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High-entropy zirconia thermal barrier coating material with stable high-temperature phase and preparation method of high-entropy zirconia thermal barrier coating material

A technology of thermal barrier coating and zirconia, which is applied in the field of coating materials, can solve problems such as high fracture toughness, coating cracking and failure, and achieve the effect of high fracture toughness

Active Publication Date: 2022-06-28
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal barrier coating is a kind of structural ceramics applied on the surface of gas turbine alloys or jet engine blades to protect metal substrates from overheating failure during long-term service, and now the widely used 8YSZ (yttrium stabilized zirconia) thermal barrier coating The phase change of the material above 1200°C will lead to cracking and failure of the coating, and it cannot continue to be used at higher temperatures. With the increase of the thrust-to-weight ratio of the aeroengine, the engine outlet temperature rises. Preparation of a high-entropy oxide ceramic material with high fracture toughness

Method used

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  • High-entropy zirconia thermal barrier coating material with stable high-temperature phase and preparation method of high-entropy zirconia thermal barrier coating material
  • High-entropy zirconia thermal barrier coating material with stable high-temperature phase and preparation method of high-entropy zirconia thermal barrier coating material
  • High-entropy zirconia thermal barrier coating material with stable high-temperature phase and preparation method of high-entropy zirconia thermal barrier coating material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 6.396gHfCl 4 Dissolve with absolute ethanol, 6.445g ZrOCl 2 ·8H 2 O, 7.164g TaCl 5 Dissolve and mix with deionized water respectively to form solution A, 2.258gY 2 O 3 , 3.941gYb 2 O 3 Heating and dissolving with nitric acid and mixing them into solution B respectively, mixing solutions A and B into solution C, adding the mixed solution C dropwise to the ammonia solution (pH≥10) and stirring continuously to ensure that the system pH≥10 in the process of co-precipitation, Until the solution C is all dripped, let stand for 18 hours until the white precipitate is completely deposited at the bottom of the container; the precipitate is first centrifuged with deionized water for 6 times, and then centrifuged with absolute ethanol for 1 time, until the pH of the supernatant is close to 7 and drops. The centrifugation rate was 6000 r / min until no white precipitate was produced by adding the silver nitrate solution; the washed precipitate was dried in a drying oven, ...

Embodiment 2

[0031] Weigh 6.396gHfCl 4 Dissolve with absolute ethanol, 6.445g ZrOCl 2 ·8H 2 O, 5.403gNbCl 5 Dissolve and mix with deionized water respectively to form solution A, 2.258gY 2 O 3 , 3.941gYb 2 O 3 Heating and dissolving with nitric acid and mixing them into solution B respectively, mixing solutions A and B into solution C, adding the mixed solution C dropwise to the ammonia solution (pH≥10) and stirring continuously to ensure that the system pH≥10 in the process of co-precipitation, Until the solution C is all dripped, let stand for 18h until the white precipitate is completely deposited on the bottom of the container; the precipitate is first centrifuged with deionized water for 6 times, and then centrifuged with absolute ethanol for 1 time, until the supernatant pH=7 and dripping The centrifugation rate was 6000 r / min until no white precipitate was produced by adding the silver nitrate solution; the washed precipitate was dried in a drying oven, ground in a mortar and ...

Embodiment 3

[0035] Weigh 6.396gHfCl 4 Dissolve with absolute ethanol, 6.445g ZrOCl 2 ·8H 2 O, 7.164g TaCl 5 Dissolve and mix with deionized water respectively to form solution A, 2.258gY 2 O 3 , 1.379gSc 2 O 3 Heating and dissolving with nitric acid and mixing them into solution B respectively, mixing solutions A and B into solution C, adding the mixed solution C dropwise to the ammonia solution (pH≥10) and stirring continuously to ensure that the system pH≥10 during the co-precipitation process , until the solution C is all dripped, and let stand for 18h until the white precipitate is completely deposited at the bottom of the container; the precipitate is first centrifuged with deionized water for 6 times, and then centrifuged with absolute ethanol for 1 time, until the supernatant pH=7 and The centrifugation rate was 6000 r / min until the silver nitrate solution was added dropwise and no white precipitate was produced; the washed precipitate was dried in a drying oven, ground with ...

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Abstract

The invention discloses a high-temperature phase stable high-entropy zirconia thermal barrier coating material and a preparation method thereof. The molecular formula of the high-entropy zirconium oxide thermal barrier coating material is (2REx) ByZraHfbO2, wherein 0 lt; xlt; 0, 0.5, 0 lt; yt; Yt; 0, 0.5, 0 lt; a < lt >; 0, 0.5, 0 lt; blt; 2x + y + a + b = 1, RE is any two elements of Y, Yb, Sc, Gd and Nd, and B is one of Ta and Nb. The zirconium oxide-based high-entropy solid solution is obtained through the design of five or more than five main elements. Compared with an 8YSZ thermal barrier material, the high-entropy powder has higher fracture toughness and keeps phase stability at 1400 DEG C by utilizing the thermodynamic high-entropy effect, lattice distortion effect, hysteresis diffusion effect and synergistic enhancement effect of the 8YSZ thermal barrier material.

Description

technical field [0001] The invention relates to the technical field of coating materials, in particular to a high-temperature phase-stable high-entropy zirconia thermal barrier coating material and a preparation method thereof. Background technique [0002] Oxide structural ceramics have high wear resistance, corrosion resistance, high strength and high hardness, and have become high-temperature structural materials with high expectations, and are often used in advanced aero-engine hot-end components. Although the advantages of ceramics as aircraft materials are obvious, the inherent brittleness of ceramics greatly limits its widespread use. In order to overcome the disadvantage of low toughness of oxide-structured ceramic materials, researchers have conducted a lot of research to find practical toughening methods. [0003] High-entropy ceramic materials usually refer to multi-principal solid solutions formed by 5 or more elements. Due to their novel "high-entropy effect" a...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/50C04B35/626C04B35/622
CPCC04B35/48C04B35/50C04B35/626C04B35/62222C04B2235/3225C04B2235/444C04B2235/96Y02T50/60
Inventor 靳洪允段帅帅侯书恩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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