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Double-rare-earth zirconate thermal barrier coating material and preparation method thereof

A technology of thermal barrier coating and zirconate, which is applied in the direction of sustainable transportation, climate sustainability, air transportation, etc., can solve the problems of low thermal expansion coefficient, unfavorable bonding layer matching, large internal stress of materials, etc., and achieve impurity The effect of low content, reduced thermal mismatch stress, and low production cost

Active Publication Date: 2022-05-31
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a double rare earth zirconate thermal barrier coating material to solve the problem that the current thermal barrier coating material has a low thermal expansion coefficient, which is not conducive to its matching with the bonding layer, resulting in internal stress of the material big problem

Method used

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  • Double-rare-earth zirconate thermal barrier coating material and preparation method thereof
  • Double-rare-earth zirconate thermal barrier coating material and preparation method thereof
  • Double-rare-earth zirconate thermal barrier coating material and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a method for preparing the double rare earth zirconate thermal barrier coating material, comprising the following steps:

[0035] (1) The Nd 2 O 3 , Dy 2 O 3 , ZrO 2 calcined to obtain calcined Nd 2 O 3 , Dy 2 O 3 , ZrO 2 ;

[0036] (2) The calcined Nd 2 O 3 , Dy 2 O 3 , ZrO 2 Mixed with solvent, and then ball-milled to obtain mixed slurry;

[0037] (3) the mixed slurry is evaporated to dryness, calcined, and ground to obtain the mixture after primary grinding, and then the mixture after primary grinding is ball-milled, evaporated to dryness, and sieved to obtain mixed powder;

[0038] (4) pre-compressing the mixed powder into a block, and cold isostatic pressing to obtain a shaped block;

[0039] (5) Sintering the shaped block to obtain dense (Nd 1-x Dy x ) 2 Zr 2 O 7 ceramics.

[0040] In the present invention, in the step (1), the calcination temperature is preferably 900-1100°C, more preferably 1000°C; the ca...

Embodiment 1

[0052] High temperature and high thermal expansion coefficient (Nd 0.9 Dy 0.1 ) 2 Zr 2 O 7 Preparation of ceramic materials:

[0053] (1) The Nd 2 O 3 , Dy 2 O 3 , ZrO 2 After calcining at 1000℃ for 5h, after cooling to room temperature, Nd was weighed in molar ratio. 2 O 3 , Dy 2 O 3 , ZrO 2 A total of 15 g of the powder was mixed in 100 mL of anhydrous ethanol, and then placed in a planetary ball mill for ball milling (the speed of the ball mill was 250 r / min, and the ball milling time was 4 h). 1200 ℃ calcined for 5h.

[0054] (2) After calcination, grind the mixed powder evenly, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 10h); the ball milled powder is dried by rotary evaporation and passed through a 200-mesh sieve to obtain fine powder Then press hydraulic pressure into cylinder blocks of Φ15mm*1.5mm, and cuboid blocks of 55mm*6mm*4mm (the holding pressure of the cylindrical b...

Embodiment 2

[0058] High temperature and high thermal expansion coefficient (Nd 0.8 Dy 0.2 ) 2 Zr 2 O 7 Preparation of ceramic materials:

[0059] (1) The Nd 2 O 3 , Dy 2 O 3 , ZrO 2 After calcining at 1000℃ for 5h, after cooling to room temperature, Nd was weighed in molar ratio. 2 O 3 , Dy 2 O 3 , ZrO 2 A total of 15 g of the powder was mixed in 100 mL of anhydrous ethanol, and then placed in a planetary ball mill for ball milling (the speed of the ball mill was 250 r / min, and the ball milling time was 4 h). 1200 ℃ calcined for 5h.

[0060] (2) After calcination, grind the mixed powder evenly, and place it in a planetary ball mill for ball milling (the speed of the ball mill is 250r / min, and the ball milling time is 10h); the ball milled powder is dried by rotary evaporation and passed through a 200-mesh sieve to obtain fine powder Then press hydraulic pressure into cylinder blocks of Φ15mm*1.5mm, and cuboid blocks of 55mm*6mm*4mm (the holding pressure of the cylindrical b...

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Abstract

The invention belongs to the technical field of thermal barrier coating materials, and discloses a double-rare-earth zirconate thermal barrier coating material, which is prepared by the following steps: uniformly mixing three original powders of Nd2O3, Dy2O3 and ZrO2 through ball milling, calcining, and synthesizing a compact pure pyrochlore phase or pure fluorite phase double-rare-earth zirconate ceramic material in situ. According to the invention, small-radius rare earth ions are doped at the rare earth position of pyrochlore phase rare earth zirconate, an ordered and disordered transformation process is constructed, and lattice disordering is utilized to improve the high-temperature thermal expansion coefficient of the rare earth zirconate. The invention further provides a preparation method of the double-rare-earth zirconate thermal barrier coating material, the process is simple, the product preparation cost is low, the purity is high, the impurity content is low, and the double-rare-earth zirconate thermal barrier coating material is suitable for popularization and application and has important significance for developing the rare-earth zirconate thermal barrier coating material with high temperature and high thermal expansion coefficient.

Description

technical field [0001] The invention relates to the technical field of thermal barrier coating materials, in particular to a double rare earth zirconate thermal barrier coating material and a preparation method thereof. Background technique [0002] The thermal barrier coating is mainly used for large heat engines such as gas turbines and aero engines. With its better heat insulation effect, the surface temperature of the alloy blades in the heat engine can be lowered and the base alloy can be protected. The existence of thermal barrier coating can increase the engine inlet temperature, thereby improving the thermal efficiency of the heat engine, prolonging the service life of alloy components and reducing pollution. The currently used thermal barrier coating material is yttria-stabilized zirconia (YSZ), but YSZ will decompose into yttrium-rich and yttrium-poor phases at temperatures above 1200°C, resulting in coating failure. Rare earth zirconates have RE 2 Zr 2 O 7 The...

Claims

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Application Information

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IPC IPC(8): C04B35/488C04B35/622
CPCC04B35/488C04B35/622C04B2235/3224C04B2235/76C04B2235/762C04B2235/9607Y02T50/60
Inventor 万春磊杨泽生潘伟
Owner TSINGHUA UNIV
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