Toughening Of Zinc Sulfide

Bhaskar S. Majumdar; Peter J. Melling

doi:10.1117/12.960766

11 September 1989 Toughening Of Zinc Sulfide

Bhaskar S. Majumdar, Peter J. Melling

Proceedings Volume 1112, Window and Dome Technologies and Materials; (1989) https://doi.org/10.1117/12.960766
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

Abstract

Although zinc sulfide has good infrared properties, it has poor fracture toughness. Thus, processing or particle-impact induced flaws can make zinc sulfide windows and domes susceptible to cracking under stresses arising from thermal or mechanical loads. An attempt was made in this program to increase the fracture toughness of zinc sulfide by adding zirconium sulfide, which is also transparent in the infrared. By adding different quantities of zirconium sulfide, it was observed that the resultant composite had a toughness that was more than double that of pure zinc sulfide processed in the same manner. More significantly, the toughness improvement was not accompanied by any strength reduction, although the strength of pure zirconium sulfide was only one-fourth that of zinc sulfide. Microstructural examination indicated toughening by crack-bridging by zirconium sulfide, that was stretched into stringers by the processing. The data and details on toughening mechanisms are presented here.

Citation Download Citation

Bhaskar S. Majumdar and Peter J. Melling "Toughening Of Zinc Sulfide", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); https://doi.org/10.1117/12.960766

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