Method for preparing porous ceramic support

A technology of porous ceramics and supports, used in ceramic products, final product manufacturing, fuel cell components, etc., can solve the problems of large amount of feed, only suitable for mass production, and prolong the experimental period, and achieve fast forming speed. Effect

Inactive Publication Date: 2008-11-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the gel forming method needs to use some organic drugs that are harmful to human nerves in the application process, and the initiation and control of the reaction is difficult. Currently, this method cannot be used to prepare tubular devices.
Twin-screw extruders can also be used to prepare long tubular billets, but in order to obtain high-quality billets, a series of preliminary preparations such as mud refining and aging are required, which prolongs the experimental period. Moreover, twin-screw extruders The price is expensive and the amount of feed is relatively large, so it is only suitable for mass production

Method used

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  • Method for preparing porous ceramic support
  • Method for preparing porous ceramic support

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh 15g of 3%mol yttria-stabilized zirconia (PSZ) ceramic powder in an agate mortar, then add 3g of flour to grind evenly. Weigh 0.75g polysulfone (PSF) and dissolve it in 2.25g N-methylpyrrolidone (NMP), then add it to the pretreated PSZ ceramic powder, and grind it with a mortar to obtain a muddy slurry. Evenly coat the surface of the glass rod, and then use the rolling method to roll back and forth on the glass plate for about 5 minutes. After the tube wall is uniform, soak it in pure water for 3 minutes, and then take out the glass rod to get the tube. Type green body. Finally, the obtained green body was sintered in a high-temperature furnace at 1200° C. for 4 hours to obtain a PSZ tubular porous ceramic support body with a porosity of about 74%.

[0027] In this embodiment: the weight of the pore-forming agent is 20% of the weight of the ceramic powder; the weight percentage of the molding agent, solvent, and pretreated ceramic powder is 3.57%: 10.71...

Embodiment 2

[0030] Accurately weigh 7.5g of nickel oxide (NiO) and 7.5g of 8% mol yttrium oxide stabilized zirconia (YSZ) ceramic powder in a ball mill jar, then add 1.5g of flour, then add an appropriate amount of absolute ethanol, and place in a planetary Mill on a ball mill for 1 hour, and finally dry in an oven for later use. Weigh 1.0g polyethersulfone (PES) and dissolve it in 2.5g N-methylpyrrolidone (NMP), then add it to the pretreated NiO-YSZ mixed ceramic powder, and grind it with a mortar to obtain a muddy slurry , evenly coat the slurry on the surface of the glass rod, and then use the rolling method to roll back and forth on the glass plate for about 5 minutes. After the tube wall is uniform, soak it in pure water for 10 minutes, and finally take out the glass rod A tubular green body with a wall thickness of about 1.0 mm is obtained.

[0031] In this embodiment: the weight of the pore-forming agent is 10% of the weight of the ceramic powder; the weight percentage of the mold...

Embodiment 3

[0035] First prepare the PSZ long-tube porous ceramic support with a length of about 15 cm according to the composition ratio and method of Example 1, then utilize the impregnation method to prepare a film of nickel oxide (NiO) and gadolinium-doped cerium oxide (GDC) mixture on its surface, Pre-fired at 1150°C for 4 hours to obtain a NiO-GDC anode, and then prepared a GDC film on its surface by impregnation method, and then sintered at 1450°C for 4 hours to form a GDC electrolyte layer, and finally painted on the surface of the sintered GDC electrolyte layer Barium Strontium Cobalt Iron (Ba 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3 ) cathode, and after sintering at 970°C for 2 hours, a thin-film SOFC single cell supported by PSZ porous ceramics is obtained.

[0036] The output performance of this single cell is measured by the four-electrode method. In the test, the silver wire is used as the wire, the silver paste is used as the connecting material, hydrogen saturated with water vapor a...

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Abstract

The invention discloses a method for making a porous ceramic support body. The method comprises the following steps that: (1) a step of ceramic powder pretreatment, during which, ceramic powder and a pore-forming material are evenly ground with the weight of the pore-forming material is 5 to 30 percent of that of the ceramic powder; (2) a step of slurry preparing, during which, a forming agent is dissolved in a solvent and then is added in the pretreated ceramic powder so as to be ground evenly; the forming agent is polysulfone or polyethersulfone and the solvent can dissolve the forming agent; moreover, the weight percent of the forming agent, the solvent and the pretreated ceramic powder is 1 to 15 percent : 2 to 30 percent : 55 to 97 percent; (3) a step of making green compact, during which, slurry is made into green compact and then is dipped in pure water so as to carry out forming; and (4) a step of high-temperature sintering. The method has high rate of finished products and quick making speed and can be used in the solid oxide fuel cell field.

Description

technical field [0001] The invention relates to a preparation method of porous ceramics, in particular to a preparation method of a porous ceramic support body. Background technique [0002] Solid oxide fuel cell (SOFC) is a new type of power generation device. SOFC single cell is a three-in-one structure composed of porous ceramic anode (fuel electrode), electrolyte and porous ceramic cathode (oxidant electrode). The single cell is connected by The plates are connected in series to form a battery stack, and the battery stack can supply power to the outside after being connected in series or in parallel. Among all kinds of fuel cells, solid oxide fuel cells have: ① all-solid structure, small size, convenient for large-scale design and enlargement of the structure, and no leakage of electrolyte; ② suitable for combined heat and power, and the energy utilization efficiency is as high as 85%. Above; ③The fuel gas has unique advantages such as wide application range, so it has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/01C04B35/622H01M8/023
CPCY02E60/50Y02P70/50
Inventor 金超刘江李连和
Owner SOUTH CHINA UNIV OF TECH
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