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Mullite fiber reinforced porous ceramic product and method for preparing mullite fiber reinforced porous ceramic product from waste ceramics

A technology of mullite fiber and porous ceramics, which is applied in the field of ceramic products, can solve the problems of low toughness of porous ceramic materials, limit the application range of materials, and high brittleness, achieve low density, realize comprehensive utilization of resources, improve mechanical properties and The effect of durability

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, high brittleness, and easy cracking, which limits the application range of such materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Select waste ceramic fragments (glazed) with 22% alumina content and 68% silica content (glazed) 16%, (unglazed) 34%, tremolite 17%, dolomite 6%, pottery clay 23%, add 0.4 % silicon carbide powder, crushed and mixed, ball milled for 20 hours, added 0.5% mullite fiber and continued to stir for 8 minutes, after drying and granulating, spread the mud into a detachable refractory composite mold after aging, and burn it at 1220°C After cold processing, the bulk density of the ceramic material product is 0.6g / cm3, and the flexural strength is 7MPa. It is frozen and thawed in water at -20°C to 20°C for 3 hours, 5 cycles, and there is no damage, which proves that its frost resistance is excellent.

Embodiment 2

[0024] Select waste ceramic fragments (glazed) with 22% alumina content and 68% silica content (glazed) 16%, (unglazed) 34%, tremolite 17%, dolomite 6%, pottery clay 23%, add 0.4 % silicon carbide powder, crushed and mixed, ball milled for 20 hours, added 5% mullite fiber and continued to stir for 8 minutes, after drying and granulating, spread the mud into a detachable refractory composite mold after aging, and burn at 1220°C , The bulk density of ceramic material products after cold processing is 0.6g / cm3, and the flexural strength is 11.5MPa. They are frozen and thawed in water at -20°C to 20°C for 6 hours, and there is no damage after 10 cycles, which proves that it has excellent frost resistance.

Embodiment 3

[0026] Select waste ceramic fragments (glazed) with 22% alumina content and 68% silica content (glazed) 18%, (unglazed) 40%, tremolite 16%, dolomite 6%, pottery clay 20%, add 1.4 % silicon carbide powder, crushed and mixed, ball milled for 20 hours, added 0.5% mullite fiber and continued to stir for 8 minutes, after drying and granulating, spread the mud into a detachable refractory composite mold after aging, and burn at 1220°C , The bulk density of ceramic material products after cold processing is 0.65g / cm3, and the flexural strength is 7.8MPa. They are frozen and thawed in water at -20°C to 20°C for 6 hours, and there is no damage after 10 cycles, which proves that it has excellent frost resistance.

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Abstract

The invention discloses a mullite fiber reinforced porous ceramic product. The mullite fiber reinforced porous ceramic product comprises the following components in percentage by weight: 50 to 58 percent of waste ceramic fragment, 40 to 48 percent of foaming mineral, 0.1 to 2 percent of sintering modifier and 0.1 to 5 percent of mullite fiber. A method for preparing the mullite fiber reinforced porous ceramic product comprises the following steps of: pulverizing and mixing the waste ceramic fragment, the foaming mineral and the sintering modifier to perform ball milling; adding the mullite fiber into the mixture and continuing to stir the mixture; performing spray drying; after the mixture is staled, paving pug into a detachable fire-resistant combined mould; slicking the mould and placing the mould into a kiln; and firing to obtain the light-weight uniform and sealed micropore-containing mullite fiber reinforced ceramic product. The mullite fiber reinforced porous ceramic product andthe preparation method thereof have the advantages of improving the mechanic property and the durability of the porous ceramic material, solving the problem of environmental pollution of waste ceramics and realizing recycling comprehensive utilization, along with great economic and social benefits and the like.

Description

technical field [0001] The invention relates to a ceramic product, in particular to a mullite fiber reinforced porous ceramic product and a method for preparing the product by using waste ceramics. 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. About 5% to 10% of waste ceramics are produced in the production process of ceramic products. In Yixing alone, there are more than 30,000 tons of waste ceramics to be treated urgently every year. Contents of the invention [0003] The object of the present invention is to provide a mullite fiber reinforced p...

Claims

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Application Information

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IPC IPC(8): C04B38/02C04B35/80C04B35/622C04B35/64
Inventor 赖建中崔崇陈光张士华彭东文石晓琴
Owner NANJING UNIV OF SCI & TECH