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Thermal barrier coating with controllable porosity and pore morphology and preparation method of thermal barrier coating

A thermal barrier coating, porosity technology, applied in the field of materials, can solve the problems of uncontrollable pore morphology in the coating, small adjustment range, low elastic modulus, etc., to improve service stability, simple and convenient operation, and improve The effect of service performance

Active Publication Date: 2017-02-22
咸阳瞪羚谷新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional thermal spraying thermal barrier coatings usually achieve different porosity by adjusting the spraying parameters. The porosity of this coating has a small control range, and the morphology of the pores in the coating cannot be controlled.
Usually the flat pores formed between the flat particles significantly reduce the thermal conductivity, because the gap is usually less than 100nm, and when they are served under high temperature conditions above 1000°C, rapid healing occurs, and stable low thermal conductivity and low elasticity cannot be maintained. modulus properties

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preparation example Construction

[0034] The preparation method of the thermal barrier coating with controllable porosity and pore morphology provided by the present invention comprises the following steps:

[0035] Step 1, preparing composite powder of thermal spraying material and pore-forming material by spray drying method, the composite powder is composed of thermal barrier coating material and pore-forming material, the volume fraction of pore-forming material is 5%-50%, and the remaining 50%- 95% are thermal barrier coating materials; the size of the pore-forming material is spherical particles with a diameter of 5-50 μm and / or flat particles with a length of 10-50 μm and a width of 0.3-10 μm.

[0036] Step 2, by thermal spraying method, the composite powder comprising thermal barrier coating material and pore-forming material sprayed is deposited on the substrate, and the pore-forming material containing 5%-50% volume fraction is prepared, and the remaining 50%-95% It is a composite ceramic coating of th...

Embodiment 1

[0041] Step 1, using 8YSZ powder with a particle size of 50-100 nm as the thermal barrier coating material, spherical graphite with a particle size of 5 μm-50 μm or flat graphite with a length of 10-50 μm and a width of 0.3-10 μm as a pore-forming material, wherein The volume fraction of graphite is 30%, the volume fraction of 8YSZ is 70%, and the composite powder with a size of 50-70 μm is prepared by spray drying.

[0042] Step 2: Use IN738 stainless steel as the substrate and composite powder with a particle size of 50-70 μm as the spraying powder, wherein the volume fraction of the pore-forming material in the composite powder is 30%, the volume fraction of 8YSZ is 70%, and the pore-forming material is 5-50 μm Spherical graphite or flat graphite with a length of 10-50 μm and a width of 0.3-10 μm. The composite powder was spray-deposited on the IN738 stainless steel substrate by plasma spraying, and the 8YSZ composite ceramic coating containing graphite with a volume fracti...

Embodiment 2

[0048] Step 1, using LZO powder with a particle size of 50-100 nm as the thermal barrier coating material, spherical graphite with a particle size of 5 μm-50 μm or flat graphite with a length of 10-50 μm and a width of 0.3-10 μm as a pore-forming material, wherein The volume fraction of graphite is 15%, the volume fraction of LZO is 85%, and the composite powder with a size of 50-70 μm is prepared by spray drying.

[0049] Step 2: Use IN738 as the substrate and a composite powder with a particle size of 50-70 μm as the spray powder, wherein the volume fraction of the pore-forming material in the composite powder is 15%, the volume fraction of LZO is 85%, and the pore-forming material is 5-50 μm Spherical graphite or flat graphite with a length of 10-50 μm and a width of 0.3-10 μm. The composite powder was spray-deposited on the IN738 substrate by plasma spraying, and the LZO composite ceramic coating containing graphite with a volume fraction of 15% was obtained. After the gr...

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Abstract

The invention provides a thermal barrier coating with controllable porosity and pore morphology and a preparation method of the thermal barrier coating and belongs to the technical field of materials. Firstly, composite powder containing a thermal barrier coating ceramic material and pore-forming materials in different forms is prepared, a composite coating with the volume fraction of the pore-forming materials being 5%-50% is prepared in a deposition manner through a thermal spraying method, the pore-forming materials are free of deformation in the thermal spraying process, and the original morphology is kept. The pore-forming materials in the composite coating are burnt off in an oxidization manner, and therefore pores same as the pore-forming materials in morphology and position are obtained in the coating. Compared with a traditional thermal barrier coating, the porosity and the pore morphology of the thermal barrier coating prepared through the method are controllable, the pores are free of sintering in the service and use of the coating, and by adjusting the porosity and the pore morphology, the service performance and the service stability of the thermal barrier coating can be substantially improved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a thermal barrier coating with controllable porosity and pore morphology and a preparation method thereof. Background technique [0002] The development of aerospace, energy and power industries has put forward higher requirements for aero-engines and industrial gas turbines, requiring hot-end components to serve for a long time under conditions of high temperature, corrosion, and wear, which directly imposes on the surface properties of gas turbine hot-end components. To meet higher requirements, cooling and heat insulation measures must be adopted to ensure that the turbine blades can work for a long time in a high temperature environment. There are three main cooling technologies commonly used at present: cooling air flow cooling technology inside the turbine blade, film cooling technology and thermal barrier coating technology. The development of thermal barrie...

Claims

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Application Information

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IPC IPC(8): C23C4/11C23C4/134C23C4/18
CPCC23C4/18
Inventor 李长久刘韬杨冠军李成新
Owner 咸阳瞪羚谷新材料科技有限公司