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High-porosity mullite whisker porous ceramic tube and preparing method

A technology of mullite whisker and high porosity, which is applied in the field of mullite whisker porous ceramic tube and its preparation, can solve the problems of powder agglomeration, low porosity of green mullite whisker, etc. Reduced aggregate agglomeration and uniform slurry

Inactive Publication Date: 2018-07-10
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of porous mullite whiskers by traditional compression molding method is not conducive to the uniform and in-situ free growth of mullite whiskers due to serious powder agglomeration and low porosity of the green body.

Method used

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  • High-porosity mullite whisker porous ceramic tube and preparing method
  • High-porosity mullite whisker porous ceramic tube and preparing method
  • High-porosity mullite whisker porous ceramic tube and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: with kaolin and Al(OH) 3 Preparation of mullite whisker ceramic tube as raw material and ammonium tungstate as catalyst

[0024] First, 20% binder PESF and 3% plasticizer PVP are dissolved in 30g NMP solution until the dissolution is complete; then, 45g kaolin, Al(OH) 3 Mix the powder with ammonium tungstate, after adding the powder each time, after ball milling for 5 hours, add again, the mass ratio of the materials in the mixed powder is based on the chemical formula (3Al 2 o 3 2SiO2 2 ) 0.8 (WO 3 ) 0.2 Calculation: After all the powders are added, ball mill for 24 hours to obtain a ceramic casting solution with certain fluidity.

[0025] Inject the casting liquid into the ceramic tube forming device (see utility model patent 204699591U for the forming device), and use the device to extrude, so that the casting liquid contacts with the flocculant water and solidifies due to the phase inversion process; then, soak in the flocculant for 24 hours , t...

Embodiment 2

[0031] Embodiment 2: with coal gangue and Al(OH) 3 as raw material, AlF 3 Fabrication of Mullite Whisker Ceramic Tubes for Catalysts

[0032] First, dissolve ~20% binder PESF and ~3% plasticizer PVP in ~30g NMP solution until the dissolution is complete; then, add ~45g coal gangue, Al(OH) 3 and AlF 3 Mix the powder, after adding the powder each time, after ball milling for 5 hours, add again, the mass ratio of the materials in the mixed powder is based on the chemical formula 3Al 2 o 3 2SiO2 2 and 3-10wt% AlF 3 Catalyst content calculation; after all powders are added, ball mill for 24-48 hours to obtain ceramic casting liquid with certain fluidity.

[0033] Inject the casting liquid into the ceramic tube forming device (see utility model patent 204699591U for the forming device), and use the device to extrude, so that the casting liquid contacts with the flocculant water and solidifies due to the phase inversion process; then, soak in the flocculant for 24 hours As abo...

Embodiment 3

[0034] Embodiment 3: with fly ash and Al(OH) 3 as raw material, AlF 3 Fabrication of Mullite Whisker Ceramic Tubes for Catalysts

[0035] First, dissolve ~20% binder PESF and ~3% plasticizer PVP in ~30g NMP solution until the dissolution is complete; then, add ~45g fly ash, Al(OH) 3 and AlF 3 Mix the powder, after adding the powder each time, after ball milling for 5 hours, add again, the mass ratio of the materials in the mixed powder is based on the chemical formula 3Al 2 o 3 2SiO2 2 and 3-10wt% AlF 3 Catalyst content calculation; after all powders are added, ball mill for 24-48 hours to obtain ceramic casting liquid with certain fluidity.

[0036] Inject the casting liquid into the ceramic tube forming device (see utility model patent 204699591U for the forming device), and use the device to extrude, so that the casting liquid contacts with the flocculant water and solidifies due to the phase inversion process; then, soak in the flocculant for 24 hours As above, the ...

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Abstract

The invention discloses a high-porosity porous ceramic tube formed by interlocking uniform mullite whiskers and a preparing method of the ceramic tube. Three types of powder including an aluminum source, a silicon source and a whisker growth catalyst are evenly mixed and then dispersed in an organic solution which is obtained by dissolving PESF and PVP in an NMP solvent, the liquid is mixed and ball-milled evenly and then placed in a die for extrusion phase conversion forming, and a ceramic tube blank is obtained. The blank is sintered at the temperature of 1300-1500 DEG C, the whiskers grow in situ and form an interlocked structure, and therefore the high-porosity mullite whisker porous ceramic tube with the porosity larger than 70% and the breaking strength larger than about 3 MPa is obtained. The mullite whisker porous ceramic tube can be applied in the fields of thermal insulation and preservation, noise reduction, catalyst carrier and gas-solid separation and the like.

Description

technical field [0001] The invention belongs to the technical field of porous ceramics and preparation, and in particular relates to a mullite whisker porous ceramic tube and a preparation method thereof. Background technique [0002] Porous mullite ceramics have good chemical stability, low thermal conductivity and thermal expansion coefficient, and good thermal shock resistance, and have attracted widespread attention in recent years. Porous mullite ceramics have great application value in thermal insulation, noise reduction, catalyst carrier and separation and purification. Mullite crystals have anisotropic growth characteristics, and it is easy to grow into one-dimensional nano-whiskers in the presence of catalysts. This feature can effectively inhibit ceramic sintering shrinkage during in-situ reaction preparation of porous mullite ceramics, and is beneficial to the preparation of high-porosity mullite ceramics. Therefore, mullite ceramics with whisker interlocking st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B35/81C04B38/00C04B38/06
CPCC04B35/185C04B35/803C04B38/067C04B2235/326C04B2235/445C04B2235/96C04B38/0025C04B38/0058C04B38/0074
Inventor 朱志文
Owner QILU UNIV OF TECH
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