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Porous cordierite ceramic prepared by taking walnut hull powder as pore former

A technology of walnut skin powder and porous ceramics, which is applied in the field of preparation of porous cordierite ceramics, can solve the problems of no relevant reports on porous ceramics, lack of research on pore size and distribution, etc., and achieves good ceramic quality, complete decomposition, and high decomposition temperature. Effect

Inactive Publication Date: 2015-03-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above studies have prepared and characterized porous cordierite ceramics, focusing on the improvement of porosity and mechanical properties, but lack of research on pore size and distribution
And there is no relevant report on the method of preparing porous ceramics with walnut peel powder as pore-forming agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a. Design the total amount of raw materials according to the size and quantity of the prepared ceramics. According to the weight percentage of ceramic raw materials, talc 36%, kaolin 18%, calcined kaolin 23%, alumina 5%, aluminum hydroxide 10%, silicon dioxide 3%, MC5% Mix and grind the raw materials evenly until the particle size is less than 250 mesh;

[0027] B, the walnut peel powder is pulverized, and ball milled to a particle size of 1000-1200 mesh:;

[0028] c. According to the weight percentage of the porous ceramic mixture, the raw material and the pore-forming agent are evenly mixed;

[0029] d. Put the mixed material into the porcelain blank mold for molding, the molding pressure is 200MPa, hold the pressure for 45s, then withdraw the mold, and let it dry naturally for 12h;

[0030] e. Put the formed green body into the kiln, adopt gradient heating, and the heating program is as follows: the highest sintering temperature is 1380°C, the heating rate is 1.5°C / ...

Embodiment 2

[0033] a. Design the total amount of raw materials according to the size and quantity of the prepared ceramics. According to the weight percentage of ceramic raw materials, 38% of talc, 17% of kaolin, 22% of calcined kaolin, 5% of alumina, 10% of aluminum hydroxide, 3% of silicon dioxide, MC5%. Mix and grind the raw materials evenly until the particle size is less than 250 mesh;

[0034] B, the walnut peel powder is pulverized, and ball milled to a particle size of 1000-1200 mesh:;

[0035] c. According to the weight percentage of the porous ceramic mixture, the raw material and the pore-forming agent are evenly mixed;

[0036] d. Put the mixed material into the porcelain blank mold for molding, the molding pressure is 200MPa, hold the pressure for 45s, then withdraw the mold, and let it dry naturally for 12h;

[0037] e. Put the formed green body into the kiln, adopt gradient heating, and the heating program is as follows: the highest sintering temperature is 1380°C, the he...

Embodiment 3

[0040] a. Design the total amount of raw materials according to the size and quantity of the prepared ceramics. According to the weight percentage of ceramic raw materials, talc 35%, kaolin 19%, calcined kaolin 23%, alumina 5%, aluminum hydroxide 10%, silicon dioxide 3%, MC5%. Mix and grind the raw materials evenly until the particle size is less than 250 mesh;

[0041] B, the walnut peel powder is pulverized, and ball milled to a particle size of 1000-1200 mesh:;

[0042] c. According to the weight percentage of the porous ceramic mixture, the raw material and the pore-forming agent are evenly mixed;

[0043] d. Put the mixed material into the porcelain blank mold for molding, the molding pressure is 200MPa, hold the pressure for 45s, then withdraw the mold, and let it dry naturally for 12h;

[0044]e. Put the formed green body into the kiln, adopt gradient heating, and the heating program is as follows: the highest sintering temperature is 1380°C, the heating rate is 2°C / m...

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Abstract

The invention relates to a porous cordierite ceramic prepared by taking walnut hull powder as a pore former. The ceramic is prepared by mixing and grinding talcum, kaoline, calcined kaoline, alumina, aluminum hydroxide, quartz and MC (Methyl Cellulose) By weight percentage, putting into a body mold for forming, drying a formed body, roasting, and holding the temperature for a certain time. A method is used for the porous cordierite ceramic prepared by taking the walnut hull powder as the pore former; the ceramic meeting national standard requirements is obtained; at the same time, apparent porosity of the ceramic reaches above 50%; a pore size reaches about 2.5 micrometers; a pore size scope is 2.0-3.0 micrometers; and the pore distribution is uniform, so that PM2.5 (Particulate Matter 2.5) in gas is absorbed to achieve an effect of purifying air. A walnut hull has a higher decomposition temperature which is matched with a ceramic forming temperature of the cordierite ceramic, so that uniform pores can be formed in the ceramic body more easily; compared with an inorganic pore former, the walnut hull is decomposed more completely without any impurities, and a cordierite pure phase of the ceramic is unaffected.

Description

technical field [0001] The invention relates to the preparation of porous cordierite ceramics, a green and environment-friendly material prepared by using walnut peel powder as a pore-forming agent and a preparation method. Background technique [0002] In recent years, the pollution of air pollutant PM2.5 has become increasingly serious. PM2.5 represents the content of respirable lung particles per cubic meter of air, and its diameter is less than or equal to 2.5 microns. PM2.5 mostly contains toxic substances such as heavy metals, which have a great impact on human health and the quality of the atmospheric environment. Air pollution is a problem that needs to be solved urgently. The current research on cordierite porous ceramics is mainly aimed at increasing the porosity and requiring less pore size. The pore-forming agents used are starch, urea, calcium carbonate, etc. Due to its high decomposition temperature, walnut skin is relatively close to the porcelain-forming te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B35/185
Inventor 张培萍代昶孙倩颖孙佳奕暴营张璇
Owner JILIN UNIV
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