperature corrosion-resistant coating on the surface of a γ-TiAl-based alloy and a preparation method thereof. Background technique [0002] γ-TiAl-based alloys are light in weight and high in strength, and have good application prospects as structural materials in aviation, energy, automobile and other industries. However, when it is used as a high-temperature structural material, such as an engine blade material at a temperature of 800 ° C or above, a thick titanium oxide and aluminum oxide mixed oxide film is formed on the surface, and the oxidation resistance is significantly reduced. After thermal exposure, the solid solution of oxygen on the alloy surface leads to increased brittleness of the alloy. Surface pretreatment or application of protective coating can significantly improve the high-temperature oxidation resistance of γ-TiAl-based alloys, such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/32
CPCC23C14/0021C23C14/0641C23C14/325
Inventor 辛丽章凯朱圣龙王世臣
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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