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Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process

A high-temperature alloy and embedding infiltration technology, which is applied in the direction of coating, metal material coating process, solid-state diffusion coating, etc., can solve the problems of reducing the oxidation resistance and thermal corrosion resistance of high-temperature alloys

Inactive Publication Date: 2013-04-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the elements added to improve the high temperature strength of the alloy usually reduce the oxidation resistance and hot corrosion resistance of the superalloy.

Method used

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  • Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process
  • Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process
  • Method for preparing Y modified CoAlNi coating on Ni-based high temperature alloy by embedding infiltration process

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preparation example Construction

[0029] The present invention relates to a method for preparing a Y-modified CoAlNi coating on a Ni-based superalloy by adopting an embedding and infiltration process. The coating preparation method has the following steps:

[0030] The first step: pretreatment of the substrate

[0031] (A) The surface of the Ni-based superalloy was polished with 800# SiC water abrasive paper to obtain the first sample;

[0032] The surface roughness of the first sample is Ra=1.6;

[0033] (B) After putting the first sample into absolute ethanol for 10-15 minutes of ultrasonic cleaning, the second sample was obtained;

[0034] The second step: preparation of embedding seepage material

[0035] Prepare 100g of embedding material by 6-8g of Al powder with a particle size of 100 mesh, 15-25g of Co powder with a particle size of 100 mesh, and 1-3g of Y with a particle size of 100 mesh 2 o 3 Powder, 3~5g NH with a particle size of 100 mesh 4 Cl powder, 3-5g NH with a particle size of 100 mesh ...

Embodiment 1

[0046] The substrate is Ni-6.2Co-8.9Cr-7.0W-6.1Al-3.8Ta-2.0Mo-1.5Hf-1.0Ti (brand DZ125).

[0047] The first step: pretreatment of the substrate

[0048] (A) The surface of the Ni-based superalloy was polished with 800# SiC water abrasive paper to obtain the first sample;

[0049] The surface roughness of the first sample is Ra=1.6;

[0050] (B) After putting the first sample into absolute ethanol for 10-15 minutes of ultrasonic cleaning, the second sample was obtained;

[0051] The second step: preparation of embedding seepage material

[0052] Prepare 100g of embedding material by 7.6g of Al powder with a particle size of 100 mesh, 20g of Co powder with a particle size of 100 mesh, and 2g of Y powder with a particle size of 100 mesh. 2 o 3 Powder, 4g NH with a particle size of 100 mesh 4 Cl powder, 4g NH with a particle size of 100 mesh 4 I powder and the remaining particle size are 100 mesh Al 2 o 3 powder composition;

[0053] In the present invention, the added Al ...

Embodiment 2

[0067] The substrate is Ni-10Co-9Cr-12W-5Al-1.5Hf-2Ti (brand DZ22).

[0068] The first step: pretreatment of the substrate

[0069] (A) The surface of the Ni-based superalloy was polished with 800# SiC water abrasive paper to obtain the first sample;

[0070] The surface roughness of the first sample is Ra=1.6;

[0071] (B) After putting the first sample into absolute ethanol for 10-15 minutes of ultrasonic cleaning, the second sample was obtained;

[0072] The second step: preparation of embedding seepage material

[0073] Prepare 100g of embedding material by 6g of Al powder with a particle size of 100 mesh, 15g of Co powder with a particle size of 100 mesh, and 3g of Y powder with a particle size of 100 mesh. 2 o 3 Powder, 5g NH with a particle size of 100 mesh 4 Cl powder, 5g of NH with a particle size of 100 mesh 4 I powder and the remaining particle size are 100 mesh Al 2 o 3 powder composition;

[0074] In the present invention, the added Al 2 o 3 The powder ...

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Abstract

The invention discloses a method for preparing a Y modified CoAlNi coating on an Ni-based high temperature alloy by an embedding infiltration process. The thickness of the CoAlNiY coating is between 10 and 30 mu m. The CoAlNiY coating only comprises an Al0.9 Ni1.1 phase, wherein partial Ni atoms are replaced by Co atoms, and Y atoms exist in the Al0.9 Ni1.1 phase in the form of placeholder solid solution. Continuous and dense Al2O3 oxide layers can be formed on the prepared CoAlNiY coating C when the CoAlNiY coating is subjected to high-temperature cycle oxidation at the temperature of 1,050 DEG, so that the coating and a substrate can be prevented from being further oxidized, and the high-temperature cycle oxidation resistance of the substrate is improved. The CoAlNiY coating has higher thermal corrosion resistance at the high temperature of between 850 and 950 DEG C.

Description

technical field [0001] The invention relates to a high-temperature coating, more particularly to a method for preparing a Y-modified CoAlNi coating on a Ni-based superalloy by adopting an embedding infiltration process. Background technique [0002] Nickel-based superalloys usually have high mechanical strength and creep resistance at high temperatures, which makes them widely used in aviation jet engines, various industrial gas turbines and other hot-end components, such as engine blades. However, the elements added to improve the high temperature strength of the alloy usually reduce the oxidation resistance and hot corrosion resistance of the superalloy. An effective measure to solve this problem is to prepare a high-temperature protective coating on the surface of the alloy. Many researchers have done a lot of research, such as aluminizing the surface of the alloy, aluminizing silicon, chromizing silicon, aluminizing hafnium, etc. The research results show that these The...

Claims

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Application Information

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IPC IPC(8): C23C10/52
Inventor 周春根乔敏李海霞
Owner BEIHANG UNIV
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