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Thermal barrier coating with structure gradient and preparation method thereof

A technology of structural gradient and thermal barrier coating, applied in coating, metal material coating process, melt spraying and other directions, can solve the problem of coarse columnar crystals, large columnar crystal gaps and defects, thermal corrosion resistance and erosion resistance. There is no major improvement and other problems, and the effect of strong corrosion resistance and strong erosion resistance is achieved.

Active Publication Date: 2018-07-31
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the columnar crystals of this structure are coarse, and there are many gaps and defects in the columnar crystals, so that the thermal corrosion resistance and erosion resistance are not greatly improved.

Method used

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  • Thermal barrier coating with structure gradient and preparation method thereof

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specific Embodiment approach

[0015] The preferred embodiment of the structurally gradient multilayer thermal barrier coating of the present invention is:

[0016] It includes a substrate, an adhesive layer, and a ceramic surface layer arranged in sequence from bottom to top, and the microstructure of the ceramic surface layer changes in a gradient, and a quasi-columnar structure ceramic bottom layer, a layered and columnar mixed structure ceramic transition layer are arranged in sequence from bottom to top and a dense layered ceramic top layer.

[0017] The bonding layer material is NiCoCrAlY or NiCoCrAlYX, X is one or more of Hf, Ta, Si, the ceramic surface layer material is YSZ or GYb-YSZ, and YSZ is ZrO 2 +(6~8wt%)Y 2 o 3 , GYb-YSZ is 5 ~ 10mol% Gd 2 o 3 and Yb 2 o 3 Co-doped YSZ.

[0018] The thickness of the quasi-columnar structure ceramic bottom layer is 60 μm-120 μm, the thickness of the layered and columnar mixed structure ceramic transition layer is 30 μm-50 μm, and the thickness of the d...

specific Embodiment

[0034] Specific examples, such as figure 1 Shown:

[0035] The first step is to prepare the superalloy substrate, which is pretreated by sandblasting;

[0036] The second step is to prepare a NiCoCrAlY bonding layer on the substrate.

[0037] (A) The NiCoCrAlY bonding layer was prepared by low-pressure plasma spraying method. The main process parameters are: spraying power 64KW, vacuum chamber pressure 35mbar, powder feeding rate 80g / min, spraying distance 350mm, main gas flow Ar gas 110L / min, H 2 The air flow rate is 6L / min;

[0038] (B) The NiCoCrAlY bonding layer was prepared by supersonic flame spraying method. The main process parameters are: kerosene 25L / h, oxygen 900L / min, combustion chamber pressure 8.4bar, powder feeding rate 80g / min, spraying distance 350mm.

[0039] Grind the prepared bonding layer on 200#, 400#, 600#, 800# sandpaper in turn, and set aside. If other material bonding layer is prepared, such as NiCoCrAlYX (X: one or more of Hf, Ta, Si), the spra...

Embodiment 1

[0056] Example 1: Low-pressure plasma spraying NiCoCrAlYTa bonding layer + ultra-low-pressure plasma physical heterogeneous deposition of YSZ structurally graded ceramic layer on a superalloy substrate

[0057] The first step is to prepare the superalloy substrate, which is pretreated by sandblasting;

[0058] In the second step, the NiCoCrAlYTa bonding layer was prepared by low pressure plasma spraying method. The main process parameters are: spraying power 64KW, vacuum chamber pressure 35mbar, powder feeding rate 80g / min, spraying distance 350mm, main air flow Ar gas 110L / min, H 2 Air flow is 6L / min. Sand the prepared adhesive layer on 200#, 400#, 600#, and 800# sandpaper in turn, and set aside.

[0059] The third step is to deposit a YSZ structural gradient ceramic surface layer on the bonding layer, using the method of ultra-low pressure plasma physical heterogeneous deposition. The powder used is ultra-fine particle size YSZ nano-agglomerated powder, and the particle s...

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Abstract

The invention discloses a thermal barrier coating with structure gradient and a preparation method thereof. The thermal barrier coating comprises a base body, a bonding layer and a ceramic surface layer which are sequentially arranged from bottom to top, wherein the microstructure of the ceramic surface layer is in gradient change, and is sequentially equipped with a ceramic bottom layer of a quasi-cylindrical structure, a ceramic transition layer of a layered and cylindrical mixed structure, and a ceramic top layer of a compact layered structure from bottom to top. Disposable continuous preparation for the thermal barrier coating can be realized through an ultralow-pressure plasma multi-phase deposition method. The prepared thermal barrier coating has performance advantages of being highin heat insulation, long in service life, stronger in corrosion resistance, resistant to scouring, and the like.

Description

technical field [0001] The invention relates to a technology for preparing a thermal barrier coating by using an ultra-low pressure plasma physical multiphase deposition method, in particular to a thermal barrier coating with a structural gradient and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) technology is usually a thermal protection technology that combines high temperature resistant, low thermal conductivity, and corrosion resistant ceramic materials with metal substrates in the form of coatings to reduce the temperature of metal surfaces in high temperature environments. . At present, thermal barrier coating technology has become the three key technologies of aero-engine high-pressure turbine blades alongside high-temperature structural material technology and high-efficiency film cooling technology. [0003] At present, a typical thermal barrier coating is mainly composed of two layers: the middle layer is a metal bondi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/11C23C4/073
CPCC23C4/073C23C4/11C23C4/134
Inventor 于月光侯伟骜高丽华冀晓鹃彭浩然孙建刚张春鸣
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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