ULTRALOW EXPANSION GLASS
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United States of America Patent
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Jul 27, 2017
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Sep 13, 2013
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Silica-titania glasses with small temperature variations in coefficient of thermal expansion over a wide range of zero-crossover temperatures and methods for making the glasses. The method includes a cooling protocol with controlled anneals over two different temperature regimes. A higher temperature controlled anneal may occur over a temperature interval from 750-950° C. or a sub-interval thereof. A lower temperature controlled anneal may occur over a temperature interval from 650-875° C. or a sub-interval thereof. The controlled anneals permit independent control over CTE slope and Tzc of silica-titania glasses. The independent control provides CTE slope and Tzc values for silica-titania glasses of fixed composition over ranges heretofore possible only through variations in composition.
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