EFFECT OF THERMAL CYCLING ON STRESS IN METALLIC FILMS ON CERAMIC SUBSTRATES

Edward M. Mattison, Robert F.C. Vessot

Abstract:	The hydrogen maser is the most stable frequency standard currently available for averaging intervals of hours to weeks. A major contributor to maser frequency variations is the maser's microwave resonant cavity: by means of the cavity pulling effect, a change in the cavity's resonance frequency produces a proportional change in the maser's output frequency. To minimize variations in the cavity's dimensions, and thus in its resonance frequency, maser cavities are often constructed of a low-expansivity glass-ceramic material coated on its inner surface with a conducitive metallic film. We have previously shown that silver films like those used in SAO maser cavities develop tensile stress when cooled to room temperature after being fired onto the cavity, and that the stress in such films relaxes with time at a rate proportional to the level of stress.
Published in:	Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting December 4 - 6, 1990 Sheraton Premiere Hotel Vienna, Virginia
Pages:	301 - 306
Cite this article:	Mattison, Edward M., Vessot, Robert F.C., "EFFECT OF THERMAL CYCLING ON STRESS IN METALLIC FILMS ON CERAMIC SUBSTRATES," Proceedings of the 22th Annual Precise Time and Time Interval Systems and Applications Meeting, Vienna, Virginia, December 1990, pp. 301-306.
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