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Proceedings Paper

An Investigation Of Brazing Lanthana-Strengthened Yttria Infrared Dome And Window Material To Metal
Author(s): E. M. Dunn; S. Kang; G. C. Wei
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Paper Abstract

Lanthana-strengthened yttria (LSY) is a material of great interest for infrared window and dome applications. The ability to join LSY to structural materials such as metals is essential in the construction of advanced systems. A study was undertaken to evaluate joining LSY to metal by brazing. Brazing is often the method of choice in dissimilar materials joining because of the resultant hermeticity and because of the ability of a ductile metallic braze to accommodate differential thermal expansion. The thermodynamics of the braze-LSY interface was studied, and potential chemical reactions and the adhesion mechanism were examined. Based on this, a candidate list of reactive materials for use as either coatings or alloying additions was generated. Wetting behavior and reactivity were measured using the sessile drop test. A series of brazed samples were made using coupon specimens to obtain shear test mechanical strength data for the proposed material systems. Finally, the practices developed were demonstrated with the successful brazing of a 2.8 in. diameter LSY dome to a metal ring.

Paper Details

Date Published: 11 September 1989
PDF: 13 pages
Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960763
Show Author Affiliations
E. M. Dunn, GTE Laboratories Incorporated (United States)
S. Kang, GTE Laboratories Incorporated (United States)
G. C. Wei, GTE Laboratories Incorporated (United States)

Published in SPIE Proceedings Vol. 1112:
Window and Dome Technologies and Materials
Paul Klocek, Editor(s)

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