Alumina fiber-reinforced porous ceramic product and method for manufacturing product by using silt

A technology of alumina fiber and porous ceramics, which is applied in the field of ceramic products, can solve the problems of low toughness, limited application range of materials, and high brittleness of porous ceramic materials, and achieves low density, major economic and social benefits, and the effect of improving strength.

Inactive Publication Date: 2011-01-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porous ceramic materials generally have the disadvantages of low toughness, hi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] Select sludge 30%, alumina content 14%, silicon oxide content 71% slag 20%, 20% tremolite, 4% limestone, 26% clay, crush and mix, ball mill for 20 hours, add 0.5% alumina fiber Then continue to stir for 8 minutes, after drying, granulating, aging, and firing at 1160°C, and then cold working to make 800×800×30mm flat ceramic material products. The bulk density of the product is 0.6g / cm3, the flexural strength is 7.5MPa, and it is frozen and thawed in water at -20℃~20℃ for 3 hours, 5 times without damage, which proves its excellent frost resistance.

Example Embodiment

[0022] Example 2

[0023] Select 30% sludge, 14% alumina and 71% silica slag 20%, 20% tremolite, 4% limestone, 26% clay, crush and mix, ball mill for 20 hours, add 4% alumina fiber Then continue to stir for 8 minutes, after drying, granulating, aging, and firing at 1160°C, and then cold working to make 800×800×30mm flat ceramic material products. The bulk density of the product is 0.6g / cm3, the flexural strength is 12MPa, and it is frozen and thawed in water at -20℃~20℃ for 6 hours, 10 cycles, without damage, which proves its excellent frost resistance.

Example Embodiment

[0024] Example 3

[0025] Select 38% sludge, 14% alumina and 71% silica slag 25%, 15% tremolite, 4% limestone, 16% clay, crush and mix, ball mill for 20 hours, add 1.0% alumina fiber Then continue to stir for 8 minutes, after drying, granulating, aging, and firing at 1160°C, and then cold working to make 800×800×30mm flat ceramic material products. The bulk density of the product is 0.65g / cm3, the flexural strength is 8.5MPa, and it is frozen and thawed in water at -20℃~20℃ for 3 hours, 5 times without damage, which proves its excellent frost resistance.

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PUM

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Abstract

The invention discloses an alumina fiber-reinforced porous ceramic product and a method for manufacturing the product by using silt. The alumina fiber-reinforced porous ceramic product comprises an alumina fiber-reinforced porous ceramic material comprises the following components in percentage by weight: 30 to 38 percent of silt, 20 to 28 percent of slag, 40 to 49 percent of an expansion component and 0.1 to 5 percent of alumina fibers. The preparation method of the material comprises: crushing, mixing and ball milling the silt, slag and expansion component; adding the alumina fibers into the mixture, and continuing stirring; granulating by spraying; and filling fusty sludge in a mold and firing to obtain the light fiber-reinforced porous ceramic product having uniform closed micropores. In the invention, the strength and porosity of the material are improved obviously, the density of the material is lowered, the environment pollution problem of the silt is solved, recycling comprehensive use is realized, and great economic and social benefit is created.

Description

technical field [0001] The invention relates to a ceramic product, in particular to an aluminum oxide fiber reinforced porous ceramic product and a method for preparing the product from sludge. Background technique [0002] Patent No. CN200410026753.6 discloses a method for preparing light-weight ceramic plates, adding puffed stone powder with an ignition loss of 10% to 15% to the mineral raw materials to form pores inside the adobe, and the density is 0.7-15%. 0.9g / cm3 lightweight material. However, porous ceramic materials generally have the disadvantages of low toughness, high brittleness, and easy cracking, which limit the application range of such materials. The removal of lake silt is an important environmental problem faced by our country. The total amount of silt in the Taihu Lake system in Yixing alone is 220 million m3, and it is very difficult to use it as a resource. Contents of the invention [0003] The object of the present invention is to provide an alumi...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/622
Inventor 赖建中崔崇陈光张士华彭东文石晓琴
Owner NANJING UNIV OF SCI & TECH
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