Gradient porous ceramics film and method for preparing the same

A gradient porous, ceramic membrane technology, applied in the field of porous ceramics, to achieve the effect of good application prospects

Inactive Publication Date: 2008-05-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to obtain porous ceramics with a porosity greater than 80%, ...

Method used

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  • Gradient porous ceramics film and method for preparing the same

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Effect test

Embodiment 1

[0017] Put 50g of zirconia ball mill in the ball mill pot, add 27.75g of water, 0.05g of ammonium polyacrylate and 5g of titanium dioxide powder for pre-ball milling, after ball milling for 24 hours, add 15g of polyvinyl alcohol aqueous solution with a concentration of 10wt%, and polyethylene Diol 2.25g, carry out secondary ball milling, the ball milling time is 24h, vacuum pump the ball milled slurry, and then cast on the metal substrate, the scraper height is 0.5mm, put the sample together with the substrate into the low temperature refrigerator Freeze in a freezer for 12 hours, then quickly transfer to a freeze dryer for vacuum drying, and dry at 50°C and 5Pa for 24 hours, and obtain a porous body after sublimation of ice crystals. The freeze-dried green body was placed in a muffle furnace, heated to 600°C at a rate of 2°C / min in an air atmosphere, kept at a temperature of 1h, and plastic ejected, and then kept at a rate of 5°C / min to 1000°C for 1h. Then it was cooled with ...

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Abstract

The invention relates to a gradient porous ceramic film, the pore diameter size of which is 0.1 micron to 100 microns, the pore rate is 20 percent to 90 percent, and the pores are arranged directionally. The pore has the characteristic of the directional opening communication, and the pore diameters have gradient change along the direction of the thickness. A preparation method is processing for ball milling and mixing according to the weigh ratio of 0.1 to 0.8 portions to 0.2 to 8.0 portions to 0.001 to 0.1 portion to 0.05 to 0.5 portion to 0.05 to 0.8 portion of ceramic powder to deionized water to ammonium polyacrylate to polyvinyl alcohol to polyethylene glycol to obtain slurry for vacuum foam-removal and tape casting at a metal underlay, and a scraper is used for controlling the thickness of the film. A cast film is frozen under low temperature, dried in vacuum, debonded and sintered to obtain the controllable gradient porous ceramic film with high pore rate, which is hopeful for the good application prospect at the fields of a catalyst carrier, a grade absorption catalyzing film, a filter part etc.

Description

technical field [0001] The invention relates to a gradient porous ceramic membrane and a preparation method thereof, more precisely, a porous ceramic membrane with an open directional pore structure, a high porosity and a gradient change of the pore diameter in the membrane thickness direction is prepared by using a casting method combined with a freeze-drying process The preparation method belongs to the field of porous ceramics. Background technique [0002] Due to the advantages of chemical corrosion resistance, wear resistance, high temperature resistance, light weight, high permeability, and large specific surface area, porous ceramic materials are widely used in the fields of normal temperature and high temperature filter devices, catalyst carriers, and inorganic reaction separation devices. prospect. There are many reports about the preparation method of porous ceramics. For example, Fang Xudong et al. (Chinese Patent, Patent No. 200410041065) used 2 o 3 As the mai...

Claims

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Application Information

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IPC IPC(8): C04B38/00C04B35/622
Inventor 曾宇平任琳琳江东亮
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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