Nano columnar crystal thermal barrier coating layer and preparation method thereof

A technology of thermal barrier coatings and columnar crystals, applied in coatings, chemical instruments and methods, metal material coating processes, etc., can solve the problems of complex preparation processes and high raw material costs of precursor particles, and achieve simple preparation processes and low cost. The effect of low cost and wide source of raw materials

Inactive Publication Date: 2013-03-13
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] One of the purposes of the present invention is to provide a nano-columnar crystal thermal barrier coating in order to solve the above-mentioned problems such as the high cost of the raw materials of the spraying

Method used

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  • Nano columnar crystal thermal barrier coating layer and preparation method thereof
  • Nano columnar crystal thermal barrier coating layer and preparation method thereof
  • Nano columnar crystal thermal barrier coating layer and preparation method thereof

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Embodiment 1

[0034] A nano-columnar crystal thermal barrier coating, which is a double-layer structure, including a bonding layer with an average thickness of 140 microns and a ceramic layer with an average thickness of 220 microns;

[0035] The bonding layer is obtained by spraying NiCrCoAlY powder by means of atmospheric plasma spraying;

[0036] In the NiCrCoAlY powder, calculated by mass percentage, Cr+Al:Ni+Co:Y is 22.81:75.88:1.31;

[0037] The ceramic layer is obtained by mixing zirconia powder and alumina powder stabilized with yttrium oxide at a mass ratio of 15.7:1, and then rolling and vibrating milling under the protection of argon to obtain a composite powder with atmospheric plasma. The method of spraying is obtained after spraying on the bonding layer;

[0038] The particle size of the yttrium oxide partially stabilized zirconia powder is 45-75 microns, and the particle size of the alumina powder is 2-10 microns.

[0039] The above-mentioned preparation method of a nano co...

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Abstract

The invention discloses a nano columnar crystal thermal barrier coating layer and a preparation method thereof. The nano columnar crystal thermal barrier coating layer has a double-layer structure and comprises an adhesive layer and a ceramic layer; the adhesive layer is formed by spraying a NiCrCoAlY powder body by an atmosphere plasma spraying method; and the ceramic layer is formed by uniformly mixing stable zirconium oxide powder and aluminum oxide powder of an yttrium oxide part according to the mass ratio of 10-20:1, grinding the mixture by a rolling vibration grinder under the condition of argon protection to obtain a compound powder body, and spraying the compound powder body to the adhesive layer by the atmosphere plasma spraying method. The nano columnar crystal thermal barrier coating layer with the double-layer structure is low in raw material cost; the elastic modulus of the coating layer is relatively large; the porosity is relatively high; the preparation process is simple; and the nano columnar crystal thermal barrier coating layer is convenient to operate and is suitable for industrial production.

Description

technical field [0001] The invention relates to a nano columnar crystal thermal barrier coating and a preparation method thereof. Background technique [0002] Yttria partially stabilized zirconia is the best choice for thermal barrier coating due to its low thermal conductivity and similar thermal expansion coefficient to the superalloy substrate, and has been successfully applied to turbine blades and combustors of gas engines. At present, the research on thermal barrier coatings mainly focuses on the thermal stress and thermal growth oxide film (TGO) caused by the mismatch of thermal expansion coefficient between the ceramic layer and the substrate. For this reason, many scholars improve the microstructure and structure of the coating by changing the spraying process parameters, and some scholars improve the coating microstructure and structure by adding a small amount of Al 2 o 3 And the use of nanoscale YSZ powder to modify the coating was studied. However, there are...

Claims

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Application Information

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IPC IPC(8): B32B15/04B32B9/04C23C4/08C23C4/10C23C4/12C23C4/073C23C4/11C23C4/134
Inventor 唐宏志赵立峰张永刚
Owner UNIV OF SHANGHAI FOR SCI & TECH
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