Examination of temperature distribution on silicon nitride engineering ceramics during fibre laser surface treatment

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Abstract

The thermal effects of fibre laser surface treatment on a Si3N4 engineering ceramic were studied using a computational finite element analysis (FEA). Temperature increases on the surface of the Si3N4 during fibre laser processing were measured using an infra-red thermometer; temperature distributions in the bulk were measured with specifically located thermocouples. A computational model by using FEA was then developed to model the flow and the distribution of the radiated heat resulting from the fibre laser treatment of the Si3N4 ceramic. By utilising data obtained from a TG-DSC analysis the FEA model predictions of the temperature distribution were used to map phase transformations and significant events occurring during the fibre laser surface treatment of the Si3N4. The TG-DSC analysis also indicated that the fibre laser surface treatment generally resulted in a phase transformation of the Si3N4 from α-phase to β-phase modification as elongated rod-like grains were found.

Research highlights
► Fibre laser surface treatment process of Si3N4 engineering ceramic was examined. ► An experimental model was verified with a computational finite element model. ► Phase transformation was then elucidated during fibre laser processing of the Si3N4. ► Extended parameters for fibre laser processing of the Si3N4 were also found.
Original languageEnglish
Pages (from-to)998–1011
Number of pages14
JournalOptics and Lasers in Engineering
Volume49
Issue number7
Early online date17 Mar 2011
DOIs
Publication statusPublished - Jul 2011

Bibliographical note

NOTICE: this is the author’s version of a work that was accepted for publication in Optics and Lasers in Engineering. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Optics and Lasers in Engineering, [[49] [7], (2011)] DOI: 10.1016/j.optlaseng.2011.01.014

© 2011, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • Fibre laser
  • Si3N4
  • Engineering ceramics
  • FEM
  • Phase transformation

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