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Ceramic honeycomb structures

A technology of honeycomb structure and ceramic honeycomb, which is applied in ceramic products, filtration and separation, household appliances, etc., and can solve problems such as poor thermal stability and poor thermal conductivity

Inactive Publication Date: 2010-12-01
IMERYS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although mullite is known to be chemically resistant to diesel exhaust, the presence of a glassy silica phase is undesirable due to its high chemical reactivity to trace components of the exhaust
In addition, although the mullite phase has a high melting point, its thermal conductivity is relatively poor
The glassy phase has poor thermal stability due to its low melting point

Method used

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Examples

Experimental program
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preparation example Construction

[0116] Preparation of raw materials:

[0117] For the application of the present invention, the solid mineral compounds (andalusite, alumina, titania, graphite, mullite, tialite, etc.) use. Corresponding preparations are commercially available and known to those skilled in the art. For example, powdered andalusite having a particle size range suitable for the present invention is available under the trade name (Damrec), powdered graphite having a particle size range suitable for the present invention can be obtained under the trade name (Timcal), powdered alumina and alumina dispersions are available from Degussa, and powdered titania and titania dispersions are available from Millennium Chemicals. Selected cuts of commercially available materials may, if desired, be obtained by techniques known in the art, such as fractionation techniques (eg, sieving).

[0118] Alternatively, mullite and tialite can be prepared by reacting appropriate mineral precursor compounds at ele...

Embodiment 1

[0166] Example 1: Preparation of Extrudable Mixtures and Ceramic Honeycomb Structures of the Invention

[0167] Step 1: Preparation of Extrudable Mixture and Extrusion Method

[0168]Mix the raw materials listed in Table 1 in a conventional mixer (Eirich mixer) to obtain an extrudable paste which can be passed through a conventional extruder (Dorst V15 or V20 extruder) equipped with a suitable die. Extruded to obtain a green honeycomb body.

[0169] Table 1: Composition of Extrudable Mixtures

[0170] raw material

FIDI 20

FIDI 23

FIDI 24

FIDI 25

％

％

Contain >10μm~55

μm of selected andalusite

Contain >20μm~55μm

selected andalusite

andalusite

53.8％

53.9％

53.9％

53.9％

graphite

15.0％

15.0％

15.0％

15.0％

Adhesive

3.0％

3.0％

3.0％

3.0％

h 2 o

4.0％

0.0％

0％

0％

Titanium Dioxide Dispersion

4.0％

12.4％

12....

Embodiment 2

[0206] Example 2: Preparation of Extrudable Mixtures of the Invention

[0207] Mix the raw materials listed in Table 4 in a conventional mixer (Eirich mixer) to obtain an extrudable paste which can be passed through a conventional extruder (Dorst V15 or V20 extruder) equipped with a suitable die Extruded to obtain a green honeycomb body.

[0208] Table 4: Composition of raw materials

[0209] raw material

FIDI 30

FIDI 30

Contain > 10μm ~ 55μm selected

andalusite

Contains > 20μm ~ 55μm

andalusite

andalusite

53.8％

53.8％

graphite

13.0％

13.0％

Adhesive

5.0％

5.0％

h 2 o

0％

0％

Titanium Dioxide Dispersion

12.4％

12.4％

Aluminum Oxide Dispersion

10.5％

10.5％

Additives (plasticizers and lubricants)

5.2％

5.2％

total:

100.00％

100.00％

[0210] Andalusite as commodity The form of KF (Damrec) is used. Graphite as a commodity The form of KS75 ...

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Abstract

The invention relates to ceramic honeycomb structures comprising a mullite phase and a tialite phase, and methods for manufacturing these honeycomb structures. The invention also relates to the use of andalusite for the manufacture of a ceramic honeycomb structure, as well as to the ceramic honeycomb structures containing andalusite, and to the methods for manufacturing these ceramic honeycomb structures.

Description

technical field [0001] The present invention relates to ceramic honeycomb structures comprising a mullite phase and a tialite phase, methods of making these honeycomb structures and applications of these structures. [0002] The present invention also relates to the use of andalusite in the manufacture of ceramic honeycomb structures, as well as ceramic honeycomb structures containing andalusite and methods of making these ceramic honeycomb structures. Background technique [0003] Ceramic honeycomb structures are well known in the art of making filters for liquid and gaseous media. Today, however, the most relevant application is the use of said ceramic bodies as particle filters for removing fine particles (diesel particulates) from the exhaust gases of diesel engines of vehicles, since these particles have been shown to have adverse effects on human health. [0004] Several ceramic materials have been described for the fabrication of ceramic honeycomb filters suitable fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/185C04B38/00F01N3/022B01D39/20
CPCC04B2235/3418C04B2235/3206C04B35/478C04B35/185C04B2235/3232C04B2235/3463C04B35/565C04B2235/3217C04B35/443Y02T10/20C04B2111/00793F01N3/0222C04B38/0009C04B2235/5436C04B2235/425Y10T428/24149Y02T10/12C04B38/0054C04B38/0058C04B38/0074C04B38/068
Inventor 让-安德烈·阿拉里
Owner IMERYS SA
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