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Preparation method of high-temperature abradable sealing coating

A sealing coating and abrasion technology, applied in coating, metal material coating process, sustainable transportation, etc., can solve problems such as fracture, stress concentration, failure, etc., achieve high deposition efficiency, low cost, high thermal insulation performance effect

Active Publication Date: 2012-11-21
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During long-term high-temperature service, due to the stress concentration caused by the metal oxidation of the bonding layer and the discontinuous change of coating properties, the coating will follow the thermally grown oxide layer (TGO) layer or TGO and the bonding layer or abradable layer. The interface breaks and fails

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The substrate is made of Ni-based single crystal superalloy, and the surface of the substrate is pretreated by sand blowing before spraying: 60 mesh corundum sand is used for sand blowing at a pressure of 0.4 MPa, and then acetone cleaning or compressed gas is used to remove residual sand on the surface of the workpiece , And then prepare the surface coating.

[0022] Use commercially available spherical NiCoCrAlYTa powder (component A) and alumina powder (component B) with particle sizes of 30μm~60μm and 15μm~45μm respectively; the NiCoCrAlY powder and alumina powder are respectively loaded into two powder feeders, Using acetylene and oxygen as fuel gas, by adjusting the spray gun program, the fuel filling rate of component A is 20%, the oxygen-fuel ratio is 1.06, the fuel-filling rate of component B is 70%, the oxygen-fuel ratio is 1.60, and the spot overlap rate is 40%. The spray gun speed is 4 times / second. By adjusting the ratio of the spray gun points of the two prog...

Embodiment 2

[0026] The substrate is made of Ni-based single crystal superalloy, and the surface of the substrate is pretreated by sand blowing before spraying: 60 mesh corundum sand is used for sand blowing at a pressure of 0.4 MPa, and then acetone cleaning or compressed gas is used to remove residual sand on the surface of the workpiece , And then prepare the surface coating.

[0027] Use commercially available spherical NiCoCrAlYHf powder (component A) and alumina powder (component B) with particle sizes of 30μm~60μm and 15μm~45μm respectively; the NiCoCrAlYHf powder and alumina powder are respectively loaded into two powder feeders, Using acetylene and oxygen as fuel gas, by adjusting the spray gun program, the filling rate of component A fuel is 25%, the oxygen-fuel ratio is 1.20, the filling rate of component B fuel is 60%, the oxygen-fuel ratio is 2..00, and the spot overlap rate 40%, spray gun speed 4 times / sec. By adjusting the ratio of the two program spray gun points, the gradient...

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Abstract

The invention belongs to the technology of high temperature surface protection, and particularly relates to a preparation method of a high-temperature abradable sealing coating. The high-temperature abradable sealing coating comprises a bonding bottom layer, an oxygen barrier layer, a thermal insulation layer, and an abradable surface layer; the abradable surface layer comprises the following components by weight: 80%-95% of ZrO2, 5%-15% of polyester, and 0.5-5% of hBN; spraying powder is prepared by a high-energy ball milling method and is kept in reserve; before spraying of a workpiece surface, the workpiece surface is pretreated by grit blasting, and then each layer is prepared respectively by thermal spraying technology. The coating deposition efficiency is high, and the cost is low. Meanwhile, the coating has high thermal insulation performance, antioxidation performance, and abradability; the thermal cycle life of the coating at 1150 DEG C is up to more than 150 cycles, and the thermal shock life at 1150 DEG C is up to more than 1000 shocks; the structure-abradable sealing coating has a service temperature of up to 1200 DEG C.

Description

Technical field [0001] The invention belongs to high-temperature surface protection technology, and specifically relates to a method for preparing a high-temperature abradable sealing coating. Background technique [0002] With the increasing development of the aviation industry, higher and higher requirements are put forward for the performance of aero engines. The technology of reducing the compressor, the gas path sealing between the turbine blade tip and the casing has become one of the key technologies to improve engine efficiency and power output. After decades of development, a relatively complete sealing coating material system has been formed at home and abroad. The abradable sealing coating material at 350~650℃ is made of AISi-polyphenyl resin, AISi-graphite, Ni- Graphite is the representative; the abradable sealing coating material at 650~900℃ is represented by NiCrAlY-BN / polyester, NiCr-diatomite, Ni-diatomite; it can be abraded and sealed at high temperature above 1...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/10C23C4/08C23C4/073C23C4/11C23C4/126C23C4/134
CPCY02T50/60
Inventor 崔永静汤智慧王长亮郭孟秋
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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