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CMAS-corrosion-resistant multi-component high-entropy pyrochlore structure thermal barrier coating material and preparation method and application thereof

A pyrochlore structure, thermal barrier coating technology, applied in chemical instruments and methods, inorganic chemistry, zirconium compounds, etc., can solve the problems of easy cracking and shedding, limited practical application, low thermal expansion coefficient, etc., to improve corrosion resistance. performance, improving thermal expansion and fracture toughness, reducing thermal conductivity

Inactive Publication Date: 2021-12-10
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, rare earth zirconate materials have low thermal expansion coefficient and poor fracture toughness, and are prone to cracking and falling off during thermal cycling, which greatly limits the practical application of this material in the field of thermal barrier coatings.

Method used

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  • CMAS-corrosion-resistant multi-component high-entropy pyrochlore structure thermal barrier coating material and preparation method and application thereof
  • CMAS-corrosion-resistant multi-component high-entropy pyrochlore structure thermal barrier coating material and preparation method and application thereof
  • CMAS-corrosion-resistant multi-component high-entropy pyrochlore structure thermal barrier coating material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (Yb 0.2 Nd 0.2 SM 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 o 7 Preparation of (YHZ): Dissolve ytterbium nitrate, neodymium nitrate, samarium nitrate, europium nitrate and gadolinium nitrate in deionized water to prepare a 0.2mol / L nitrate solution, and dissolve zirconium oxychloride in deionized water to prepare a 0.5 mol / L solution. Mix the solutions in proportion to obtain a mixed solution with a molar ratio of ytterbium ions: neodymium ions: samarium ions: europium ions: gadolinium ions: zirconium ions=1:1:1:1:1:5. The mixed solution was dropped dropwise into excess ammonia solution, and hydroxide precipitate was obtained after stirring and aging, wherein the stirring time was 2 h, and the precipitation aging time was 12 h. The hydroxide precipitate was centrifuged and washed until the silver nitrate solution was added to the supernatant, and no precipitate was formed. After the hydroxide precipitate is dispersed with ethanol, it is dried, ground, sieved with 300 mesh, an...

example 2

[0038] (La 0.2 Nd 0.2 SM 0.2 Eu 0.2 Gd 0.2 ) 2 Zr 2 o 7Preparation of (LHZ): Dissolve lanthanum nitrate, neodymium nitrate, samarium nitrate, europium nitrate and gadolinium nitrate in deionized water to prepare a 0.2mol / L nitrate solution, and dissolve zirconium oxychloride in deionized water to prepare a 0.5 mol / L solution. Mix the solutions in proportion to obtain a mixed solution with a molar ratio of lanthanum ions: neodymium ions: samarium ions: europium ions: gadolinium ions: zirconium ions=1:1:1:1:1:5. The mixed solution was dropped dropwise into excess ammonia solution, and hydroxide precipitate was obtained after stirring and aging, wherein the stirring time was 2 h, and the precipitation aging time was 12 h. The hydroxide precipitate was centrifuged and washed until the silver nitrate solution was added to the supernatant, and no precipitate was formed. After the hydroxide precipitate is dispersed with ethanol, it is dried, ground, sieved with 300 mesh, and...

example 3

[0042] (Y 0.2 La 0.2 Nd 0.2 SM 0.2 Gd 0.2 ) 2 (Zr 0.5 Ti 0.5 ) 2 o 7 Preparation: Dissolve yttrium nitrate, lanthanum nitrate, neodymium nitrate, samarium nitrate and gadolinium nitrate in deionized water to make 0.2mol / L nitrate solution, and dissolve zirconium nitrate in deionized water to make 0.5mol / L For the solution, tetrabutyl titanate was dissolved in ethylene glycol to form a 0.5mol / L solution, and citric acid was mixed with ethylene glycol at a ratio of total metal ions: citric acid = 1:1.2, and stirred until a transparent solution was formed. Mix the solutions in proportion to obtain a mixed solution with a molar ratio of yttrium ion: lanthanum ion: neodymium ion: samarium ion: gadolinium ion: zirconium ion: titanium ion = 2:2:2:2:2:5:5, adjusted with ammonia water The pH of the solution is neutral, heated at 80°C until gel is formed, the gel is calcined at 500°C for 2 hours, the obtained powder is ground to 300 mesh and sieved, and calcined at 1300°C for 4...

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Abstract

The invention discloses a CMAS-corrosion-resistant multi-component high-entropy pyrochlore-structured thermal barrier coating material as well as a preparation method and an application thereof. The chemical formula of the thermal barrier coating material is A2B2O7, A comprises at least five elements of rare earth elements, Al and Ba, and B is one or more of Zr, Ti, Hf, Nb and Ce. The invention provides the CMAS corrosion resistant multi-component high-entropy pyrochlore structure thermal barrier coating material prepared through more than five multi-principal component designs. The low heat conductivity and the improved thermal expansion and fracture toughness are obtained through the high-entropy effect, meanwhile, the corrosion resistance of the thermal barrier coating material can be further improved by introducing anti-corrosion elements such as Al, Ba, Ti and Hf, and therefore the thermal barrier coating material with the excellent comprehensive performance is obtained, and the thermal barrier coating material has the wide application prospect in the field of next-generation engine thermal barrier coatings with the high thrust-weight ratio.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to a multi-component high-entropy pyrochlore structure thermal barrier coating material resistant to CMAS corrosion and its preparation method and application. Background technique [0002] With the development of aero-engines towards a higher thrust-to-weight ratio and lower fuel consumption, the design inlet temperature of the engine continues to increase, and its operating temperature can reach up to 1650°C, which puts forward higher requirements for the thermal insulation coating on the surface of the hot-end parts of the engine . Yttrium-stabilized zirconia (6-8wt.% Y 2 o 3 stabilized ZrO 2 , YSZ), the material will undergo phase transition and rapid sintering when the temperature exceeds 1200 °C, sintering will reduce the thermal insulation performance and strain tolerance of the coating, increase the elastic modulus of the coating, and the YSZ phase transition w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/00
CPCC01G25/006C01P2002/72C01P2004/03C01P2006/32
Inventor 罗丽荣靳洪允周明侯书恩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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