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Proceedings Paper

Correlation of strength and processing variables for optical-quality spinel
Author(s): Donald W. Roy; Stanley H. Evans
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Paper Abstract

Demands for both superior optical quality and maximum strength in Spinel (MgAl2O4) are becoming so stringent that a study has been undertaken to see if varying the processing sequence for Spinel will yield an improvement in its strength without degrading the optical quality. Current ceramic processing includes a hot press cycle followed by hot isostatic pressing to improve optical clarity. Optical fabrication follows, consisting of generation (milling), grinding and polishing. A test matrix, executed utilizing biaxial strength measurements coupled with grain size analysis, has demonstrated that if hot isostatic pressing is delayed until after generation and grinding of the substrate, a substantial increase in strength can be achieved. Knowledge gained in this experiment allows transmission and strength to be optimized to arrive at the best product for a given application.

Paper Details

Date Published: 6 December 1993
PDF: 9 pages
Proc. SPIE 2018, Passive Materials for Optical Elements II, (6 December 1993); doi: 10.1117/12.165221
Show Author Affiliations
Donald W. Roy, Alpha Optical Systems, Inc. (United States)
Stanley H. Evans, Alpha Optical Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 2018:
Passive Materials for Optical Elements II
Gary W. Wilkerson, Editor(s)

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