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Pyrogenic oxidation resistant nickel-aluminium-dysprosium coat bond material and preparation of hot screening coating

A high-temperature oxidation resistance and bonding layer technology, applied in metal material coating process, coating, ion implantation plating and other directions, can solve problems such as aluminum consumption, peeling, oxide film peeling, etc., to achieve low oxidation rate, not easy to peel off , good adhesion effect

Inactive Publication Date: 2009-08-05
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, NiAl has some disadvantages: when oxidized at high temperature, aluminum is consumed due to the formation of oxide film, which induces martensitic transformation, resulting in severe shrinkage and peeling of the oxide film; on the other hand, in the metal / oxide film A large number of voids are easy to form at the interface, which affects the adhesion of the oxide film and causes the oxide film to fall off

Method used

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  • Pyrogenic oxidation resistant nickel-aluminium-dysprosium coat bond material and preparation of hot screening coating
  • Pyrogenic oxidation resistant nickel-aluminium-dysprosium coat bond material and preparation of hot screening coating
  • Pyrogenic oxidation resistant nickel-aluminium-dysprosium coat bond material and preparation of hot screening coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Manufacture Ni 50 al 49.95 Dy 0.05

[0040] According to the nominal composition is Ni 50 Al 49.95 Dy 0.05 For batching, the purity of the raw materials nickel and aluminum is 99.999%, and the purity of dysprosium is 99.99%.

[0041] Vacuum arc melting Ni 50 Al 49.95 Dy 0.05 Ingot, vacuum degree is 5×10 -4 Pa, the melting temperature is 2500°C, and it can be smelted evenly after 4 times of smelting.

[0042] It is found that Dy is mainly distributed along NiAl grain boundaries by scanning electron microscope observation.

[0043] Cut the sample out of 10×10×3mm by wire cutting method 3 The small piece was smoothed with sandpaper, then ultrasonicated with acetone and alcohol for 15 minutes, and then the sample was dried. Oxidation at 1200°C for 305 hours, the oxidation weight gain is about 0.5mg / cm 2 .

[0044] Observing the surface and cross-sectional morphology after oxidation with a scanning electron microscope, it was found that the oxide f...

Embodiment 2

[0055] Example 2 : Ni 50 Al 49.9 Dy 0.1

[0056] According to the nominal composition is Ni 50 Al 49.9 Dy 0.1 For batching, the purity of the raw materials nickel and aluminum is 99.999%, and the purity of dysprosium is 99.99%.

[0057] Vacuum arc melting Ni 50 Al 49.9 Dy 0.1 Ingot, vacuum degree is 5×10 -4 Pa, it can be smelted evenly after 4 times of smelting.

[0058] It is found that Dy is mainly distributed along NiAl grain boundaries by scanning electron microscope observation.

[0059] Cut the sample out of 10×10×3mm by wire cutting method 3 The small piece was smoothed with sandpaper, then ultrasonicated with acetone and alcohol for 15 minutes, and then the sample was dried. Oxidation at 1200°C for 305 hours, the oxidation weight gain is about 1.0mg / cm 2 .

[0060] Observing the surface and cross-sectional morphology after oxidation with a scanning electron microscope, it was found that the oxide film peeled off little, the oxide film was straight, and ...

Embodiment 3

[0069] Example 3: Manufacture Ni 55 al 44.5 Dy 0.5

[0070] According to the nominal composition is Ni 55 al 44.5 Dy 0.5 For batching, the purity of the raw materials nickel and aluminum is 99.999%, and the purity of dysprosium is 99.99%.

[0071] Vacuum arc melting Ni 55 al 44.5 Dy 0.5 Alloy ingot, vacuum degree is 5×10 -4 Pa, the melting temperature is 2500°C, and it can be smelted evenly after 4 times of smelting.

[0072] It is found that Dy is mainly distributed along NiAl grain boundaries by scanning electron microscope observation.

[0073] Cut the sample out of 10×10×3mm by wire cutting method 3 The small piece was smoothed with sandpaper, then ultrasonicated with acetone and alcohol for 15 minutes, and then the sample was dried. Oxidation at 1200°C for 305 hours, the oxidation weight gain is about 1.5mg / cm 2 .

[0074] The process of preparing thermal barrier coating on the substrate by electron beam physical vapor deposition method is as follows:

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Abstract

The invention discloses a nickel-aluminum-dysprosium thermal barrier coating bonding layer material resistant to high temperature oxidation. It is composed of 40-50 aluminum Al and the balance nickel Ni with a purity of 99.999%. The Dy element in the bonding layer material obtained by smelting is mainly distributed along the NiAl grain boundary. The substrate prepared with the nickel-aluminum-dysprosium bonding layer material is oxidized at 1200°C for 300 hours, the oxidation weight gain is about 0.5-1.5mg / cm2, and the oxide film formed on the surface of the substrate has almost no peeling off.

Description

technical field [0001] The present invention relates to a bonding layer material used in thermal barrier coatings, more particularly, it refers to a high-temperature oxidation-resistant bonding material that uses rare earth element Dy to modify NiAl, which can be used in a high-temperature environment of 1200 ° C. layer material. Background technique [0002] The development of advanced gas turbine engines constantly puts forward new and higher requirements for its blades. The turbine inlet temperature (TIT) of an engine with a thrust-to-weight ratio above 15 is as high as 2000°C or above, which requires the turbine blades and guide vanes to work stably at a temperature above 1400°C for a long time. In order to adapt to this harsh working environment and meet the development needs of aero-engines, in addition to the development of high-efficiency cooling technology and high-temperature alloy material technology, it is necessary to develop thermal barrier coatings (Thermal B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C19/03C22C30/00C22C1/02C23C14/30C23C14/54
Inventor 郭洪波王晓燕宫声凯王世兴
Owner BEIHANG UNIV