An Investigation Of Brazing Lanthana-Strengthened Yttria Infrared Dome And Window Material To Metal

E. M. Dunn; S. Kang; G. C. Wei

doi:10.1117/12.960763

11 September 1989 An Investigation Of Brazing Lanthana-Strengthened Yttria Infrared Dome And Window Material To Metal

E. M. Dunn, S. Kang, G. C. Wei

Proceedings Volume 1112, Window and Dome Technologies and Materials; (1989) https://doi.org/10.1117/12.960763
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

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.

Citation Download Citation

E. M. Dunn, S. Kang, and G. C. Wei "An Investigation Of Brazing Lanthana-Strengthened Yttria Infrared Dome And Window Material To Metal", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); https://doi.org/10.1117/12.960763

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