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Preparation method of compact and thick thermal barrier coating

A thermal barrier coating, dense technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the uncertainty of crack growth direction, low bonding strength, coating bonding strength and low service life, etc. problems, to achieve the effect of improving high temperature service stability, improving service temperature and toughness, and uniform and controllable pore size

Pending Publication Date: 2022-04-29
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

In the process of coating preparation, due to the large particle size and uneven distribution of the powder, there are a large number of connected pore defects inside the coating, and the bonding strength and service life of the coating are low.
And the Fe in the coating 2 o 3 , SiO 2 、Al 2 o 3 , CaO and other impurities cause the coating to be prone to phase change and sintering problems when it works for a long time under the service condition above 1100 °C, resulting in cracking and failure of the coating
In addition, due to the low energy density of the conventional plasma spraying process, the powder cannot be completely melted to form a dense coating. The pore size of the prepared ceramic thermal barrier coating is difficult to control, the coating contains slag and raw powder, and the direction of crack growth is uncertain. low intensity

Method used

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  • Preparation method of compact and thick thermal barrier coating
  • Preparation method of compact and thick thermal barrier coating
  • Preparation method of compact and thick thermal barrier coating

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preparation example Construction

[0028] The invention provides a method for preparing a dense and thick thermal barrier coating, comprising:

[0029] S1 obtains ceramic powder prepared from nano raw material as raw material powder.

[0030] In this embodiment, nanostructured ceramic powder is used as the raw material powder of the dense and thick thermal barrier ceramic coating, wherein the purity of the ceramic powder used is ≥99.5%, and the impurity content is ≤0.5%, preferably, the purity of the ceramic powder is ≥99.9%. , impurity content ≤ 0.1%. The primary particle size of the ceramic powder used is 1-100 nm, preferably, the particle size is 5-60 nm.

[0031] In this embodiment, the composition of the ceramic powder includes one or more of zirconia, yttrium oxide, dysprosium oxide, ytterbium oxide, gadolinium oxide, lanthanum oxide, cerium oxide, and magnesium oxide.

[0032] S2 granulating the ceramic powder, and plasma sintering the granulated ceramic powder to obtain a coating raw material.

[003...

Embodiment 1

[0043] In step S1, high-purity yttria-doped stabilized zirconia powder is used as the raw material powder of the dense thermal barrier coating. Wherein, the purity of the ceramic powder is ≥99.9%, and the primary particle size of the ceramic powder is 15-53 nm.

[0044] Step S2, granulating the coating material powder to obtain the original powder and then performing plasma sintering.

[0045]In step S3, the ceramic powder is graded according to a specific particle size ratio, and fully and evenly mixed to obtain a ceramic thermal barrier coating powder raw material with unimodal particle size distribution characteristics. Among them, the peak value of the medium particle size is 5-38 μm, which accounts for 80 wt%, and the fine powder and coarse powder account for 20 wt%.

[0046] Step S4, using the powder obtained in step S3 as the raw material, by adjusting the spraying distance, spraying power, powder feeding amount, etc., the deposition pressure in this process is control...

Embodiment 2

[0051] In step S1, high-purity ytterbium oxide, cerium oxide, and gadolinium oxide-doped stabilized zirconia are used as raw material powders for the dense thermal barrier coating. Wherein, the purity of the ceramic powder is ≥99.9%, and the primary particle size of the ceramic powder is 25-50 nm.

[0052] Step S2, granulating the coating material powder to obtain the original powder and then performing plasma sintering.

[0053] In step S3, the ceramic powder is graded according to a specific particle size ratio, and fully and evenly mixed to obtain a ceramic thermal barrier coating powder raw material with unimodal particle size distribution characteristics. Among them, the peak of the medium particle size is 5-38 μm, accounting for 70wt%, and the fine powder and coarse powder accounting for 30wt%.

[0054] Step S4, using the powder obtained in step S3 as the raw material, by adjusting the spraying distance, spraying power, powder feeding amount, etc., the deposition pressu...

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Abstract

According to the preparation method of the compact and thick thermal barrier coating, the ceramic thermal barrier coating low in porosity and high in bonding strength is prepared through the high-energy plasma spraying technology by adopting the nano ceramic powder with unimodal grain size distribution as the raw material, the thermal shock resistance and the heat insulation performance of the coating are effectively improved, and then the use temperature of the coating is increased; the service life of the coating is prolonged.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing a dense and thick thermal barrier coating. Background technique [0002] Due to its advantages of high temperature resistance, corrosion resistance and heat insulation, ceramic-based thermal barrier coatings are widely used in the mid-moving blades of aero-engines and ground gas turbines and the outer ring of high-pressure turbines, and the application temperature can reach above 1100 ° C. At present, the highest temperature ceramic thermal barrier coating is applied, so as to effectively improve engine efficiency and operating safety. With the development of the aviation industry, higher demands are placed on the performance of ceramic thermal barrier coatings. The long-term service temperature of the ceramic thermal barrier coating is required to exceed 1100°C, and it has smaller pores, higher bonding strength and CMAS corrosion resistance. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/10C23C4/11
CPCC23C4/134C23C4/10
Inventor 卢晓亮黄松涛夏春阳章德铭冀晓鹃王旭侯伟骜彭浩然
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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