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High-temperature abradable seal coating

A sealing coating and high temperature technology, applied in coatings, metal material coating process, layered products, etc., can solve the problems of coating abradability defects, less research on sealing coatings, etc., and achieve good chemical stability Sex and thermal shock resistance, slow down the oxidation rate, improve the effect of thermal shock resistance

Inactive Publication Date: 2010-02-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high-temperature sealing coatings studied in the past are mostly based on micron ZrO 2 As the base phase, nano-ZrO 2 There are few studies on the sealing coating as the base phase
Domestically, the micron ZrO has been developed 2 High-temperature sealing coating as the base phase, but the abradability of the coating still has obvious defects under long-term service conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1. Preparation of a high-temperature abradable sealing coating with a single-layer structure:

[0019] Use compressed air to spray hard brown corundum abrasive at high speed to the surface of the substrate to be sprayed to roughen the surface.

[0020] 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 0.1 mm.

[0021] Spray "85wt.% nanometer Y-PSZ+15wt.% nanometer α-Al on the bonded bottom layer by plasma spraying process 2 o 3 "Composite agglomerated powder to prepare an oxygen barrier layer with a thickness of 0.30mm.

[0022] Spray "78wt.% nanometer Y-PSZ+15wt.% nanometer α-Al on the oxygen barrier layer by plasma spraying process 2 o 3 +2wt.% hBN+5wt.% polyphenylene"nano-Y-PSZ-based high-temperature sealing coating material to prepare the sealing surface layer with a thickness of 2.0mm.

Embodiment 2

[0023] Example 2. Preparation of a high-temperature abradable sealing coating with a single-layer structure:

[0024] Use compressed air to spray hard brown corundum abrasive at high speed to the surface of the substrate to be sprayed to roughen the surface.

[0025] 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 0.1 mm.

[0026] Spray "80wt.% nanometer Y-PSZ + 20wt.% nanometer α-Al on the bonding bottom layer by plasma spraying process 2 o 3 "Composite agglomerated powder to prepare an oxygen barrier layer with a thickness of 0.30mm.

[0027] Spray "83wt.% nanometer Y-PSZ+10wt.% nanometer α-Al on the oxygen barrier layer by plasma spraying process 2 o 3 +2wt.% hBN+5wt.% polyphenylene"nano-Y-PSZ-based high-temperature sealing coating material to prepare the sealing surface layer with a thickness of 2.0mm.

Embodiment 3

[0028] Example 3. Preparation of high-temperature abradable sealing coating with single-layer structure:

[0029] Use compressed air to spray hard brown corundum abrasive at high speed to the surface of the substrate to be sprayed to roughen the surface.

[0030] 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 0.15 mm.

[0031] Spray "80wt.% nanometer Y-PSZ + 20wt.% nanometer α-Al on the bonding bottom layer by plasma spraying process 2 o 3 "Compound agglomerated powder to prepare an oxygen barrier layer with a thickness of 0.5mm.

[0032] Spray "88wt.% nanometer Y-PSZ+5wt.% nanometer α-Al on the oxygen barrier layer by plasma spraying process 2 o 3 +2wt.% hBN+5wt.% polyphenylene"nano-Y-PSZ-based high-temperature sealing coating material to prepare the sealing surface layer with a thickness of 2.0mm.

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Abstract

The invention relates to high-temperature abradable seal coating with single-layer or multi-layer structure, wherein the high-temperature abradable seal coating with single-layer structure is providedwith a bonding bottom layer sprayed on a base body, and an oxygen barrier layer and a seal surface layer are sequentially sprayed on the bonding bottom layer; on the basis of the high-temperature abradable seal coating with single-layer structure, at least another seal surface layer is needed to be sprayed on the seal surface layer to form the high-temperature abradable seal coating with multi-layer structure; the bonding bottom layer is made of NiCrAlY or NiCoCrAlY alloy powder, the oxygen barrier layer is made of composite agglomerated powder of nano yttria, partially stable zirconia and nano Alpha-Al2O3, and the seal surface layer is made of nano Y-PSZ based high-temperature seal coating materials. The high-temperature abradable seal coating has better high temperature stability, thermal shock resistance and abradability during the use.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a high-temperature abradable sealing coating with a single-layer or multi-layer structure. Background technique [0002] At present, there are more than 20 kinds of abradable sealing coatings suitable for engine sealing at home and abroad. Among them: there are low-temperature abradable sealing coatings represented by AlSi-polyester, AlSi-graphite, Ni-graphite, etc., and their service temperature is generally below 500 °C. There are medium-temperature abradable sealing coatings represented by Ni-diatomaceous earth, NiCrAl-bentonite, NiCrAl-hBN, etc., and their service temperature is generally below 900 °C. With the increase of the temperature of the compressed air of the turbine, the use temperature of the sealing coating used for the turbine part has reached 1000-1350 °C, and the thermal shock resistance, erosion resistance and chemical stability of the sealing coating have been raised....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00C23C24/00C23C4/08C23C4/10
Inventor 程旭东肖巍闵捷孟令娟张琦叶菲王珂李光磊
Owner WUHAN UNIV OF TECH
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