Co-doped modified pyrochlore thermal-barrier coating material with ultralow thermal conductivity and preparation method of co-doped modified pyrochlore thermal-barrier coating material

A technology of thermal barrier coating and thermal conductivity, which is applied in the field of ultra-low thermal conductivity co-doped modified pyrochlore thermal barrier coating material and its preparation, which can solve the problem that it is difficult to meet the application requirements and should not exceed 1200 °C, etc. question

Active Publication Date: 2021-06-15
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]With the development of the new generation of aero-engines, their thrust and thrust-to-weight ratio continue to increase, causing the temperature at the front inlet of the turbine to continue to increase. The inlet temperature exceeds 1500°C, and the inlet temperature before the turbine of the fifth-generation engine will exceed 1700°C. However, the service temperature of the traditional t'-YSZ thermal barrier coating is generally considered to be no more than 1200°C, which is difficult to meet the application requirements. It is necessary to develop a resistant High temperature thermal barrier coating material with better temperature resistance

Method used

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  • Co-doped modified pyrochlore thermal-barrier coating material with ultralow thermal conductivity and preparation method of co-doped modified pyrochlore thermal-barrier coating material
  • Co-doped modified pyrochlore thermal-barrier coating material with ultralow thermal conductivity and preparation method of co-doped modified pyrochlore thermal-barrier coating material
  • Co-doped modified pyrochlore thermal-barrier coating material with ultralow thermal conductivity and preparation method of co-doped modified pyrochlore thermal-barrier coating material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A low thermal conductivity Y- and Ce-co-doped modified La 2 Zr 2 o 7 Pyrochlore ((La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 o 7 , x=y=0.1) the preparation method of solid solution, comprises the following steps:

[0038] (1) Use Y with a particle size of not more than 10 μm 2 o 3 ,La 2 o 3 ,ZrO 2 ,CeO 2 The powder is weighed according to the preset ratio, and then it is ball milled in a high-energy ball mill tank with distilled water as a medium at a speed of 400r / min for 24 hours. The obtained powder slurry is freeze-dried and calcined at 1500°C for 24 hours, so that the The oxides react fully to form the desired components (La 0.9 Y 0.1 ) 2 (Zr 0.9 Ce 0.1 ) 2 o 7 ;

[0039] (2) The obtained components are fully crushed in a mortar, and then ball milled with distilled water as a medium at a speed of 400r / min for 24 hours, and the obtained slurry is freeze-dried to obtain a well-dispersed powder;

[0040] (3) The finally obtained powder is formed by cold pr...

Embodiment 2

[0042] A low thermal conductivity Y- and Ce-co-doped modified La 2 Zr 2 o 7 Pyrochlore (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 o 7 The preparation method of solid solution, get x=0.2, y=0.3, other are the same as implementation 1.

Embodiment 3

[0044] A low thermal conductivity Y- and Ce-co-doped modified La 2 Zr 2 o 7 Pyrochlore (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 o 7 For the preparation method of solid solution, get x=y=0.3, and others are the same as implementation 1.

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Abstract

The invention provides a co-doped modified pyrochlore thermal-barrier coating material with ultralow thermal conductivity and a preparation method thereof. The chemical composition of a thermal-barrier coating is (RE<1-x>A<x>)<2>(Zr<1-y>B<y>)<2>O<7>, wherein A<3+> replaces an RE site, the ion radius of the displacing ion A<3+> is smaller than the ion radius of the original ion RE<3+>, and a strong scattering phonon effect of a resonator is formed; a Zr site is replaced by B<4+>, the ion radius of the displacing ion B<4+> is larger than the ion radius of the original ion Zr<4+>, and a lattice softening effect is formed; and RE is any rare earth element, the doping element A is yttrium or scandium or bismuth or indium or any lanthanide element, and the doping element B is cerium. The full-temperature-range thermal conductivity of a completely-compact ceramic block prepared from the co-doped modified pyrochlore thermal-barrier coating material provided by the invention is 1.0-1.10 W / mK, and the material has wide application prospects in the field of high-temperature thermal-barrier coatings.

Description

technical field [0001] The invention relates to the preparation technology of an ultra-low thermal conductivity high temperature resistant ceramic material, in particular to an ultra-low thermal conductivity co-doped modified pyrochlore thermal barrier coating material and a preparation method thereof. Background technique [0002] Thermal barrier coating (Thermal barrier coating, TBC) refers to a ceramic coating system deposited on the surface of high-temperature resistant alloy parts (such as the hot end parts of aero-engines) with excellent thermal insulation properties. Its application can significantly reduce the working temperature of the substrate, protect the metal substrate from high-temperature gas erosion, improve its high-temperature working life, and then increase the thrust and thrust-to-weight ratio of the aero-engine. Thermal barrier coating materials need to have low thermal conductivity, high melting point, high chemical stability, thermal expansion coeffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/488C04B35/622
CPCC04B35/488C04B35/622C04B2235/3225C04B2235/3227C04B2235/3229C04B2235/656C04B2235/6567C04B2235/762C04B2235/96C04B2235/9607Y02T50/60
Inventor 王衍飞刘荣军万帆
Owner NAT UNIV OF DEFENSE TECH
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