DVC thermal barrier coating and preparation method and application thereof

A thermal barrier coating and bottom layer technology, applied in coatings, metal material coating processes, sustainable transportation, etc., can solve the problems of lateral associated cracks in APSDVCTBCs, reduce long-term high-temperature fatigue oxidation, and improve high-temperature strain tolerance. , The effect of high coating porosity controllable range

Pending Publication Date: 2022-06-07
EAST CHINA UNIV OF SCI & TECH +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problems such as the lateral accompanying cracks of APS DVC TBCs in the above-mentioned prior art, the present invention provides a DVC thermal barrier coating and its preparation method and application

Method used

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  • DVC thermal barrier coating and preparation method and application thereof
  • DVC thermal barrier coating and preparation method and application thereof
  • DVC thermal barrier coating and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0032] Using GH3128 / 3230 superalloy as the matrix, it is processed by wire cutting and polishing. The surface of the disc was sandblasted with 80-mesh white corundum, then fully ultrasonically cleaned with acetone, and dried. A 100 μm thick NiCrAlY or NiCoCrAlY metal bonding layer was prepared by low-pressure plasma spraying on the surface of the treated circular test piece. Then, a YSZ thermal barrier coating with a thickness of 250 μm was prepared on the surface of the adhesive layer by atmospheric plasma spraying. figure 2 shown), the total porosity of the coating is 20%, and the bond strength with the adhesive layer is 35 MPa. The spraying equipment is Oerlikon Metco Triplexpro210 high enthalpy plasma spray gun, the preheating temperature of the superalloy substrate is 380℃, the spraying distance is 75mm, the moving speed of the spray gun is 500mm / s, the working power is 50kW, and the working gas is: Ar45slpm, H 2 -5slpm, YSZ powder used (such as figure 1 shown) is sp...

Embodiment 2

[0036] Using directionally solidified nickel-based superalloy DZ125 as the matrix, it is processed by wire cutting and polishing. The surface of the disc was sandblasted with 120-mesh white corundum, then fully ultrasonically cleaned with acetone, and dried. A NiCoCrAlYHf metal bonding layer with a thickness of 150 μm was prepared by supersonic flame spraying on the surface of the treated circular test piece. Then, a low-porosity and dense YSZ bottom layer with a thickness of 60-150 μm was prepared on the surface of the adhesive layer by atmospheric plasma spraying with a porosity of 3%, and a DVC structure YSZ top layer was prepared on the surface of the layer with a thickness of ~300-1500 μm, vertical Crack density is ~7cracks / mm, see Image 6 , the total porosity of the coating is 10%, and the interface bonding strength with the adhesive layer is 60MPa. The spraying equipment is Oerlikon Metco Triplexpro210 high enthalpy plasma spray gun, in which: (1) the 60-150μm botto...

Embodiment 3

[0039] Using the third generation nickel-based single crystal superalloy DD10 as the base, it is processed by wire cutting and polishing. The surface of the disc was sandblasted with 240-mesh white corundum, and then fully ultrasonically cleaned with acetone and dried. A 200 μm thick NiCoCrAlYTa metal bonding layer was prepared by low-pressure plasma spraying on the surface of the treated circular test piece. Then, a DVC structure YSZ bottom layer with a thickness of 60-500 μm was prepared on the surface of the bonding layer by atmospheric plasma spraying, the vertical crack density was ~1cracks / mm, the total porosity was ~5%, and the associated transverse crack length / vertical crack length was about ~3%. Then, 250-1500μm thick DVC structure YSZ+5.8wt.%Gd was prepared on the surface of this layer 2 O 3 +6.2wt.%Yb 2 O 3 layer or Gd 2 Zr 2 O 7 +20wt.%Yb 2 O 3 layer, the vertical crack density is ~5cracks / mm, the associated transverse crack length / vertical crack length...

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Abstract

The invention relates to a preparation method of a DVC thermal barrier coating, which comprises the following steps: providing powder, the chemical components of which are YSZ or YSZ + xGd2O3 + yYb2O3 or Gd2Zr2O7 + zYb2O3 or LaMgAl11O19 or La2 (Zr0. 7Ce0. 3) 2O7, x + y is less than or equal to 12wt%, z is less than or equal to 20wt%; the powder forms the DVC thermal barrier coating through high-heat-enthalpy atmosphere plasma spraying. The invention further provides the DVC thermal barrier coating obtained through the preparation method. The invention further provides application of the DVC thermal barrier coating. The DVC thermal barrier coating is used for a high-temperature hot end component of an aero-engine or a gas turbine. The chemical components of the DVC thermal barrier coating are YSZ or YSZ + xGd2O3 + yYb2O3 or Gd2Zr2O7 + zYb2O3 or LaMgAl11O19 or La2 (Zr0. 7Ce0. 3) 2O7, the applicable material range is wide, the strain tolerance can be increased, the working temperature can be increased, the erosion and erosion resistance can be improved, and the thermal shock resistance cycle life can be prolonged.

Description

technical field [0001] The invention relates to a thermal barrier coating on the surfaces of high-temperature hot end parts of aero-engines and gas turbines (both engines), and more particularly to a DVC thermal barrier coating and a preparation method and application thereof. Background technique [0002] High-performance thermal barrier coating (TBC) is one of the key technologies to continuously increase the turbine inlet temperature and develop a new generation of aero-engines and gas turbines. TBC uses oxide ceramics with high melting point, low thermal conductivity, high hardness and corrosion resistance to protect the metal substrate, prolong the service life of metal hot-end components, reduce fuel consumption and polluting gas emissions, thereby improving the thrust-to-weight ratio and thermal efficiency of the "two machines" and overall performance. TBCs are widely used in turbine blades, combustion chambers, heat shields, fuel nozzles, flame tubes, and tailpipes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11
CPCC23C4/134C23C4/11Y02T50/60
Inventor 张显程陈小龙龙东辉束国刚石俊秒孙健王卫泽刘伟余志勇赵晓峰涂善东王大力
Owner EAST CHINA UNIV OF SCI & TECH
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