High-temperature and low-thermal conductivity bismuth oxide-based thermal barrier coating material and preparation method thereof

A technology of thermal barrier coating and low thermal conductivity, which is applied in the field of hafnium oxide-based thermal barrier coating materials and its preparation, can solve the problems of thermal conductivity improvement, achieve high-temperature phase stability, simple synthesis method, good barrier The effect of thermal radiation heat transfer performance

Active Publication Date: 2018-08-24
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the thermal conductivity of the traditional thermal barrier coating material YSZ is significantly improved by phase change and radiation heat transfer under hi

Method used

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  • High-temperature and low-thermal conductivity bismuth oxide-based thermal barrier coating material and preparation method thereof
  • High-temperature and low-thermal conductivity bismuth oxide-based thermal barrier coating material and preparation method thereof
  • High-temperature and low-thermal conductivity bismuth oxide-based thermal barrier coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Embodiment one: HfO 2 Preparation of thermal barrier coating materials.

[0031] (1) Take nanoscale powder HfOCl 2 ·8H 2 O, heated in a water bath at 80°C, and stirred for five minutes until clear and transparent. Add citric acid and stir magnetically for half an hour until viscous sol is formed. Among them, Hf 4+ The molar ratio of ions and citric acid is 1:2.

[0032] (2) Heat the sol in a drying oven at 80°C for 12 hours to form a xerogel. Heat the dry gel in a box furnace at 1000°C for two hours, and grind it in an agate mortar to obtain a fine powder.

[0033] (3) Cold press the above fine powder into a diameter left and right discs. After heating up to 1000°C at a heating rate of 2°C / min, the temperature was raised to 1500°C at a heating rate of 1.33°C / min, kept for 5 hours and then cooled to 25°C with the furnace to obtain HfO 2 blocks.

[0034] XRD shows HfO 2 The bulk material is monoclinic phase, and it is found that there is no microcrack in the s...

Example Embodiment

[0035] Example 2: Preparation of YSH4 thermal barrier coating material.

[0036] (1)Y 2 o 3 Dissolve in 70% concentrated nitric acid, heat in a water bath at 80°C, and stir magnetically until completely transparent. Add stoichiometric ratio of HfOCl 2 ·8H 2 O, continue to stir for five minutes until clear and transparent. Adding citric acid makes the cation (Hf 4+ with Y 3+ ) and citric acid in a molar ratio of 1:2, magnetically stirred for half an hour until viscous sol was formed.

[0037] (2) Heat the sol in a drying oven at 80°C for 12 hours to form a xerogel. Heat the dry gel in a box furnace at 1000°C for two hours, and grind it in an agate mortar to obtain a fine powder.

[0038] (3) Cold press the above fine powder into a diameter left and right discs. After heating up to 1000°C at a heating rate of 2°C / min, the temperature was raised to 1500°C at a heating rate of 1.33°C / min, held for 5 hours, and then cooled to 25°C with the furnace to obtain YSH4 blocks.

...

Example Embodiment

[0041] Example 3: Preparation of YSH8 and YSH12 thermal barrier coating materials.

[0042] (1)Y 2 o 3 , HfO 2 Weigh with stoichiometric ratio YSH8, add alcohol to the mixed powder, mix and grind for 8 hours, dry at 80°C for 12 hours, sinter at 1600°C for 5 hours, and cool in the furnace to room temperature.

[0043] (2) Continue to add alcohol to the powder after cooling in the furnace to grind for 8 hours, ball mill and dry the ground powder (80°C for 12 hours), then manually grind, and pass through a 200-mesh sieve to obtain a fine powder.

[0044] (3) Cold press the above fine powder into a diameter left and right discs. The temperature was raised to 1000°C at a heating rate of 2°C / min, and then to 1600°C at a heating rate of 1.33°C / min, kept for 5 hours and then cooled to room temperature 25°C with the furnace to obtain YSH8 blocks.

[0045] Change the stoichiometric ratio to YSH12, and prepare YSH12 blocks according to the same method steps and conditions as above....

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Abstract

The invention discloses a high-temperature and low-thermal conductivity bismuth oxide-based thermal barrier coating material and a preparation method thereof and belongs to the technical field of thermal barrier coating materials. The thermal barrier coating material is an yttrium oxide-stabilized hafnium oxide material system, and the chemical composition of the material is Hf1-xYxO2-0.5x, wherein x is more than 0 but less than or equal to 0.2. The material disclosed by the invention has the characteristics of high-temperature phase stability and low radiation heat transfer at a high temperature and can ensure that in a combustion chamber high temperature service environment, the thermal conductivity is not greatly increased by thermal radiation. Due to high high-temperature phase stability, the yttrium oxide-stabilized hafnium oxide ceramic material can be used for designing and preparing a novel high-temperature thermal barrier coating material of which the usage temperature is notlower than 1500 DEG C.

Description

technical field [0001] The invention belongs to the technical field of thermal barrier coatings, and relates to a hafnium oxide-based thermal barrier coating material with high-temperature thermal stability and low thermal radiation heat transfer and a preparation method thereof. Background technique [0002] Thermal barrier coatings (TBCs) are a thermal protection technology that uses high-temperature-resistant and low-thermal-conductivity ceramic materials to combine with metals in the form of coatings, thereby reducing the temperature of metal surfaces in high-temperature environments. The application of thermal barrier coatings to high-pressure turbine blades of aeroengines can significantly reduce the surface temperature of turbine blade alloys, greatly extend the working life of blades, and improve engine thrust and efficiency. Traditional thermal barrier coating materials use yttria partially stabilized zirconia, that is, 6-8wt% YSZ, which has excellent comprehensive ...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/624
CPCC04B35/48C04B35/624C04B2235/3225C04B2235/6562C04B2235/6567
Inventor 郭洪波李春马岳
Owner BEIHANG UNIV
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