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Four-phase ceramic matrix high-temperature wearable sealing coating

A sealing coating and ceramic-based technology, which is applied in coatings, metal material coating technology, sustainable transportation, etc., can solve problems such as cracking, peeling, and failure of sealing coatings, and achieve relaxation of thermal stress and improvement of mechanical properties , high temperature stability and thermal shock resistance improvement effect

Inactive Publication Date: 2014-02-12
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The rapid diffusion of oxygen into the coating and the coating / bonding layer interface will promote the rapid growth of the TGO layer and the generation of defects at the interface, resulting in premature cracking and peeling of the sealing coating and failure

Method used

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  • Four-phase ceramic matrix high-temperature wearable sealing coating

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Comparison scheme
Effect test

Embodiment 1

[0023] 10wt% Al with a particle size of 20-40nm 2 o 3 The powder was mechanically mixed with DySZ+h-BN+polyester three-phase abradable powder for 12 hours to obtain a four-phase abradable composite powder for use. Use 46 mesh corundum sand to roughen the surface to be sprayed. The supersonic flame spraying process was used to spray NiCoCrAlY alloy powder on the surface of the roughened substrate to prepare the bonded bottom layer, with a thickness of about 150 μm. Spray doped nm-Al on the bonded underlayer by plasma spraying process 2 o 3 Four-phase ceramic-based high-temperature abradable sealing coating, the spraying parameters are: current 620A, voltage 70V, spraying distance 120mm, and the thickness of the sprayed coating is about 1000μm. Three-phase abradable sealing coating of DySZ+h-BN+polyester and doped nm-Al 2 o 3 The test results of the thermal shock resistance of the four-phase abradable sealing coating at 1150°C show that the addition of 10wt% fourth-phase n...

Embodiment 2

[0025] 5wt% SiO with a particle size of 20nm 2 The powder was mechanically mixed with DySZ+h-BN+polyester three-phase abradable powder for 8 hours to obtain a four-phase abradable composite powder for use. Use 46 mesh corundum sand to roughen the surface to be sprayed. NiCrAlY alloy powder was sprayed on the surface of the roughened substrate by detonation spraying process to prepare the bonded bottom layer with a thickness of about 150 μm. Spray doped nm-SiO on the bonded underlayer by plasma spraying process 2 Four-phase ceramic-based high-temperature abradable sealing coating. The spraying parameters are: current 600A, voltage 70V, spraying distance 100mm, and the thickness of the sprayed coating is about 1000μm. Three-phase abradable sealing coating of DySZ+h-BN+polyester and doped nm-Al 2 o 3 The test results of the thermal shock resistance of the four-phase abradable sealing coating at 1150°C show that the addition of 5wt% fourth-phase nano-SiO 2 The thermal shock r...

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Abstract

The invention belongs to the technical field of sealing coating materials and particularly relates to a four-phase ceramic matrix high-temperature wearable sealing coating. The coating is composed of four phases including a ceramic matrix phase, a lubricating phase, a pore-forming phase and a high-temperature antioxidant nanophase. A certain proportion of high-temperature antioxidant nanophase is added on the basis of the traditional two-phase or three-phase ceramic matrix high-temperature wearable sealing coating to coat the ceramic matrix phase, so that the four-phase ceramic matrix high-temperature wearable sealing coating with multi-sealing antioxidant barriers is formed. The ceramic matrix phase is ZrO2 with part of stable Dy2O3, the lubricating phase is h-BN, the pore-forming phase is polyester, and the high-temperature antioxidant nanophase is nano SiO2 or Al2O3 or Cr2O3. The four-phase ceramic matrix high-temperature wearable sealing coating has the advantages that the diffusion of oxygen towards the inside of the coating or a coating / matrix interface can be effectively stopped due to the addition of the high-temperature antioxidant nanophase, so that the high temperature stability and interface integrity of the coating are effectively enhanced, and the thermal shock resistance of the wearable sealing coating at high temperature is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of sealing coating materials, in particular to a four-phase ceramic-based high-temperature abradable sealing coating. Background technique [0002] The rapid development of the aviation industry has put forward higher and higher requirements for aero-engines. High thrust, high efficiency and low fuel consumption have become the general goals of engine design and manufacture. However, during the manufacture and operation of the engine, due to factors such as thermal expansion of the engine components, thermal deformation of the shaft, and blade elongation caused by high-speed rotating centrifugal force, the radial clearance cannot be controlled to zero, and a clearance of 2 to 3 mm must always be reserved. , and an excessively large gap will inevitably cause a large amount of gas leakage, resulting in reduced engine efficiency. Therefore, the abradable sealing coating technology used to reduce the gap betwee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10F01D5/28C23C4/134
CPCY02T50/60
Inventor 高俊国汤智慧王长亮郭孟秋崔永静
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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