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Fluorite structure high-entropy oxide powder for thermal barrier coating and preparation method of fluorite structure high-entropy oxide powder

A technology of fluorite structure and thermal barrier coating is applied in the field of fluorite structure high-entropy oxide powder for thermal barrier coating and its preparation, which can solve the problem of enhanced phonon and defect scattering, can not meet the needs of gas turbine service, Low thermal expansion coefficient, etc., to achieve the effects of excellent comprehensive mechanical properties, shortened mean free path, and high thermal expansion coefficient

Active Publication Date: 2021-06-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the ceramic thermal barrier coating materials used in the high-temperature field are still mainly yttria-stabilized zirconia (YSZ), but there are still many problems in the current commercial application of YSZ thermal barrier coating materials: such as high-temperature phase stability, YSZ material will transform from a single cubic phase to a mixture of tetragonal phase (t) and cubic phase (c) at higher temperatures (>1200 ° C), and the tetragonal phase will transform into a monoclinic phase (m) during cooling , so YSZ can only be used at temperatures below 1200°C, which cannot meet the needs of future gas turbines serving at higher temperatures
(2) The thermal conductivity is low. Due to the existence of multiple components in high-entropy oxides, the mass gap and radius gap between different types of elements will increase the anharmonicity of lattice waves and enhance the scattering of phonons and defects, thereby Reduce the thermal conductivity of the material
However, the thermal expansion coefficient of the ceramic material is low, which limits its application.

Method used

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  • Fluorite structure high-entropy oxide powder for thermal barrier coating and preparation method of fluorite structure high-entropy oxide powder
  • Fluorite structure high-entropy oxide powder for thermal barrier coating and preparation method of fluorite structure high-entropy oxide powder
  • Fluorite structure high-entropy oxide powder for thermal barrier coating and preparation method of fluorite structure high-entropy oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example provides a fluorite-structured high-entropy oxide powder for thermal barrier coatings and its preparation method. The specific steps are as follows:

[0033] Step 1, set Y 2 o 3 , CeO 2 , ZrO 2 , HfO 2 , SnO 2 、TiO 2 The original powder is heated to 900°C for 2 hours to remove moisture and organic impurities. After cooling, the powder is weighed according to the molar ratio of 5:2:2:2:2:2 for batching, and the mixed powder is placed in a planetary ball mill to Water and ethanol were used as the medium, and zirconia balls were used as the grinding balls, and ball milled at a speed of 500r / min for 12h.

[0034] Step 2: Dry the ball-milled powder at 80°C for 12h, place it in a muffle furnace, and heat it at 5°C / min to 1200°C for 5h in an air atmosphere.

[0035] Step 3: Put the calcined powder in a planetary ball mill, use absolute ethanol as the medium, and zirconia balls as the grinding balls, and ball mill at a speed of 500 r / min for 24 hours.

[00...

Embodiment 2

[0039] This example provides a fluorite-structured high-entropy oxide powder for thermal barrier coatings and its preparation method. The specific steps are as follows:

[0040] Step 1, the Ho 2 o 3 , CeO 2 , ZrO 2 , HfO 2 , SnO 2 、TiO 2 The original powder is heated to 1000°C for 1 hour to remove moisture and organic impurities. After cooling, the powder is weighed according to the molar ratio of 5:2:2:2:2:2 for batching, and the mixed powder is placed in a planetary ball mill to Water and ethanol were used as the medium, and zirconia balls were used as the grinding balls, and ball milled at a speed of 450r / min for 16h.

[0041] Step 2: Dry the ball-milled powder at 80°C for 12h, place it in a muffle furnace, and heat it at 5°C / min to 1300°C for 3h in an air atmosphere.

[0042] Step 3: Put the calcined powder in a planetary ball mill, use absolute ethanol as the medium, and zirconia balls as the grinding balls, and ball mill at a speed of 500 r / min for 20 hours.

[0...

Embodiment 3

[0046] This example provides a fluorite-structured high-entropy oxide powder for thermal barrier coatings and its preparation method. The specific steps are as follows:

[0047] Step one, put Er 2 o 3 , CeO 2 , ZrO 2 , HfO 2 , SnO 2 、TiO 2 The original powder is heated to 800°C for 5 hours to remove moisture and organic impurities. After cooling, the powder is weighed according to the molar ratio of 5:2:2:2:2:2 for batching, and the mixed powder is placed in a planetary ball mill to remove Ionized water was used as the medium, and zirconia balls were used as the grinding balls, and the ball milled at a speed of 400r / min for 20h.

[0048] Step 2: Dry the ball-milled powder at 70°C for 24h, place it in a muffle furnace, and heat it at 2°C / min to 1100°C for 6h in an air atmosphere.

[0049] Step 3, put the calcined powder in a planetary ball mill, use deionized water as the medium, and zirconia balls as the grinding balls, and ball mill at a speed of 400 r / min for 24 hours...

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Abstract

The invention relates to fluorite structure high-entropy oxide powder for a thermal barrier coating and a preparation method of the fluorite structure high-entropy oxide powder. The powder has a single fluorite structure, and the chemical formula is RE2HE2O7, wherein RE is one of rare earth elements Y, Ho, Er, Yb and Lu, HE is at least three elements of Ce, Zr, Hf, Sn and Ti, and the mole number of each HE element accounts for 10%-30% of the total mole number of all the HE elements. The preparation method comprises the following steps of: mixing original powder of RE2O3 and HEO2 in proportion, heating the mixed powder to a certain temperature to carry out solid-phase reaction, and carrying out ball milling, drying and sieving to obtain the high-entropy ceramic powder. Compared with the prior art, a ceramic material prepared from the high-entropy oxide powder has the advantages of extremely low thermal conductivity, high thermal expansion coefficient, excellent comprehensive mechanical properties, simple process and wide application range, and can be applied to the field of ceramic thermal barrier coating materials.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coating materials and high-entropy ceramics, and in particular relates to a fluorite-structured high-entropy oxide powder for thermal barrier coatings and a preparation method thereof. Background technique [0002] Ceramic thermal barrier coatings (Thermal barrier coatings, TBCs) materials have a wide range of important applications in the fields of gas turbines, aerospace and large thermal power generation. In order to improve the gas efficiency of gas turbines and develop more advanced gas turbines, the operating temperature of gas turbine blades will be higher and higher in the future, and the thermal barrier coating material must reach this temperature. At present, the ceramic thermal barrier coating materials used in the high-temperature field are still mainly yttria-stabilized zirconia (YSZ), but there are still many problems in the current commercial application of YSZ thermal barri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G27/00C04B35/50C04B35/622
CPCC01G27/006C04B35/50C04B35/622C01P2002/72C01P2004/03C01P2006/32C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/6583C04B2235/9607
Inventor 何国何君杰陶景超
Owner SHANGHAI JIAO TONG UNIV
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