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Characterization of High Alumina Refractory Ceramics Treated with Combined Two Laser Surface Processing

Published online by Cambridge University Press:  17 March 2011

Johanna R. Bernstein ,
Dimitris Triantafyllidis ,
Lin Li  and
F. Howard Stott
Johanna R. Bernstein
Affiliation:
Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, UK.
Dimitris Triantafyllidis
Affiliation:
Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, UK.
Lin Li
Affiliation:
Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester Institute of Science and Technology, Manchester M60 1QD, UK.
F. Howard Stott
Affiliation:
Corrosion and Protection Centre, University of Manchester Institute of Science and Technology, Manchester M60 1QD, UK.
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Abstract

Alumina-based refractory materials are extensively used in high-temperature industrial applications, such as for linings in waste and other incinerators. The existence of porosity and material inhomogeneities can promote chemical degradation due to molten slag penetration, while impacting solid or liquid feedstock can cause erosive-wear damage. Previous research has successfully used single laser energy sources to alter the surface properties of similar ceramics, with emphasis on sealing porosity and enhancing degradation resistance. However, this process has resulted in some solidification cracking at the surface due to large temperature gradients developed during processing. In the present, ongoing work, the surface of the refractory ceramic is modified by combining two laser energy sources to control the thermal gradients and cooling rates, with the objective of eliminating crack formation. The surface morphology and microstructures of the laser-treated areas are analyzed. This paper presents some initial results from the programme.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 697: Symposium P – Surface Engineering 2001--Fundamentals and Applications , January 2001 , P7.3
Copyright
Copyright © Materials Research Society 2002

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