Low-thermal expansion infrared glass ceramics

Philip Lam

doi:10.1117/12.818979

27 April 2009 Low-thermal expansion infrared glass ceramics

Philip Lam

Proceedings Volume 7302, Window and Dome Technologies and Materials XI; 730211 (2009) https://doi.org/10.1117/12.818979
Event: SPIE Defense, Security, and Sensing, 2009, Orlando, Florida, United States

Abstract

L2 Tech, Inc. is in development of an innovative infrared-transparent glass ceramic material with low-thermal expansion (<0.5 ppm/°C) and high thermal-shock resistance to be used as windows and domes for high speed flight. The material is an inorganic, non-porous glass ceramic, characterized by crystalline phases of evenly distributed nano-crystals in a residual glass phase. The major crystalline phase is zirconium tungstate (ZrW₂O₈) which has Negative Thermal Expansion (NTE). The glass phase is the infrared-transparent germanate glass which has positive thermal expansion (PTE). Then glass ceramic material has a balanced thermal expansion of near zero. The crystal structure is cubic and the thermal expansion of the glass ceramic is isotropic or equal in all directions.

Citation Download Citation

Philip Lam "Low-thermal expansion infrared glass ceramics", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 730211 (27 April 2009); https://doi.org/10.1117/12.818979

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