Acoustic microscopy for evaluating cracks produced by CO2 laser shaping of thin alumina plates

Chiaki Miyasaka, Mustafa Aslan, Bernhard R. Tittmann

Research output: Contribution to journalConference article

Abstract

The shaping of thin alumina ceramic plates with lasers appears to be an advantageous method for manufacturing. Unfortunately the failure rate is high because of crack initiation during the application of the high power laser. We have begun to address the issue of crack initiation by the use of in-process and post-process analysis. Here we present our results on the evaluation of cracks by optical, scanning laser, scanning electron and scanning acoustic microscopy. We present images of surface and subsurface micro-cracks generated at different power levels of our high power CO2 laser system. The spatial variation of the Rayleigh wave velocity is measured by the V(z) curve technique. These preliminary data suggest that with improvement the V(z) technique may provide residual stress variation with high spatial resolution. The evaluation described should lead to insight into the fracture mechanism and eventually provide guidance for the choice of laser parameters (e.g., power, focus, scanning rate, emitting duration, or the like).

Original languageEnglish (US)
Pages (from-to)216-225
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3396
DOIs
StatePublished - Dec 1 1998
EventNondestructive Evaluation of Materials and Composites II - San Antonio, TX, United States
Duration: Mar 31 1998Apr 1 1998

Fingerprint

CO2 Laser
Alumina
Aluminum Oxide
Microscopy
Scanning
Acoustics
Crack
Crack Initiation
cracks
aluminum oxides
High Power Laser
High power lasers
microscopy
Cracks
Crack initiation
scanning
acoustics
Lasers
crack initiation
high power lasers

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

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abstract = "The shaping of thin alumina ceramic plates with lasers appears to be an advantageous method for manufacturing. Unfortunately the failure rate is high because of crack initiation during the application of the high power laser. We have begun to address the issue of crack initiation by the use of in-process and post-process analysis. Here we present our results on the evaluation of cracks by optical, scanning laser, scanning electron and scanning acoustic microscopy. We present images of surface and subsurface micro-cracks generated at different power levels of our high power CO2 laser system. The spatial variation of the Rayleigh wave velocity is measured by the V(z) curve technique. These preliminary data suggest that with improvement the V(z) technique may provide residual stress variation with high spatial resolution. The evaluation described should lead to insight into the fracture mechanism and eventually provide guidance for the choice of laser parameters (e.g., power, focus, scanning rate, emitting duration, or the like).",
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Acoustic microscopy for evaluating cracks produced by CO2 laser shaping of thin alumina plates. / Miyasaka, Chiaki; Aslan, Mustafa; Tittmann, Bernhard R.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 3396, 01.12.1998, p. 216-225.

Research output: Contribution to journalConference article

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