High-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and preparation method of high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating

A technology of high temperature oxidation resistance and bonding strength, which is applied in coatings, metal material coating processes, molten spraying, etc., can solve problems such as insufficient oxidation resistance, and achieve improved oxidation resistance, improved density, and oxidation resistance enhanced effect

Active Publication Date: 2019-12-03
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a high-temperature oxidation-resistant porous MCrAlY abradable coating to overcome the shortcomings of existing porous MCrAlY abradable sealing coatings such as insufficient oxidation resistance. The specific technical scheme is as follows

Method used

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  • High-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and preparation method of high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating
  • High-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and preparation method of high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating
  • High-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and preparation method of high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1: pretreat the substrate, and prepare the bottom layer by spraying MCrAlY powder with low-pressure plasma, and the thickness of the bottom layer is 150 μm;

[0031] Step 2: Prepare the surface layer by atmospheric plasma spraying and agglomerating composite MCrAlY / polyphenylene composite powder. The weight ratio of polyphenylene in the powder is 12%. The spraying process parameters are: power 28kW, spray distance 120mm, powder feeding rate 40g / min, the substrate preheating temperature is 120°C, and the coating thickness of the surface layer is 2mm;

[0032] Step 3: Put the sprayed coating in an atmospheric resistance furnace, raise it from room temperature to 500 °C at a rate of 10 °C / min, keep it warm for 4 hours, and cool to room temperature with the furnace;

[0033] Step 4: Put the coating in a vacuum heat treatment furnace, raise it from room temperature to 1050 °C at a rate of 8 °C / min, keep it warm for 2 hours, and cool with the furnace to complete the coa...

Embodiment 2

[0035] Step 1: pretreat the substrate, and prepare the bottom layer by supersonic flame spraying MCrAlY powder, the thickness of the bottom layer is 120 μm;

[0036] Step 2: Prepare the surface layer by atmospheric plasma spraying and agglomerating composite MCrAlY / polyphenylene ester composite powder. The weight ratio of polyphenylene ester in the powder is 15%. The spraying process parameters are: power 28kW, spray distance 120mm, powder feeding rate 40g / min, the substrate preheating temperature is 120°C, and the coating thickness of the surface layer is 2mm;

[0037] Step 3: Put the sprayed coating in an atmospheric resistance furnace, raise it from room temperature to 500 °C at a rate of 10 °C / min, keep it warm for 5 hours, and cool to room temperature with the furnace;

[0038] Step 4: Put the coating in a vacuum heat treatment furnace, raise it from room temperature to 1100 °C at a rate of 15 °C / min, keep it warm for 4 hours, and cool with the furnace to complete the co...

Embodiment 3

[0040] Step 1: pretreat the substrate, and prepare the MCrAlY bottom layer by magnetron sputtering process, with a thickness of 90 μm;

[0041] Step 2: Use atmospheric plasma spraying to mechanically mix MCrAlY / polyphenylene composite powder to prepare the surface layer. The weight ratio of polyphenylene in the powder is 8%. The spraying process parameters are: power 26kW, spray distance 120mm, powder feeding rate 40g / min, the substrate preheating temperature is 120°C, and the coating thickness of the surface layer is 2mm;

[0042] Step 3: Put the sprayed coating in an atmospheric resistance furnace, raise it from room temperature to 500 °C at a rate of 10 °C / min, keep it warm for 3.5 hours, and cool to room temperature with the furnace;

[0043] Step 4: Put the coating in a vacuum heat treatment furnace, raise it from room temperature to 1000 °C at a rate of 8 °C / min, keep it warm for 2 hours, and cool with the furnace to complete the coating preparation.

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Abstract

The invention discloses a high-bonding-strength high-temperature-oxidation-resistant porous MCrAlY abradable coating and a preparation method thereof, and belongs to the technical field of gas turbines. The preparation method comprises the following steps: preparing MCrAlY/pore-forming agent composite powder; preparing a bottom layer; thermally spraying MCrAlY/pore-forming agent composite powder on the bottom layer to prepare an MCrAlY surface layer; carrying out medium-temperature heat treatment under an atmospheric condition to remove the pore-forming agent, so as to obtain a porous MCrAlY surface layer; and carrying out high-temperature heat treatment under a vacuum condition to obtain the porous MCrAlY abradable coating. The porosity of the coating is 20-60%, the hardness is lower than85HR15Y, and the bonding strength is higher than 20MPa and is more than 2.5 times that of the prior art; and the antioxidant life at 1000 DEG C is longer than 2500h and is 2.7 times or more of that in the prior art. The high-pressure turbine blade tip gas path sealing device is widely applied to high-pressure turbine blade tip gas path sealing of aero-engines, ground gas turbines and marine gas turbines.

Description

technical field [0001] The invention relates to a method for preparing an abradable sealing coating used for sealing the air passage of an aeroengine, and belongs to the technical field of gas turbines. Background technique [0002] The abradable sealing coating is coated on the surface of the stator part of the gas turbine, and it can be actively worn when it is rubbed against the rotor part under high temperature and high speed conditions, so that the minimum gap between the rotor and the stator can be achieved through the interference fit of the rotor and the stator Control, while protecting rotor components from wear, is of great significance for reducing gas turbine fuel consumption, improving efficiency and operating safety. [0003] Due to its loose and porous characteristics, abradable sealing coatings are susceptible to oxidation damage in high temperature environments, so the higher the temperature, the more difficult it is to design and prepare the coating. The a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/02C23C4/134C23C4/073C23C4/18
CPCC23C4/02C23C4/18C23C4/073C23C4/134
Inventor 于月光刘建明沈婕章德铭刘通黄凌峰候伟骜卢晓亮王帅郭丹
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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