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Oxidation of diamond windows

Published online by Cambridge University Press:  03 March 2011

Curtis E. Johnson ,
Jean M. Bennett  and
Melvin P. Nadler
Curtis E. Johnson
Affiliation:
Chemistry and Materials Branch, Research and Technology Division, Naval Air Warfare Center Weapons Division, China Lake, California 93555-6001
Jean M. Bennett
Affiliation:
Physics Branch, Research and Technology Division, Naval Air Warfare Center Weapons Division, China Lake, California 93555-6001
Melvin P. Nadler
Affiliation:
Chemistry and Materials Branch, Research and Technology Division, Naval Air Warfare Center Weapons Division, China Lake, California 93555-6001
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Abstract

Diamond windows were heated at 700-900 °C in air for short times to better define the limits of application at high temperature. The infrared (IR) transmission of polished chemical vapor deposition (CVD) diamond windows was reduced after heating in a furnace at 800 °C for 75 s, while heating at 700 °C for 75 s produced little change. The 800 °C heating caused increased visible light scatter, and increased scatter appears to be mainly responsible for the reduced IR transmission. The forward scatter at 10.6 μm for the CVD diamond samples was 0.8% before heating, 2.8% after heating at 800 °C for 75 s, and 6.2% after heating at 800 °C for 255 s. Single crystal (110) type IIa diamond exhibited little change in IR transmission when heated at 800 °C in air for 255 s, while heating for 555 s at 800 °C caused a significant drop in IR transmittance (6-12%). A slight drop in IR transmittance (1-5%) occurred for a type IIa diamond when heated at 900 °C for 45 s. The etched surfaces were characterized by differential interference contrast optical microscopy, scanning electron microscopy, and Talystep surface profiles. Etched features are concentrated at grain boundaries (for the CVD samples) and at sites with residual damage from mechanical polishing that could not be seen before the heat treatment. Deep etch pits formed at grain boundaries that extend into the bulk of samples.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 10 , October 1995 , pp. 2555 - 2563
Copyright
Copyright © Materials Research Society 1995

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References

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