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Rare earth zirconate porous ceramic with hierarchical pore structure and preparation method thereof

A technology of porous ceramics and zirconates, which is applied in the field of multi-level porous rare earth zirconate porous ceramics and its preparation, which can solve the problems of complex synthesis system, various influencing factors, cumbersome operation, etc., and achieve high mechanical properties and simple process , the effect of high specific surface area

Active Publication Date: 2012-08-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The synthesis of hierarchical porous materials is often a combination of different synthesis methods, which determines that there are many problems in the synthesis of hierarchical porous materials, such as complex synthesis systems, various influencing factors, high cost, and cumbersome operations.

Method used

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  • Rare earth zirconate porous ceramic with hierarchical pore structure and preparation method thereof
  • Rare earth zirconate porous ceramic with hierarchical pore structure and preparation method thereof
  • Rare earth zirconate porous ceramic with hierarchical pore structure and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] 1) Preparation of monodisperse carbon nanosphere template: 60g of glucose was dissolved in 900mL of deionized water, stirred to a clear solution, and then transferred to a 1000mL hydrothermal reaction kettle. 160°C, 900r / min rotation speed, hydrothermal reaction for 6h. The obtained precursor solution was centrifuged, washed with water and washed with alcohol three times, and then dried in a vacuum oven at 60°C for 12 hours to prepare C balls.

[0035] 2) Preparation of CSGd with core-shell structure 2 Zr 2 o 7 Nano-encapsulated powder: Take 0.1g of dried C balls, dissolve them in 100mL of absolute ethanol, ultrasonicate for 30min, and fully disperse the C balls in absolute ethanol to obtain A suspension. Weigh 0.003 mol of gadolinium nitrate, 0.003 mol of zirconium oxychloride and 0.02 mol of urea, dissolve them in 100 mL of absolute ethanol, stir until the solution is clear, and obtain B solution. After mixing the A suspension and the B solution, sonicate for 30 m...

Embodiment 2

[0040] 1) Preparation of monodisperse carbon nanosphere template: 90g of glucose was dissolved in 900mL of deionized water, stirred to a clear solution, and then transferred to a 1000mL hydrothermal reaction kettle. 170°C, 900r / min speed, water heating for 3h. The obtained precursor solution was centrifuged, washed with water and washed with alcohol three times, and then dried in a vacuum oven at 60°C for 12 hours to prepare C balls.

[0041] 2) Preparation of CSYb with core-shell structure 2 Zr 2 o 7 Nano-encapsulated powder: Take 0.1g of dried C balls, dissolve them in 100mL of absolute ethanol, ultrasonicate for 30min, and fully disperse the C balls in absolute ethanol to obtain A suspension. Weigh 0.003mol of ytterbium nitrate, 0.003mol of zirconium oxychloride and 0.02mol of urea, dissolve them in 100mL of absolute ethanol, stir until the solution is clear, and obtain solution B. After mixing the suspension of A and the solution of B, sonicate for 30 minutes, and then...

Embodiment 3

[0046] 1) Preparation of monodisperse carbon nanosphere template: 90g of glucose was dissolved in 900mL of deionized water, stirred to a clear solution, and then transferred to a 1000mL hydrothermal reaction kettle. 170°C, 900r / min speed, water heating for 3h. The obtained precursor solution was centrifuged, washed with water and washed with alcohol three times, and then dried in a vacuum oven at 60°C for 12 hours to prepare C balls.

[0047] 2) Preparation of CSSm with core-shell structure 2 Zr 2 o 7 Nano-encapsulated powder: Take 0.2g of dried C balls, dissolve them in 100mL of absolute ethanol, ultrasonicate for 30min, and fully disperse the C balls in absolute ethanol to obtain A suspension. Weigh 0.003 mol of samarium nitrate, 0.003 mol of zirconium oxychloride and 0.03 mol of urea, dissolve them in 100 mL of absolute ethanol, stir until the solution is clear, and obtain B solution. After mixing the A suspension and the B solution, sonicate for 30 minutes, and then pu...

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Abstract

The invention discloses a rare earth zirconate porous ceramic with a hierarchical pore structure and a preparation method thereof. The preparation method of the porous ceramic comprises the following steps of: 1, preparing CS @ Ln2Zr2O7 nano coating powder with a core-shell structure; 2, preparing the CS @ Ln2Zr2O7 nano coating powder into a blank; 3, heating the blank to 1100-1600 DEG C at the speed of 2-5 DEG C / min and sintering; and finally taking out a block obtained after sintering, carrying out heat treatment on the block in an air atmosphere at 700-1000 DEG C to remove nano carbon balls so as to obtain rare earth zirconate porous ceramic with a hierarchical pore structure, which has the advantage of high specific surface area, high thermostability and high mechanical performance, wherein the porosity is high up to 85-92%, the specific surface area is high up to 450m<2> / g, and the compression strength is higher than 20MPa. The rare earth zirconate porous ceramic has wide positional application in the fields such as catalyst supports, filters, nanoreactor and fuel cells.

Description

technical field [0001] The invention relates to a rare earth zirconate porous ceramic with hierarchical pore structure and a preparation method thereof. Background technique [0002] Porous ceramics not only have the characteristics of good chemical stability, oxidation resistance, high temperature resistance and corrosion resistance of ordinary ceramics, but also have the advantages of low density, large specific surface area and low thermal conductivity due to their pore structure. , chemical industry and other fields are widely used. Porous solid materials can be divided into three types according to the pore size: microporous materials with a pore size smaller than 2 nm; mesoporous materials with a pore size between 2 and 50 nm; and macroporous materials with a pore size larger than 50 nm. Among them, macroporous ceramics are mainly used as structural materials, such as the thermal protection structure of spacecraft, while mesoporous and microporous ceramics are mainly ...

Claims

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Application Information

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IPC IPC(8): C04B38/06C04B35/58C04B35/622
Inventor 汪长安李洒刘凯
Owner TSINGHUA UNIV
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