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A nano/columnar-like mixed structure thermal barrier coating and its preparation method

A Thermal Barrier Coating, Hybrid Structure Technology

Active Publication Date: 2015-11-25
CHINESE ACAD OF AGRI MECHANIZATION SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] There are more reports and applications of micron powder sprayed columnar crystal structure coatings in the world, such as the U.S. Patent No. "US5558992" and the technology disclosed in the European Patent No. "EP1281788A1", but they all use denser or Surface melted smelting crushing, sintering crushing, HOSP (agglomerated into hollow powder and then plasma spheroidized) powder to prepare the coating, although it is easier to obtain a vertical crack structure similar to columnar crystals, but the thermal insulation performance of the coating is relatively reduced (thermal Conductivity 1.2~1.6W / m K), and there are many transverse cracks around the columnar crystals (cracks between layers parallel to the direction of the matrix)
The preparation method disclosed in the Chinese invention patent application with the application number "200910237548" and the title "multi-element rare earth oxide-doped zirconia thermal barrier coating with network crack structure and its preparation method" uses multi-element rare earth oxide The proportion of transverse cracks in the coating prepared by modified powder (solid-phase synthesized micron powder before agglomeration) is 10-50%, which will lead to cracks along the transverse cracks in the coating during service, and cannot make full use of the advantages of the columnar crystal structure , which affects the further improvement of the reliability and service life of the coating; at the same time, there are certain requirements for the thickness of some columnar crystal structure coatings in the application process, which usually needs to reach more than 0.5mm

Method used

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  • A nano/columnar-like mixed structure thermal barrier coating and its preparation method
  • A nano/columnar-like mixed structure thermal barrier coating and its preparation method
  • A nano/columnar-like mixed structure thermal barrier coating and its preparation method

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preparation example Construction

[0062] see figure 2 , figure 2 It is a flow chart of the method of the present invention. The preparation method of the hybrid structure thermal barrier coating of the present invention comprises the following steps:

[0063] Powder selection and pretreatment step a, select nano-agglomerated YSZ spray powder and perform high-temperature sintering or plasma densification treatment; preferably, the nano-agglomerated YSZ spray powder contains 6-8 wt% Y 2 o 3 Partially stabilized ZrO 2 , and the fluidity of the nano-agglomerated YSZ spray powder is less than 60s / 50g, and the bulk density is greater than 1.6g / cm 3 .

[0064] In the substrate pretreatment step b, the substrate 1 is provided and the substrate 1 is cleaned and sandblasted; the substrate 1 is preferably a high-temperature alloy or heat-resistant steel.

[0065] Prepare the metal bonding layer step c, the metal alloy powder is prepared by plasma spraying or supersonic flame spraying to prepare the metal bonding ...

Embodiment 1

[0085] Example 1: Preparation of coating on the surface of DZ40M superalloy substrate 1

[0086] Step a: Powder selection and preparation

[0087] Select nanometer YSZ agglomerated powder, after powder agglomeration, undergo plasma densification treatment, the particle size range of the sprayed powder is -90μm~+37μm, and the bulk density is 1.74g / cm 3 , the fluidity is 52s / 50g, the powder is used for plasma spraying after drying at 100°C for 2 hours.

[0088] Step b: Substrate 1 pretreatment

[0089] Choose a cobalt-based superalloy, the grade is DZ40M, soak the superalloy substrate 1 in acetone, take it out and dry it after 1 hour; Compressed air blows off residual sand particles on the surface.

[0090] Step c: Preparation of metal bonding layer 2 by supersonic flame spraying

[0091] The preparation of the bonding layer is mainly NiCrAlY metal alloy powder, the particle size range of the powder is -45μm ~ +15μm, according to the preparation process parameters of the met...

Embodiment 2

[0095] Embodiment 2: prepare coating on MGH754Ni-Cr alloy substrate surface

[0096] Step a: Powder selection and preparation

[0097] Select nanometer YSZ agglomerated powder, after powder agglomeration, undergo plasma densification treatment, the particle size range of the sprayed powder is -61μm~+38μm, and the bulk density is 1.85g / cm 3 , the fluidity is 47s / 50g, the powder is used for plasma spraying after drying at 100°C for 2 hours.

[0098] Step b: Substrate 1 pretreatment

[0099] Select the dispersion strengthened NiCr heat-resistant alloy, the grade is MGH754, soak the superalloy substrate 1 in acetone, take it out and dry it after 1 hour; 1 Use compressed air to blow off the residual sand particles on the surface.

[0100] Step c: Preparation of metal bonding layer 2 by plasma spraying

[0101] For the preparation of the bonding layer, the metal alloy powder whose main component is NiCoCrAlY is selected, and the particle size range of the powder is -75μm~+45μm. ...

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Abstract

The invention relates to a nanometer / columnar-like crystal mixing structure thermal barrier coating and a preparation method thereof. The mixing structure thermal barrier coating is a nanometer / columnar-like crystal mixing structure coating, and comprises a substrate, a metal bonding layer and a ceramic layer, wherein the metal bonding layer and the ceramic layer are sequentially coated on the substrate, the ceramic layer comprises unmelted nanoparticles, nanometer pores, nanometer crystal and ultrafine crystal, and has cracks perpendicular to the substrate, and the cracks form the columnar-like crystal structure. The mixing structure thermal barrier coating preparation method comprises powder selection, a pretreatment step, a substrate pretreatment step, a metal bonding layer preparation step, and a 6-8% YSZ ceramic layer preparation step. The coating disclosed by the present invention has characteristics of high strain tolerance, excellent thermal insulation performance, high bonding strength, high thermal cycle life, and high thermal shock life, such that the thermal barrier coating has a good comprehensive performance.

Description

technical field [0001] The present invention relates to a method for preparing a novel hybrid structure thermal barrier coating, in particular to a method of spraying nanometer YSZ powder using a conventional plasma spraying process to prepare a nano / columnar crystal mixed structure thermal barrier coating with higher strain tolerance and good comprehensive performance. barrier coating method. Background technique [0002] Thermal Barrier Coating (TBC) is a high-temperature structural material surface protection technology that uses the excellent high-temperature resistance, heat insulation, and corrosion resistance of ceramic materials to combine ceramics and metal substrates in the form of coatings. It is composed of a ceramic surface layer with high conductivity and a metal bonding layer with good thermal expansion coefficient matching with the metal substrate and ceramic surface layer. The use of thermal barrier coatings will significantly increase the operating tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B15/04B32B18/00B32B7/12C23C4/12C23C4/08C23C4/10C23C4/073C23C4/11C23C4/134
Inventor 何箐汪瑞军袁涛王世兴
Owner CHINESE ACAD OF AGRI MECHANIZATION SCI
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