Marine corrosion-resistant thermal spraying abradable seal coating and preparation method thereof

A sealing coating and thermal spraying technology, applied in coatings, metal material coating processes, mechanical equipment, etc., can solve the problem that the marine corrosion resistance of abradable sealing coatings is not listed, and there is no wearable sealing. Coating and other problems, to achieve the effect of improving comprehensive service performance, good corrosion resistance and good adhesion

Active Publication Date: 2018-06-26
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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Problems solved by technology

At present, the marine corrosion resistance of the abradable sealing coating is not included in the evaluat

Method used

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  • Marine corrosion-resistant thermal spraying abradable seal coating and preparation method thereof
  • Marine corrosion-resistant thermal spraying abradable seal coating and preparation method thereof

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[0028] Example 1

[0029] Step 1: Degrease the surface of the parts, use acetone or gasoline to wipe the spray area of ​​the parts to remove oil and debris;

[0030] Step 2: Use pressure sensitive tape to protect the non-spraying area before sand blowing;

[0031] Step 3: Perform surface roughening treatment on the parts, using a press-in sand blower, 40 mesh white corundum sand for treatment of the area to be sprayed, and the gas pressure is 0.2MPa;

[0032] Step 4: Atmospheric plasma spray NiAl alloy bottom layer on the parts to be sprayed. The particle size range of NiAl alloy powder used is between 50μm and 80μm. The specific spraying process parameters are: current 700A, argon flow 55L / min, and hydrogen flow 5.5L / min, the powder feeding rate is 20g / min, the spraying distance is 130mm, and the spraying angle is 90°; in terms of weight percentage, the chemical composition of the NiAl alloy bottom layer is: Ni 95%, Al 5%;

[0033] Step 5: Atmospheric plasma spray NiCrAl / BN surface l...

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Abstract

The invention belongs to the gas path seal coating technology of components such as the inner wall of an aero-engine compressor case, and particularly relates to a marine corrosion-resistant thermal spraying abradable seal coating and a preparation method thereof. The method comprises the following steps that (1), a bottom layer is prepared, and a NiAl bottom layer on the surface of a high-temperature alloy substrate is prepared by adopting an atmospheric plasma spraying method; and (2), an abradable surface layer is prepared, and a NiCrAl/BN surface layer is prepared on the NiAl bottom layerby adopting the atmospheric plasma spraying method, wherein NiCrAl/BN surface layer phases are composed of a NiCrAl alloy phase and a non-metal phase h-BN, and the prepared NiCrAl/BN surface layer isof a typical porous multi-phase structure. The corrosion-resistant seal coating has good marine environmental corrosion resistance, and decrement of the coating hardness, the bonding strength and thelike of the coating is low after the coating is subjected to marine environment corrosion, so that the use requirements of aero-engine gas path sealing are met.

Description

technical field [0001] The technology belongs to the gas path sealing coating technology for parts such as the inner wall of an aero-engine compressor case, and in particular relates to a marine corrosion-resistant thermal spraying wearable sealing coating and a preparation method thereof. Background technique [0002] At present, different abradable sealing coatings are used on the surface of the aero-engine from the fan, high-pressure compressor to the turbine casing. The sealing coating reduces the radial loss of airflow by reducing the gap between the casing and the tip of the blade. To improve engine efficiency and reduce fuel consumption. However, at present, abradable sealing coatings for aero-engines generally have weak corrosion resistance, and the coating performance decreases rapidly after corrosion, resulting in coating failure and flight accidents. Therefore, the development of abradable sealing coatings resistant to corrosion in marine environments is an inevi...

Claims

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Application Information

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IPC IPC(8): C23C4/06C23C2/02C22C19/05C22C19/03F01D25/00F04D29/02
Inventor 宋佳王璐张春刚李明康张佳平
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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