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Method of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation

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: 2012-04-25
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 of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation
  • Method of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation
  • Method of preparing CoAlNi coating on Ni-based high-temperature alloy through pack cementation

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preparation example Construction

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

[0030] The first step: pretreatment of the substrate

[0031] (A) Ni-based superalloy is subjected to surface polishing treatment with 800# SiC water abrasive paper to obtain the first sample;

[0032] The surface roughness of the first sample is Ra1.6;

[0033] (B) Put the first sample into absolute ethanol and perform ultrasonic cleaning for 10 to 15 minutes to obtain the second sample;

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

[0035] Prepare 100g of embedding material by 6g~8g of Al powder with a particle size of 100 mesh, 15g~25g of Co powder with a particle size of 100 mesh, 2g~8g of NH with a particle size of 100 mesh 4 Cl powder and the remaining particle size is 100 mesh Al 2 o 3 powder composition;

[0036] In the present invention, the added A...

Embodiment 1

[0046] The substrate is Ni-10Co-9Cr-7.5W-5.4Al-4.1Ta-2.5Mo-1.8Hf-1.2Ti (brand DZ125).

[0047] The first step: pretreatment of the substrate

[0048] (A) Ni-based superalloy is subjected to surface polishing treatment with 800# SiC water abrasive paper to obtain the first sample;

[0049] The surface roughness of the first sample is Ra1.6;

[0050] (B) Put the first sample into absolute ethanol and perform ultrasonic cleaning for 10 to 15 minutes to obtain the second sample;

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

[0052] Prepare 100g of embedded seepage 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, 4g of NH with a particle size of 100 mesh 4 Cl powder and the remaining particle size is 100 mesh Al 2 o 3 powder composition;

[0053] In the present invention, the added Al 2 o 3The powder does not participate in the reaction during the embedding infiltration process, but onl...

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) Ni-based superalloy is subjected to surface polishing treatment with 800# SiC water abrasive paper to obtain the first sample;

[0070] The surface roughness of the first sample is Ra1.6;

[0071] (B) Put the first sample into absolute ethanol and perform ultrasonic cleaning for 10 to 15 minutes to obtain the second sample;

[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, 8g of NH with a particle size of 100 mesh 4 Cl powder and the remaining particle size is 100 mesh Al 2 o 3 powder composition;

[0074] In the present invention, the added Al 2 o 3 The powder does not participate in the reaction during the embedding infiltration process, but only acts as a filler. On th...

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Abstract

The invention discloses a method of preparing a CoAlNi coating on Ni-based high-temperature alloy through pack cementation. The thickness of the CoAlNi coating is 10-30mu m, and the CoAlNi coating contains two phases Al0.9Ni1.1 and AlCo. A continuous and dense Al2O3 oxide layer can be formed through high-temperature oxidation of the prepared CoAlNi coating at 1050 DEG C so as to prevent further oxidation of the coating and a substrate and improve the resistance of the substrate against the high-temperature oxidation. The prepared CoAlNi coating has good resistance against hot corrosion at thehigh temperature of 900-950 DEG C.

Description

technical field [0001] The present invention relates to a kind of high-temperature coating, more particularly, refers to a kind of method of preparing CoAlNi coating on Ni-based high-temperature alloy by adopting embedding infiltration technology. 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 ...

Claims

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Application Information

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