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Thermal barrier coating capable of resisting CMAS molten settling erosion and preparing method of coating

A technology of thermal barrier coatings and deposits, which is applied in coatings, fusion spraying, metal material coating processes, etc., can solve problems such as premature failure of thermal barrier coatings, achieve good interface matching, and low manufacturing costs Effect

Inactive Publication Date: 2016-11-23
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main purpose of the present invention is to provide a thermal barrier coating resistant to erosion of CMAS molten deposits and its preparation method, to overcome the problem of premature failure of thermal barrier coatings in the prior art in the environment where CMAS molten deposits exist

Method used

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  • Thermal barrier coating capable of resisting CMAS molten settling erosion and preparing method of coating
  • Thermal barrier coating capable of resisting CMAS molten settling erosion and preparing method of coating
  • Thermal barrier coating capable of resisting CMAS molten settling erosion and preparing method of coating

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preparation example Construction

[0034] The present invention adopts ordinary atmospheric plasma spraying (using 9MB type plasma spraying gun) or high-energy plasma spraying to prepare 18YSZ / 8YSZ or 48YSZ / 8YSZ coatings, and the ceramic top layer has good high-temperature heat insulation performance and high-temperature stability, and at the same time, the ceramic top layer has Excellent protection against molten CMAS deposits, the coating prepared by this method matches well with the metal substrate, the bonding strength of the coating is 25-40MPa, and the porosity of the ceramic top layer is less than 10%. The preparation method of the coating includes:

[0035] Step 1: Dry the 8YSZ powder and 18YSZ or 48YSZ powder for the preparation of the ceramic layer, and the MCrAlY (M is Ni or NiCo) powder for the preparation of the bonding layer in an oven at 100±10°C for 60 to 120 minutes.

[0036] Step 2: Pre-treatment of the sprayed sample. Clean the sample to be sprayed with acetone to remove the oil on the surface...

Embodiment 1

[0044] Step 1: Take NiCrAlY (Ni22Cr6Al1Y, wherein the mass fraction of Cr is 22%, the mass fraction of Al is 6%, the mass fraction of Y is 1%, and the rest is Ni) bonding layer powder, 8YSZ powder, 48YSZ powder, and spray Dry in an oven at 90°C for 60 minutes.

[0045] Step 2: Pre-treatment of the sprayed sample, clean the sample to be sprayed with acetone, remove the oil on the surface of the sample, and use 20 mesh corundum sand for sandblasting treatment. The sandblasting process conditions are pressure 0.1MPa, sandblasting distance 60mm, spraying The sanding angle is 80°. After sandblasting, use a high-pressure air gun to blow air at a pressure of 0.3 MPa to remove residual sand grains on the surface of the sample.

[0046] Step 3: Preparation of the metal bonding layer, using supersonic flame spraying equipment, with a barrel length of 100mm, spraying the NiCrAlY bonding layer, the spraying process is oxygen flow rate 38L / h, kerosene flow rate 18L / h, powder feeding amount...

Embodiment 2

[0051] Step 1: Take NiCrAlY (Ni25Cr8Al0.8Y, wherein the mass fraction of Cr is 25%, the mass fraction of Al is 8%, the mass fraction of Y is 0.8%, and the rest is Ni) bonding layer powder, 8YSZ powder, and 18YSZ powder , Use an oven to dry at 110°C for 120 minutes before spraying.

[0052] Step 2: Pre-treatment of the sprayed sample, clean the sample to be sprayed with acetone, remove the oil on the surface of the sample, and use 60 mesh corundum sand for sandblasting treatment. The sandblasting process conditions are pressure 0.3MPa, sandblasting distance 80mm, spraying The sanding angle is 70°. After sandblasting, use a high-pressure air gun to blow air at a pressure of 0.5 MPa to remove residual sand grains on the surface of the sample.

[0053] Step 3: Preparation of metal bonding layer, using supersonic flame spraying equipment, with a barrel length of 100mm, spraying NiCrAlY bonding layer, the spraying process is oxygen flow rate 40L / h, kerosene flow rate 22L / h, powder f...

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Abstract

The invention discloses a thermal barrier coating capable of resisting CMAS molten settling erosion and a preparing method of the coating. The coating comprises a bonding layer composed of MCrAlY, a ceramic bottom layer composed of 8YSZ, and a ceramic top layer composed of 18YSZ or 48YSZ, the total thickness of the thermal barrier coating is smaller than 500 micrometers, and the thickness ratio of the ceramic top layer to the ceramic bottom layer is 1:1-0.05:1; the preparing method comprises the steps that MCrAlY powder used for preparing the bonding layer, and 8YSZ powder and 18YSZ or 48YSZ powder for preparing the ceramic layers are dried in an oven; secondly, treatment before sample spraying is carried out; thirdly, the bonding layer is prepared; fourthly, the 8YSZ ceramic bottom layer is sprayed; fifthly, the 18YSZ or 48YSZ ceramic top layer is sprayed on the surface of the 8YSZ ceramic bottom layer. The heat insulation performance and the high-temperature stability, relative to 8YSZ, of the ceramic top layer with the high Y content are obviously improved, and more importantly, the thermal barrier coating has the excellent molten CMAS settling resisting protection capacity.

Description

technical field [0001] The invention relates to a thermal barrier coating and a preparation method thereof, in particular to a thermal barrier coating resistant to corrosion by molten deposits and a preparation method thereof. Background technique [0002] Thermal barrier coating TBCs (Thermal barrier coatings) technology is an indispensable key technology in high-performance gas turbine engines, and it is an effective means to increase the service temperature of hot-end parts of gas turbines and prolong their service life. The traditional YSZ thermal barrier coating usually refers to 8YSZ (that is, 6~8wt% Y 2 o 3 Partially stabilized ZrO 2 ) thermal barrier coatings have obtained a large number of practical applications at home and abroad. However, as the operating temperature of gas turbine hot-end components continues to increase and the working conditions become more severe during use, traditional thermal barrier coatings can no longer meet the requirements for Requir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/073C23C4/11C23C4/129C23C4/134
Inventor 何箐邹晗王伟平
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI