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Ceramic nanometer composite material for heat barrier coating and preparation method of ceramic nanometer composite material

A nano-composite material and thermal barrier coating technology, applied in the field of ceramic nano-composite materials, can solve the problems of difficulty in meeting the turbine inlet temperature, high thermal expansion coefficient, complicated preparation process, etc., and achieve good high-temperature chemical stability, high phase purity, Simple preparation method

Inactive Publication Date: 2012-11-21
INNER MONGOLIA UNIV OF TECH
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Problems solved by technology

[0006] The present invention provides a ceramic nanocomposite material for thermal barrier coatings and a preparation method thereof, aiming to solve the shortcomings of the ceramic thermal barrier coating materials provided by the prior art, that is, they cannot simultaneously have a high coefficient of thermal expansion, excellent High-temperature chemical stability, low thermal conductivity, and high toughness are difficult to meet the needs of further increasing the turbine inlet temperature, and the problems of long calcination time, complicated preparation process, long time consumption and high energy consumption when preparing the above materials

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  • Ceramic nanometer composite material for heat barrier coating and preparation method of ceramic nanometer composite material
  • Ceramic nanometer composite material for heat barrier coating and preparation method of ceramic nanometer composite material

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preparation example Construction

[0048] The preparation method comprises the following steps:

[0049] Step 1: Prepare the first reaction solution

[0050] With Sr(NO 3 ) 2 and Zr(NO 3 ) 4 ·5H 2 O is the raw material, mixed according to the molar ratio of (1-x): (1-x) (where 0.1≤x≤0.9, Ln is one of La, Nd, Sm, Eu, Gd, Dy), and put into the reaction vessel 1 and distilled water was added, stirred with a magnetic stirrer until clear and transparent to prepare the first reaction solution.

[0051] The second step: prepare the second reaction solution

[0052] A certain amount of ammonium oxalate and distilled water were put into the reaction vessel 2, stirred with a magnetic stirrer until clear and transparent to obtain a second reaction solution.

[0053] The third step: prepare the third reaction solution

[0054] Pour the first reaction solution into a separatory funnel, and add it dropwise to the second reaction solution. The whole dropping process is continuously stirred and ammonia water is continu...

Embodiment 1

[0091] Preparation of nanocomposites (Sr 0.5 La 0.5 ) ZrO 3.25 , accurately measure the molar ratio as La(NO 3 ) 3 ·6H 2 O:Zr(NO 3 ) 4 ·5H 2 O=1:1, using distilled water as a solvent, prepare 100ml of a solution with a total solution concentration of 0.5mol / L, and place it on a magnetic stirrer to stir to fully dissolve the raw materials, and transfer the solution to a separatory funnel. Add the solution in the separatory funnel drop by drop to the diluted ammonia water, while stirring continuously with a magnetic stirrer, keep the pH value of the solution at about 10 during the whole dropping process. In addition, accurately measure the molar ratio as Sr(NO 3 ) 2 : Zr(NO 3 ) 4 ·5H 2 O=1:1 (wherein La(NO 3 ) 3 ·6H 2 O:Sr(NO 3 ) 2 =1:1), prepare 100ml of solution whose total solution concentration is 0.5mol / L, and place it on a magnetic stirrer to stir to make the raw material fully dissolve, and transfer the solution to a separatory funnel. Add the solution i...

Embodiment 2

[0093] Prepare nanocomposite material (Sr with the method for embodiment 1 0.3 La 0.7 ) ZrO 3.35 , accurately measure the molar ratio as La(NO 3 ) 3 ·6H 2 O:Zr(NO 3 ) 4 ·5H 2 O=1:1, using distilled water as a solvent, prepare 100ml of a solution with a total solution concentration of 0.084mol / L, and place it on a magnetic stirrer to stir to fully dissolve the raw materials, and transfer the solution to a separatory funnel. Add the solution in the separatory funnel drop by drop to the diluted ammonia water, while stirring continuously with a magnetic stirrer, keep the pH value of the solution at about 10 during the whole dropping process. In addition, accurately measure the molar ratio as Sr(NO 3 ) 2 : Zr(NO 3 ) 4 ·5H 2 O=1:1 (wherein La(NO 3 ) 3 ·6H 2 O:Sr(NO 3 ) 2 =7: 3), the preparation total solution concentration is the solution 100ml of 0.036mol / L, and is placed on the magnetic stirrer and stirred to make raw material fully dissolve, and solution is trans...

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Abstract

The invention belongs to the technical field of a ceramic nanometer composite material, and provides a ceramic nanometer composite material for a heat barrier coating and a preparation method of the ceramic nanometer composite material. Cheap Ln(NO3)3.6H2O, Sr(NO3)2 and Zr(NO3)4.5H2O are used as raw materials and are subjected to solution preparation, sedimentation, suction filtration, drying and calcination to obtain the required ceramic nanometer composite material. The size of crystal grains of each phase in the prepared ceramic nanometer composite material is less than 70 nm; each phase is uniform in distribution; the ceramic nanometer composite material has good high-temperature chemical stability, scouring resistance and heat insulation; growth of the crystal grains under a high temperature condition is favorably suppressed; the mechanical property, particularly toughness, of the ceramic nanometer composite material is improved; and the ceramic nanometer composite material is used as a superior candidate material for the heat barrier coating. The ceramic nanometer composite material has the advantages of simple preparation method, relatively low synthesis temperature, short time, high phase purity, energy saving, suitability for large-scale synthesis and high promotion and application values.

Description

technical field [0001] The invention belongs to the technical field of ceramic nanocomposite materials, and in particular relates to a ceramic nanocomposite material used for thermal barrier coatings and a preparation method thereof. Background technique [0002] Ceramic thermal barrier coatings (Thermal Barrier Coatings, TBCs) are currently one of the most advanced high-temperature protective coatings, with good high-temperature chemical stability, erosion resistance and heat insulation, etc. High-temperature oxidation and corrosion, and can reduce the working temperature of the metal substrate surface, improve fuel economy, and can greatly prolong the life of the turbine engine. Since its appearance in the early 1970s, it has been widely valued and developed rapidly. [0003] In recent years, with the development of aviation gas turbine engines in the direction of high flow ratio, high thrust-to-weight ratio, and high inlet temperature, the temperature and pressure of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/48C04B35/50C04B35/626
Inventor 马文李厚阳董红英赵金兰龚沛白玉
Owner INNER MONGOLIA UNIV OF TECH
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