Side-by-side comparison of erosion-resistant coatings

Daniel C. Harris

doi:10.1117/12.277054

27 June 1997 Side-by-side comparison of erosion-resistant coatings

Daniel C. Harris

Proceedings Volume 3060, Window and Dome Technologies and Materials V; (1997) https://doi.org/10.1117/12.277054
Event: AeroSense '97, 1997, Orlando, FL, United States

Abstract

Optical properties and rain and sand erosion resistance of the following infrared window materials were measured: ((1) Barr & Stroud boron phosphide coating on multispectral zinc sulfide, (2) Barr & Stroud gallium phosphide coating (with a thin outer layer of boron phosphide) on multispectral zinc sulfide, (3) Raytheon zinc sulfide coatings on multispectral zinc sulfide, (4) Texas Instruments bulk gallium phosphide, (5) polycrystalline magnesium fluoride, and (6) single-crystal silicon. ZnS-coated ZnS has low optical emission for operation at 500 degrees Celsius in both the 3 - 5 and 8 - 10 micrometer regions. Bulk GaP and bare MgF₂ have low emission only in the 3 - 5 micrometer region. BP/ZnS and BP/GaP/ZnS have prohibitive optical emission at 500 degrees Celsius in both the 3 - 5 and 8 - 10 micrometer regions. In whirling arm rain erosion experiments, none of the coated materials was as durable as bare MgF₂. BP/ZnS is more durable than ZnS/ZnS, but subsurface damage preceded damage to the BP coating in BP/ZnS. GaP fractured easily on orthogonal crystal planes upon raindrop impact. In sand erosion experiments, BP and BP/GaP/ZnS were best and MgF₂ was second most durable. A procedure is proposed for conducting comparative rain and sand erosion tests of inclined windows.

Citation Download Citation

Daniel C. Harris "Side-by-side comparison of erosion-resistant coatings", Proc. SPIE 3060, Window and Dome Technologies and Materials V, (27 June 1997); https://doi.org/10.1117/12.277054

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