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A kind of neodymium-cerium composite zirconate thermal barrier coating material with ultra-low thermal conductivity and high-temperature phase stability and its preparation method

A technology of compounding zirconate and thermal barrier coating, which is applied in the field of thermal barrier coating, can solve the problem that the field of thermal barrier coating has not been paid attention to, and achieves improved thermal insulation effect, simple preparation method, high and high temperature phase stability Effect

Inactive Publication Date: 2019-07-16
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Cerium zirconate Ce 2 Zr 2 o 7+x (x=0~1) and Ln 2 Zr 2 o 7 It has a similar crystal structure [J.B.Thomson et al., J.Am.Ceram.Soc., 118, 11129 (1996)], but it is easy to decompose into two phases of cerium-rich and cerium-poor at 1200°C [M.Yashima et al .,J.Am.Ceram.Soc.,77,1067(1994)], has not received much attention in the field of thermal barrier coatings

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  • A kind of neodymium-cerium composite zirconate thermal barrier coating material with ultra-low thermal conductivity and high-temperature phase stability and its preparation method
  • A kind of neodymium-cerium composite zirconate thermal barrier coating material with ultra-low thermal conductivity and high-temperature phase stability and its preparation method
  • A kind of neodymium-cerium composite zirconate thermal barrier coating material with ultra-low thermal conductivity and high-temperature phase stability and its preparation method

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Effect test

preparation example Construction

[0033] According to one aspect of the present invention, the preparation method of the above-mentioned neodymium-cerium composite zirconate thermal barrier coating material is characterized in that it comprises:

[0034] With a purity of 99.99% Nd(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O is raw material, by mole ratio Nd(NO 3 ) 3 ·6H 2 O: Ce(NO 3 ) 3 ·6H 2 O:Zr(NO 3 ) 4 ·3H 2 O=(0.2-0.8): (0.2-0.8): 1 Weighing, prepare an aqueous solution with a total concentration of metal ions of 0.1mol / L, add additives citric acid and polyethylene glycol, and the addition amount is 50 grams / liter respectively , 30 g / L, magnetically stirred until a clear and transparent sol,

[0035] Using air with a purity of 99.99% and a pressure of 0.1 MPa as the atomizing medium, the sol was atomized into a corundum crucible at 400°C to quickly remove moisture to obtain the precursor of the neodymium-cerium composite zirconate thermal barrier coating material, and then ...

Embodiment 1

[0038] With a purity of 99.99% Nd(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O is raw material, by mole ratio Nd(NO 3 ) 3 ·6H 2 O: Ce(NO 3 ) 3 ·6H 2 O: Zr(NO 3 ) 4 ·3H 2 O=0.2:0.8:1 Weighing, preparing an aqueous solution with a total concentration of metal ions of 0.1mol / L, adding additives citric acid and polyethylene glycol, the addition amounts are 50 g / L and 30 g / L respectively, and magnetic stirring After 0.5 hours, a clear and transparent sol was obtained.

[0039] Using air with a purity of 99.99% and a pressure of 0.1 MPa as the atomizing medium, the sol was atomized into a corundum crucible at a temperature of 400°C to quickly remove moisture, and then calcined in an air atmosphere at 1200°C for 6 hours and then cooled to room temperature to obtain (Ce 0.8 Nd 0.2 ) 2 Zr 2 o 7.8 powder.

[0040] Put the above-mentioned synthesized powder into an agate mortar for grinding, take an appropriate amount and put it into a stainless steel...

Embodiment 2

[0048] With a purity of 99.99% Nd(NO 3 ) 3 ·6H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Zr(NO 3 ) 4 ·3H 2 O is raw material, by mole ratio Nd(NO 3 ) 3 ·6H 2 O: Ce(NO 3 ) 3 ·6H 2 O: Zr(NO 3 ) 4 ·3H 2 O=0.5:0.5:1 Weighing, preparing an aqueous solution with a total concentration of metal ions of 0.1mol / L, adding additives citric acid and polyethylene glycol, the addition amounts are 50 g / L and 30 g / L respectively, and magnetically stirred After 0.5 hours, a clear and transparent sol was obtained.

[0049] Using air with a purity of 99.99% and a pressure of 0.1MPa as the atomizing medium, the sol is atomized into a corundum crucible at a temperature of 400°C to quickly remove moisture to obtain a precursor, which is then calcined in an air atmosphere at 1200°C for 6 hours and then cooled. to room temperature, obtain (Ce 0.5 Nd 0.5 ) 2 Zr 2 o 7.5 powder.

[0050] Put the above-mentioned synthesized powder into an agate mortar for grinding, take an appropriate amount and pu...

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Abstract

The invention discloses an ultralow-thermal-conductivity stable-high-temperature-phase neodymium-cerium compounded zirconate thermal barrier coating material and a preparation method thereof. The thermal conductivity of the material is 60% lower or more than 60% lower than that of an existing thermal barrier coating material, and is also lower than the thermal conductivity of a rare earth zirconate material of the same kind; and on the other hand, no phase changes are generated within the interval between the room temperature and 1600 DEG C. The material is more beneficial to increase of the thermal simulation effect and working temperature of the thermal barrier coating, and can be used for the aerospace fields of aviation turbine engines, gas turbines, hypersonic-speed cruise missile hot end parts and the like.

Description

technical field [0001] The invention relates to a neodymium-cerium composite zirconate thermal barrier coating material with ultra-low thermal conductivity and high-temperature phase stability and a preparation method thereof, belonging to the field of thermal barrier coatings. Background technique [0002] Thermal Barrier Coatings (TBCs for short) are ceramic coatings deposited on the surface of high-temperature-resistant metals and have good heat insulation effects [N.P.Padture et al., Science, 296, 280 (2002)], which can make the matrix alloy material It is free from high-temperature oxidation and corrosion, and can reduce the working temperature of the substrate surface, improve the combustion efficiency of oil, and can also greatly extend the life of the engine. It has important applications in the fields of aviation gas turbine engines, gas turbines, and hypersonic cruise bombs. value. Increasing the gas inlet temperature can increase the thrust-to-weight ratio of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/48C04B35/622
CPCC04B35/48C04B35/622C04B2235/3224C04B2235/3229C04B2235/9607
Inventor 王欣江阔江海洋刘松柏
Owner SOUTHWEAT UNIV OF SCI & TECH
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