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High-entropy ultrahigh-temperature zirconia-based thermal barrier coating material, preparation method and application thereof and zirconia-based thermal barrier coating

A thermal barrier coating, zirconia-based technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problem of low thermal expansion coefficient and fracture toughness, reduced coating strain tolerance, coating thermal Short cycle life and other issues, to achieve the effect of alleviating thermal expansion mismatch, improving high temperature strain tolerance, and good resistance to CMAS penetration corrosion

Pending Publication Date: 2022-06-28
EAST CHINA UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pyrochlore rare earth zirconate Ln widely reported at home and abroad 2 Zr 2 o 7 , Perovskite structure zirconate SrZrO 3 , Fluorite structure rare earth cerate Ln 2 Ce 2 o 7 , Rare earth tantalate LnTaO 4 , rare earth niobate Ln 3 NbO 7 (Ln is a rare earth element) has lower thermal conductivity than traditional YSZ, and has better phase stability at high temperature. However, these materials are generally prone to sintering at high temperatures (densification porosity decreases, which will reduce the strain tolerance of the coating and the metal substrate. The increase of the thermal stress leads to the peeling failure of the coating), the thermal expansion coefficient and fracture toughness are low, or the processing adaptability of the coating is poor, and the thermal cycle life of the coating is short, which cannot meet the application requirements

Method used

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  • High-entropy ultrahigh-temperature zirconia-based thermal barrier coating material, preparation method and application thereof and zirconia-based thermal barrier coating
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  • High-entropy ultrahigh-temperature zirconia-based thermal barrier coating material, preparation method and application thereof and zirconia-based thermal barrier coating

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preparation example Construction

[0033] As the first method (arc melting method) of the present invention, the present invention provides the preparation method of the zirconia-based thermal barrier coating material described in the above technical solution, comprising the following steps:

[0034] Mixing yttrium oxide, cerium oxide, and four rare earth oxides corresponding to the second rare earth element with molten zirconia, and smelting to obtain a ceramic molten liquid;

[0035] The ceramic melt is crushed to obtain a zirconia-based thermal barrier coating material.

[0036] In the present invention, unless otherwise specified, the required preparation raw materials are all commercially available products well known to those skilled in the art.

[0037] In the present invention, yttrium oxide, cerium oxide, and four rare earth oxides corresponding to the second rare earth element are mixed with molten zirconia, and smelted to obtain a ceramic molten liquid. In the present invention, the zirconia is prefer...

Embodiment 1

[0079] Preparation of zirconia-based thermal barrier coating materials (Sm 0.2 Gd 0.2 Dy 0.2 Yb 0.2 Y 0.2 ) 2 (Zr 0.7 Ce 0.3 ) 2 O 7 ;

[0080] According to the stoichiometric ratio determined by the chemical formula, the oxide powders corresponding to Sm, Gd, Dy, Yb and Y were calcined at 800 °C for 120 min, and the ZrO 2 The powder was put into the electric arc furnace, smelted at 2700 ℃ for 60min, and then added CeO 2 The powder is smelted at 2700℃ for 60min; the weighed Sm 2 O 3 , Gd 2 O 3 , Dy 2 O 3 , Yb 2 O 3 and Y 2 O 3 The powder is put into the electric arc furnace for smelting for 100min at the same time, and the inclined electric arc furnace is adopted. 2 The obtained ceramic melt is crushed to 200 μm~1mm with compressed air, and the powder is crushed to 200nm~5 μm by a mechanical crushing method, so as to obtain a zirconia-based thermal barrier coating material.

Embodiment 2

[0082] Zirconia-based thermal barrier coating materials (Nd 0.2 Gd 0.2 Eu 0.2 Tb 0.2 Y 0.2 ) 2 Zr 2 O 7 :

[0083] According to the stoichiometric ratio determined by the chemical formula, five rare earth oxide powders except Zr were calcined at 800 °C for 120 min; the five rare earth oxides were dissolved in concentrated nitric acid, and the liquid was evaporated to dryness to obtain water-soluble rare earth oxides. Nitrate crystals; five rare earth nitrates and ZrOCl 2 The crystals were dissolved in deionized water, stirred at room temperature for 30 min, and then mixed with five rare earth nitrate solutions and ZrOCl. 2 The solution was mixed and stirred for 1 h to obtain a mixed brine solution;

[0084] Add 1.5 mol / L ammonia water dropwise to the above mixed brine solution, and continue to stir rapidly until the pH of the solution as a whole is ≥ 12.5, stop adding ammonia water dropwise, and continue to stir and age for 2 hours; filter the precipitated suspension,...

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Abstract

The invention provides a high-entropy ultrahigh-temperature zirconia-based thermal barrier coating material, a preparation method and application thereof and a zirconia-based thermal barrier coating, and belongs to the technical field of high-temperature coating materials. The zirconia-based thermal barrier coating material has the advantages of no phase change, low thermal conductivity, high thermal expansion coefficient, high fracture toughness, low sintering rate and good CMAS corrosion resistance, the zirconia-based thermal barrier coating material is used for a thermal barrier coating, a double-ceramic-layer structure is adopted, YSZ is used as a bottom layer, the zirconia-based thermal barrier coating material is used as a surface thermal barrier ceramic layer, and the thermal barrier coating material has the advantages of high thermal conductivity, high thermal expansion coefficient, high fracture toughness and good CMAS corrosion resistance. The thermal expansion mismatching between the high-entropy thermal barrier ceramic top layer and the metal bonding layer and the high-temperature chemical stability compatibility between the high-entropy thermal barrier ceramic top layer and the thermal growth oxide layer TGO layer can be effectively relieved, so that the long-life service of the thermal barrier coating within the temperature range of 1300-1600 DEG C is achieved, the thermal shock resistance cycle life is long, and the CMAS permeation corrosion resistance is good. Therefore, the material can be used for high-temperature hot end components of aero-engines or gas turbines.

Description

technical field [0001] The invention relates to the technical field of high-temperature coating materials, in particular to a high-entropy ultra-high temperature zirconia-based thermal barrier coating material, a preparation method and application thereof, and a zirconia-based thermal barrier coating. Background technique [0002] As the turbine inlet temperature of aero-engines and gas turbines continues to increase, the service environment of thermal barrier coatings is more severe. The long-term use temperature of traditional YSZ thermal barrier coating is ≥1250℃, rapid phase transformation and sintering will occur, resulting in residual stress accumulation and premature spalling failure. In addition, dust and volcanic ash (mainly CaO-MgO-Al) inhaled from the atmosphere 2 O 3 -SiO 2 , CMAS) to form a low-melting glass phase adsorbed on the surface of the thermal barrier coating, resulting in chemical degradation and peeling failure of the thermal barrier coating, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/134C23C4/073
CPCC23C4/10C23C4/134C23C4/073Y02T50/60
Inventor 张显程陈小龙涂善东张丁午王晓博王卫泽
Owner EAST CHINA UNIV OF SCI & TECH
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