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Method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method

A preform, porous ceramic technology, applied in ceramic products, applications, household appliances, etc., can solve the problem of difficult to meet the performance requirements of alumina porous ceramic filter elements, and achieve strong thermal shock resistance, high strength, and yield. high effect

Inactive Publication Date: 2005-06-22
SHANDONG UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0002] The traditional preparation technology of alumina porous ceramic filter element is to produce pores on the ceramic substrate, and often reduce the firing temperature of the green body to increase the porosity of the element. The porosity and strength of alumina porous ceramics have always been relative. Contradictory, often in production and application, especially the products of traditional production technology are difficult to meet the performance requirements of alumina porous ceramic filter elements in high temperature flue gas filtration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] ① Mud preparation:

[0013] Industrial alumina powder (75 μm) 76wt%, Jiexiu soil 7wt%, Datong soil 6wt%, aluminum titanate 10wt%, sodium carbonate 1wt%;

[0014] The above raw materials were mixed with water, and ground in a ball mill for 72 hours to prepare a slurry with a fineness of 15 μm, which was then milled for use.

[0015] ② Preform preparation process: polycrystalline Al with a length of 1-60mm 2 o 3 Preparation of fluid polycrystalline Al by adding binder and water to ceramic fibers 2 o 3 Ceramic fiber slurry, its mass percentage: polycrystalline Al 2 o 3 Ceramic fiber 32wt%, binder 5wt%, water 63wt%, use a large-hole mold to take shape, and dry naturally or oven electric heat to obtain polycrystalline Al 2 o 3 Ceramic fiber preforms.

[0016] ③Body molding process: using suction filtration molding technology, mixing mud, pore-forming agent, and citric acid according to the mass percentage of 94wt%: 5wt%: 1wt%, vacuuming, injecting into the preform in...

Embodiment 2

[0020] Industrial alumina powder (75 μm) 75wt%, Jiexiu soil 7wt%, Datong soil 8wt%, aluminum titanate 9wt%, sodium carbonate 1wt%;

Embodiment 3

[0022] Industrial alumina powder (75 μm) 78wt%, Jiexiu soil 6wt%, Datong soil 5wt%, aluminum titanate 10wt%, sodium carbonate 1wt%;

[0023] The preparation process of Examples 2 and 3 is basically the same as that of Example 1. The technical indicators of the prepared products are: average strength 36 MPa, average porosity 40%, and pore diameters of 3 and 1 μm respectively.

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Abstract

The invention provides a method for preparing porous ceramic by polycrystalline Al#-[2]O#-[3] fiber preforming method which comprises, (1) mixing aluminium oxide powder, clay, high temperature bonding agent, slurry additive by the mass ratio of 70-80, 10-15, 4-19, 1-2 with water, ball grinding to prepare slurry, then mixing slurry, dispergator and pore forming agent to prepare filled slurry, (2) short cutting the polycrystalline Al2O3 ceramic fiber, mixing and dispersing in water, charging binding agent to prepare fabric paste, (3) injecting the fabric paste into die to obtain pre-shaped body and drying, (4) placing the dried pre-shaped body into gypsum die, then injecting into filling slurry and evacuating, (5) subjecting the pre-shaped body filled with slurry to drying and high temperature sintering.

Description

Technical field [0001] The invention relates to a polycrystalline Al 2 o 3 The invention relates to a method for preparing porous ceramics by a fiber preform method, which belongs to the technical field of porous ceramics preparation technology. Background technique [0002] The traditional preparation technology of alumina porous ceramic filter element is to produce pores on the ceramic substrate, and often reduce the firing temperature of the green body to increase the porosity of the element. The porosity and strength of alumina porous ceramics have always been relative. Contradictory, often in production and application, especially the products of traditional production technology are difficult to meet the performance requirements of alumina porous ceramic filter elements in high temperature flue gas filtration. Contents of the invention [0003] The problem to be solved by the present invention is to provide a method of compounding polycrystalline alumina ceramic fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/622C04B35/80C04B38/00C04B38/06
Inventor 任京成田贵山唐竹兴许珂敬孟凡涛魏春城
Owner SHANDONG UNIV OF TECH
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