An analysis of crack and porosity formation in laser surface treated magnesia partially stabilized zirconia (MgO-PSZ) and methods for alleviation

J. Lawrence, D. W. Evans

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Crack formation during the laser surface treatment of materials with low coefficients of thermal conductivity values, such as ceramics, is one of the most intractable problems encountered in the field of laser materials processing. Likewise, porosity formation during the laser surface treatment of ceramics presents a problematic subject. Any analysis, therefore, of these issues would be most informative. It is widely accepted that to prevent cracking in ceramics during laser surface treatment some form of pre- and post-treatment heating must take place. This study examines the formation of cracks and porosities during the CO2 laser surface treatment of a magnesia partially stabilized zirconia (MgO-PSZ) ceramic when pre-treatment heating was applied externally and post treatment heating was achieved using firstly a plain diverging beam, and secondly using a diffractive optical element (DOE) to produce a "tailored" laser beam profile. The results of this study revealed that the pre-treatment heating regime and the laser beam profile played a vital role in determining the occurrence, number and scale of microcracks and porosities in the CO2 laser surface treated MgO-PSZ.

Original languageEnglish
Pages (from-to)255-271
Number of pages17
JournalLasers in Engineering
Volume17
Issue number3-4
Publication statusPublished - 6 Sep 2007
Externally publishedYes

Fingerprint

crack initiation
Magnesia
zirconium oxides
Zirconia
surface treatment
Porosity
Surface treatment
Cracks
porosity
Lasers
pretreatment
ceramics
Heating
heating
lasers
Laser beams
Laser materials processing
laser beams
Diffractive optical elements
laser materials

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

Cite this

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abstract = "Crack formation during the laser surface treatment of materials with low coefficients of thermal conductivity values, such as ceramics, is one of the most intractable problems encountered in the field of laser materials processing. Likewise, porosity formation during the laser surface treatment of ceramics presents a problematic subject. Any analysis, therefore, of these issues would be most informative. It is widely accepted that to prevent cracking in ceramics during laser surface treatment some form of pre- and post-treatment heating must take place. This study examines the formation of cracks and porosities during the CO2 laser surface treatment of a magnesia partially stabilized zirconia (MgO-PSZ) ceramic when pre-treatment heating was applied externally and post treatment heating was achieved using firstly a plain diverging beam, and secondly using a diffractive optical element (DOE) to produce a {"}tailored{"} laser beam profile. The results of this study revealed that the pre-treatment heating regime and the laser beam profile played a vital role in determining the occurrence, number and scale of microcracks and porosities in the CO2 laser surface treated MgO-PSZ.",
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