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Experiences with Sol-Gel Bonded High Porosity Alumina Fiber Materials for Filter Applications

Published online by Cambridge University Press:  25 February 2011

Karin E. Handrick ,
August Mohlratzer ,
Rolf Ostertag ,
Dieter Sporn  and
Helmut Schmidt
Karin E. Handrick
Affiliation:
MAN Technologie GmbH, Dachauer Str. 667, 8000 München 50, West Germany
August Mohlratzer
Affiliation:
MAN Technologie GmbH, Dachauer Str. 667, 8000 München 50, West Germany
Rolf Ostertag
Affiliation:
Fraunhofer Institut für Silicatforschung, Neunerplatz 2, 8700 Würzburg, West Germany
Dieter Sporn
Affiliation:
Fraunhofer Institut für Silicatforschung, Neunerplatz 2, 8700 Würzburg, West Germany
Helmut Schmidt
Affiliation:
Fraunhofer Institut für Silicatforschung, Neunerplatz 2, 8700 Würzburg, West Germany
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Abstract

High porous alumina fiber structures appear promising for hot gas filtration in particular for diesel particulate traps. For this purpose, however, a method is required for manufacturing of stable shapes resistant to the blow-out by the gas flow. The sol-gel-process was expected to be the best suited method for fiber bonding to provide the required stability.

The main tasks of the development-work were a uniform isotropie fiber-distribution, the adaptation of the sol-gel-process to the application, and the deliberate synthesis of the gel-derived alumina bonding phase.

The appropriate fibrous structure was obtained by a repeated filtration of sol/fiber suspensions. The properties of the ceramic binder were adapted by concentrating the sol and/or adding aluminas or aluminium hydroxides.

Testing of prototypes with optimized structures has shown, however, that the stability of the structure decreased after thermal load. The thermal fatigue of x-A12O3 is assumed to be responsible for this failure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 121: Symposium H – Better Ceramics Through Chemistry III , 1988 , 611
Copyright
Copyright © Materials Research Society 1988

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References

REFERENCES

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