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Method for preparing recrystallized SIC high temperature gas filter element

A high-temperature gas filtration and recrystallization technology, applied in the field of porous ceramics, can solve problems such as complex process control, low load bearing capacity, and expensive production equipment, and achieve the effects of reducing filtration resistance, improving bonding strength, and preventing erosion

Inactive Publication Date: 2006-08-23
GUIZHOU NEW MATERIAL MINING DEV
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Problems solved by technology

Porous filter elements prepared by a new generation of CVD and CVI processes have higher specific strength, improve the brittleness of ordinary ceramics, are light in weight, have good thermal shock resistance, and have low filtration resistance, but they also have the problem of low load bearing capacity, and Expensive production equipment and complex process control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0048] The implementation and results are further illustrated by the following example:

[0049] D. 50 SiC coarse particles of 40 μm and SiC fine particles with a particle size distribution of 1-10 μm, the ratio of the two is 7:3, adding 1% polyvinyl alcohol and 0.2% polyethyleneimine, and wet milling for 1 hour to make a mixture containing A slurry with a moisture content of 36%. The slurry is sprayed and granulated to obtain particles with a particle size distribution of 0.3 to 0.09mm. Add 6% polystyrene balls with a particle size of 0.06mm, 1% glycerin and an appropriate amount of 4% polyvinyl alcohol solution and mix evenly. It was formed by isostatic pressing under 40MPa pressure, dried at 90°C for 24 hours, and kept at 2200°C for 4 hours under argon atmosphere to make a recrystallized SiC porous support with a porosity of 28%.

[0050] Prepare the coating according to the ratio of alumina, silica fume, and silica sol 10:1:1.5, and add 20% alumina fiber, 2% carboxymethy...

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Abstract

The present invention relates to preparation process of porous ceramic filter element for high temperature corrosive condition use. The preparation process features the pore creating with organic pore creating agent, spray pelletizing and isostatic pressing formation, high temperature Ar protected sintering to prepare high strength and low filtering resistance recrystallized SiC filter element support, multiple spraying of ceramic slurry with pore creating agent of different granularity to the surface of the support, and sintering to form filtering mullite coating with gradient pore distribution, adding alumina fiber into the filtering layer to raise the strength of the filtering layer and the combination between the coating and the support. The filtering element of the present invention has high mechanical strength, high heat shock resistance, high corrosion resistance, high wear resistance, high filter precision, low pressure drop and high stability.

Description

technical field [0001] The invention relates to a manufacturing method of a recrystallized SiC high-temperature gas filter element, belonging to the technical field of porous ceramics. Background technique [0002] In coal clean combustion power generation technology, high-temperature gas filter is the key component of high-efficiency, low-environmental pollution pressurized fluidized bed combined cycle and integrated coal gasification combined cycle power generation technology developed and applied by developed countries. The high-temperature gas filter element works in an oxidizing or reducing atmosphere and contains corrosive sulfides, chlorides and alkali metals. The working temperature can reach nearly 900°C and the working pressure is 1-2 MPa. The impact of mechanical force and thermal shock often lead to the damage of filter element and the decline of material performance, so the filter element is required to have high working stability and reliability. [0003] Amon...

Claims

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Application Information

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IPC IPC(8): C04B38/00B01D39/20
Inventor 金基明李筑岩金基庆
Owner GUIZHOU NEW MATERIAL MINING DEV
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