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A high-performance thermal barrier coating and its ceramic layer

A technology of thermal barrier coating and ceramic layer, applied in the direction of coating, metal material coating process, melt spraying, etc., can solve the problems of reducing the thermal cycle life of the coating, reducing the thermal insulation effect of the coating, etc., and achieving low cost , Improve efficiency and working temperature, prolong the effect of downtime

Active Publication Date: 2020-10-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Around 1000°C, this reversible phase transition between m-phase and t-phase produces a volume change of 3 to 5 Vol%, which reduces the thermal cycle life of the coating; in addition, the heat of the m-phase generated by this phase transition The conductivity (200°C, 5.4W / mK; 800°C, 3.6W / mK) is higher than that of the t′ phase (200°C, 2.8W / mK; 800°C, 2.8W / mK), which in turn reduces the insulation of the coating. heat effect

Method used

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  • A high-performance thermal barrier coating and its ceramic layer
  • A high-performance thermal barrier coating and its ceramic layer
  • A high-performance thermal barrier coating and its ceramic layer

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Embodiment 1

[0071] 1. Sol-spray pyrolysis synthesis powder.

[0072] With a purity of 99.99% Y (NO 3 ) 3 ·6H 2 O and Zr(NO 3 ) 4 ·3H 2 O is the raw material, in molar ratio Y(NO 3 ) 3 ·6H 2 O:Zr(NO 3 ) 4 ·3H 2 O=0.08:0.92 ingredients, using deionized water as a solvent, prepare an aqueous solution with a total concentration of metal ions of 0.2mol / L, stir magnetically for 1-3h until it is clear and transparent, then add additives such as citric acid hexahydrate and a molecular weight of 20000 Polyethylene glycol, wherein citric acid add-on 160g / L, polyethylene glycol 20g / L, stir until clear and transparent through magnetic force again, thereby make sol;

[0073] The above-prepared sol was atomized into a corundum crucible by a pressure atomization method, the atomization pressure was 0.3 MPa, and the temperature of the corundum crucible was 500°C. After the atomization of the sol, the temperature of the corundum crucible was raised to 1000°C for 2 hours and then cooled to room...

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Abstract

The invention discloses a preparation method for a high-performance thermal barrier coating and specifically discloses a 4YSZ (4mol% Y2O3 stabilized ZrO2) thermal barrier coating and the preparation method of the 4YSZ thermal barrier coating. The 4YSZ powder which is of a fine nano-structure, uniform ingredients and a pure tetragonal phase structure is prepared utilizing a sol-spray pyrolysis synthetic process, and the 4YSZ powder is subjected to spray drying granulation, screening and atmospheric plasma spraying (APS) in sequence to prepare the coating. The high-performance thermal barrier coating prepared by the invention is of a pure tetragonal phase nano-structure with uniform ingredients, compared with a traditional YSZ casting, the high-performance thermal barrier coating has the advantages of being low in thermal diffusion coefficient, good in high temperature phase stability and thermal shock resistance, simple in preparation process and low in cost and the like; and the high-performance thermal barrier coating is more conducive to improving the efficiency and working temperature of a turbine engine, and the service life of the engine is prolonged.

Description

technical field [0001] The invention relates to a high-performance thermal barrier coating and its ceramic layer, belonging to the field of metal surface corrosion and protection. The present invention also relates to the application of a 4YSZ powder as a material for preparing the above ceramic layer. Background technique [0002] Thermal barrier coating (TBC) is to combine high temperature resistant, low thermal conductivity, corrosion resistant ceramic materials with matrix alloy in the form of coating to reduce the surface temperature of metal hot end parts and improve the resistance of matrix alloy to high temperature oxidation and corrosion. It has extensive and significant application value in aviation, aerospace, large-scale thermal power generation, etc. [0003] Currently, the most widely used TBC is 7-8wt% YO 1.5 Stable ZrO 2 (7YSZ). Compared with recent developments such as Ln 2 Zr 2 o 7 (Ln=La-Yb or binary rare earth compound), La 2 Ce 2 o 7 and GdO 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/134C23C4/11
Inventor 王福会江阔鲍泽斌王欣刘松柏
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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