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Ultra-low density block-shaped fully stabilized zirconia gel and preparing method thereof

A fully stable zirconia, ultra-low density technology, applied in the field of material science, can solve the problems of high porosity, unsatisfactory effect, and inability to produce low density, etc., to achieve high porosity, excellent thermal stability, and microstructure units controllable effect

Active Publication Date: 2013-06-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the airgel is prepared according to the normal pressure drying method of the above-mentioned published patent, and the effect is not ideal, and a block-like zirconia airgel material with low density and high porosity cannot be prepared.
At present, there are no literature reports and patent applications on the preparation of ultra-low density bulk fully stabilized zirconia (FSZ) aerogels by adding propylene oxide method

Method used

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  • Ultra-low density block-shaped fully stabilized zirconia gel and preparing method thereof
  • Ultra-low density block-shaped fully stabilized zirconia gel and preparing method thereof
  • Ultra-low density block-shaped fully stabilized zirconia gel and preparing method thereof

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preparation example Construction

[0025] The preparation method of the zirconia airgel stabilized by ultra-low density bulk yttria comprises the following steps:

[0026] (1) Zirconium oxynitrate is used as the source of zirconium, and yttrium nitrate, calcium nitrate or magnesium nitrate is used as the stabilizer, wherein Y is expressed in molar percentage 2 o 3 : ZrO 2 =15-23%, CaO: ZrO 2 =10-20%, MgO:ZrO 2 =20-30%, add deionized water, seal with plastic wrap, put it on a magnetic stirrer and stir until completely dissolved, then add ethanol, continue to stir and mix evenly, the volume ratio of ethanol and deionized water is 4:1;

[0027](2) Add formamide and stir for 30 minutes; in terms of molar ratio, zirconyl nitrate: formamide = 1:1; add 1,2-propylene oxide, and stir while adding; in terms of molar ratio, zirconyl nitrate : 1,2-propylene oxide=1:3.8-1:12;

[0028] (3) Pour it into a petri dish, seal it with plastic wrap, put it in a tray, and put it in an oven at 60°C for gelation and aging proc...

Embodiment 1

[0033] (1) Add 0.92g of zirconium oxynitrate and 0.34g of yttrium nitrate hexahydrate, add 10ml of deionized water, seal it with plastic wrap, put it on a magnetic stirrer and stir until completely dissolved, then add 40ml of ethanol, continue to stir and mix evenly;

[0034] (2) Add 0.16ml formamide and stir for 30 minutes; add 3.41ml 1,2-propylene oxide and stir while adding;

[0035] (3) Pour it into a petri dish, seal it with plastic wrap, put it in a tray, and put it in an oven at 60°C for gelation and aging process to obtain a wet gel;

[0036] (4) Put the wet gel into a closed container filled with absolute ethanol, and put it in an oven at 60°C for aging for 3 days;

[0037] (5) Submerge the wet gel aged in absolute ethanol in a mixed solution of absolute ethanol and tetraethylorthosilicate with a volume ratio of 1:1, put it in an oven at 60°C for aging for 3 days, and finally use Dehydrated alcohol was aged for another 3 days to obtain the aged wet gel;

[0038] (7)...

Embodiment 2

[0040] (1) Add 2.3g of zirconyl nitrate and 0.73g of yttrium nitrate hexahydrate, add 10ml of deionized water, seal it with plastic wrap, put it on a magnetic stirrer and stir until completely dissolved, then add 40ml of ethanol, and continue to stir and mix evenly;

[0041] (2) Add 0.4ml formamide and stir for 30 minutes; add 3.41ml 1,2-propylene oxide and stir while adding;

[0042] (3) Pour it into a petri dish, seal it with plastic wrap, put it in a tray, and put it in an oven at 60°C for gelation and aging process to obtain a wet gel;

[0043] (4) Put the wet gel into a closed container filled with absolute ethanol, and put it in an oven at 60°C for aging for 3 days;

[0044] (5) Submerge the wet gel aged in absolute ethanol in a mixed solution of absolute ethanol and tetraethylorthosilicate with a volume ratio of 1:1, put it in an oven at 60°C for aging for 3 days, and finally use Dehydrated alcohol was aged for another 3 days to obtain the aged wet gel;

[0045] (7) F...

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Abstract

The invention discloses an ultra-low density block-shaped fully stabilized zirconia gel and a preparing method thereof. Zirconium oxynitrate serves as precursors, yttrium nitrate or calcium nitrate and or magnesium nitrate serves as stabilizing agents, Y203:ZrO2=17-23%, CaO:ZrO2=10-20%, ZrO2=20%-30%, 1 and 2-epoxypropane serves as gel accelerant, and preparation utilizes epoxypropane distribution droplets. The density of aerogel is set between 0.03-0.12 g / cm<3>, porosity is set between 98% and 99.5%, the average pore size is 120-210 nm, and specific surface areas are 630-650 m<2> / g. The fully stabilized zirconia gel is of the amorphous phase structure before heat treatment, and when heat treatment achieves 800-1000 DEG C, the cubic phase is formed. The ultra-low density block-shaped fully stabilized zirconia gel is used for acoustic resistance coupling material, catalytic agents, catalytic agent carriers, high-efficiency heat-insulation material, preparation of high-efficiency charging batteries, and the like.

Description

technical field [0001] The invention belongs to the technical field of material science, and in particular relates to an ultra-low-density massive fully stable zirconia airgel and a preparation method thereof. Background technique [0002] ZrO2 has unique mechanical, electrical, and optical properties, and excellent thermal stability. The melting temperature of pure ZrO2 is about 2900°C. The thermal conductivity of ZrO2 is very low, such as the thermal conductivity of cubic ZrO2 is 1.675 (100°C), 2.094 W / (m K) (1300°C). Therefore, ZrO2 has always been an important thermal barrier coating material and high temperature resistant heat insulation material. [0003] In 1931, Kistler first synthesized SiO2 airgel by sol-gel method, and proposed that oxide airgel can be used as a lightweight high-temperature refractory and heat-insulating material with excellent performance. Airgel is an ultra-light porous condensed matter with a three-dimensional network structure that uses gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02
Inventor 洪樟连沈亚妮
Owner ZHEJIANG UNIV
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