Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of ceramic sealing coating with high thermal shock resistance

A technology of thermal shock resistance and ceramic seal, which is applied in the field of aerospace, can solve the problems of easy falling off blocks, poor thermal shock resistance, etc., and achieve the effect of improving the bonding state, improving thermal shock resistance, and mature technology

Active Publication Date: 2015-03-25
BEIJING GENERAL RES INST OF MINING & METALLURGY +1
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the difference in thermal expansion coefficient between ceramic materials and metal substrates such as superalloys, ceramic sealing coatings have problems such as poor thermal shock resistance and easy to fall off during application.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The preparation method of high thermal shock resistance ceramic sealing coating comprises the following steps:

[0015] Step 1: Clean the superalloy substrate and roughen it by sand blowing;

[0016] Step 2: adopt low-pressure plasma (LPPS) on the surface of the superalloy to prepare the MCrAlY bonding bottom layer, and the coating thickness is 100-200 μm;

[0017] Step 3: On the surface of the MCrAlY bonded bottom layer, use LPPS-TF technology to prepare a yttria partially stabilized zirconia (YSZ) ceramic film layer with a film thickness of 5-10 μm;

[0018] Step 4: Prepare YSZ abradable ceramic surface layer on the surface of YSZ film layer by atmospheric plasma (APS) process, and the coating thickness is 1.5-2 mm;

[0019] Step 5: Carry out vacuum heat treatment on the coating in a vacuum furnace, the heat treatment temperature is 1100° C., and the heat treatment time is 4 hours.

Embodiment 2

[0021] The preparation method of high thermal shock resistance ceramic sealing coating comprises the following steps:

[0022] Step 1: Clean the superalloy substrate and roughen it by sand blowing;

[0023] Step 2: adopt low-pressure plasma (LPPS) on the surface of the superalloy to prepare the MCrAlY bonding bottom layer, and the coating thickness is 100-200 μm;

[0024] Step 3: On the surface of the MCrAlY bonded bottom layer, a yttria partially stabilized zirconia (YSZ) ceramic film layer is prepared by CVD chemical vapor deposition technology, and the film thickness is 20-50 μm;

[0025] Step 4: Prepare YSZ abradable ceramic surface layer on the surface of YSZ film layer by atmospheric plasma (APS) process, and the coating thickness is 1.5-2 mm;

[0026] Step 5: Carry out vacuum heat treatment on the coating in a vacuum furnace, the heat treatment temperature is 1200° C., and the heat treatment time is 2 hours.

Embodiment 3

[0028] The preparation method of high thermal shock resistance ceramic sealing coating comprises the following steps:

[0029] Step 1: Clean the superalloy substrate and roughen it by sand blowing;

[0030] Step 2: adopt low-pressure plasma (LPPS) on the surface of the superalloy to prepare the MCrAlY bonding bottom layer, and the coating thickness is 100-200 μm;

[0031] Step 3: On the surface of the MCrAlY bonded bottom layer, PVD physical vapor deposition is used to prepare a yttria partially stabilized zirconia (YSZ) ceramic film layer with a film thickness of 50-100 μm;

[0032] Step 4: Prepare YSZ abradable ceramic surface layer on the surface of YSZ film layer by atmospheric plasma (APS) process, and the coating thickness is 1.5-2 mm;

[0033] Step 5: Carry out vacuum heat treatment on the coating in a vacuum furnace, the heat treatment temperature is 800° C., and the heat treatment time is 6 hours.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a ceramic sealing coating with high thermal shock resistance. According to the preparation method, the structure of a conventional ceramic sealing coating is improved, a layer of compact continuous ceramic thin film is prepared between a ceramic surface layer and an MCrAlY bonding bottom layer to ensure that the ceramic thin film is in defect-free combination with the MCrAlY bonding bottom layer, and a good base surface is provided for deposition of the ceramic surface layer, so that an interface bonding state of a ceramic layer and a metal layer can be improved, and the thermal shock resistance of the coating can be improved. A preparation process of the ceramic thin film can be selected from compact thin film preparation technologies such as a super-low-pressure plasma-thin film (LPPS-TF) technology or CVD, the thickness of the thin film is 10 nanometers to 200 microns, components of the thin film can be various oxide ceramics, or can be the same as or similar to the components of the surface layer, and tissue structures of the thin film can be uniform or gradient.

Description

technical field [0001] The invention relates to a preparation method of a highly thermal-shock-resistant abradable ceramic sealing coating used for sealing the gas path of an aeroengine, and belongs to the technical field of aerospace. Background technique [0002] Abradable seal coatings reduce the gap between the engine rotor and stator, reducing fuel consumption, improving engine efficiency and operating safety. The ceramic-based abradable sealing coating has the advantages of high temperature resistance, corrosion resistance and heat insulation. It is applied in the outer ring of medium and high pressure turbines of aero-engines and ground gas turbines. The application temperature is as high as 1200 ° C, which is the highest application temperature at present. Class abradable sealing coating. However, due to the difference in thermal expansion coefficient between ceramic materials and metal substrates such as superalloys, ceramic sealing coatings have problems such as p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23C28/00C23C4/12C23C4/06C23C14/00C23C16/00C23C4/073C23C4/10C23C4/11C23C4/134
CPCC23C4/06C23C4/12C23C14/00C23C16/00C23C28/3215Y02T50/60
Inventor 于月光章德铭刘建明沈婕侯伟骜彭浩然鲁秋源
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com