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Method for preparing oriented porous silicon nitride ceramics based on carbon fiber serving as pore forming agent
The invention discloses a method for preparing oriented porous silicon nitride ceramics based on carbon fibers serving as a pore forming agent. The method comprises the following steps of mixing silicon nitride, carbon fibers with different lengths, a sintering aid, an organic additive and deionized water according to different solid contents, wherein the ratios of silicon nitride, the carbon fibers, the sintering aid, the organic additive and the deionized water are different; ageing for a period of time, then, placing the mixture into a press machine, and carrying out extrusion molding at different extruding speeds to obtain a green ceramic blank; and degumming the green blank, and then, sintering at the nitrogen atmosphere to finally obtain the one-dimensional oriented porous silicon nitride ceramics. In the preparation process, important structural parameters such as porosity, oriented air hole structure and aperture size in the ceramics are controlled through raw material selection and technical parameter regulation. The method disclosed by the invention has the characteristics of low cost and simple process; and the quality of ceramics is easily controlled. After being industrialized, the oriented porous silicon nitride ceramics can be directly applied to high-temperature flue gas dust removal equipment to purify the air and protect the environment so as to provide the technical assistance for the sustainable development of the national economy.
Method for preparing oriented porous silicon nitride ceramics based on carbon fiber serving as pore forming agent
The invention discloses a method for preparing oriented porous silicon nitride ceramics based on carbon fibers serving as a pore forming agent. The method comprises the following steps of mixing silicon nitride, carbon fibers with different lengths, a sintering aid, an organic additive and deionized water according to different solid contents, wherein the ratios of silicon nitride, the carbon fibers, the sintering aid, the organic additive and the deionized water are different; ageing for a period of time, then, placing the mixture into a press machine, and carrying out extrusion molding at different extruding speeds to obtain a green ceramic blank; and degumming the green blank, and then, sintering at the nitrogen atmosphere to finally obtain the one-dimensional oriented porous silicon nitride ceramics. In the preparation process, important structural parameters such as porosity, oriented air hole structure and aperture size in the ceramics are controlled through raw material selection and technical parameter regulation. The method disclosed by the invention has the characteristics of low cost and simple process; and the quality of ceramics is easily controlled. After being industrialized, the oriented porous silicon nitride ceramics can be directly applied to high-temperature flue gas dust removal equipment to purify the air and protect the environment so as to provide the technical assistance for the sustainable development of the national economy.
Method for preparing oriented porous silicon nitride ceramics based on carbon fiber serving as pore forming agent
YU FANGLI (author) / CHEN JINGHUA (author) / HAN PENGDE (author) / GUAN HAO (author) / NI SHU (author) / ZHANG CHANGSEN (author)
2015-04-22
Patent
Electronic Resource
English
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