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Proceedings Paper

Low-thermal expansion infrared glass ceramics
Author(s): Philip Lam
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Paper 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.

Paper Details

Date Published: 27 April 2009
PDF: 7 pages
Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 730211 (27 April 2009); doi: 10.1117/12.818979
Show Author Affiliations
Philip Lam, L2 Tech, Inc. (United States)


Published in SPIE Proceedings Vol. 7302:
Window and Dome Technologies and Materials XI
Randal W. Tustison, Editor(s)

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