Germanate Glass Ceramic.
Patent, Filed 23 Dec 94, patented 23 Jan 96,
DEPARTMENT OF THE NAVY WASHINGTON DC
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A germanate glass ceramic article which has better thermal and physical properties than the competing materials of zinc sulfide, spinel, and sapphire is made by mixing germanate ceramic glass components melting the components to form a molten mass cooling the molten mass to form a solid glass article nucleating the solid article by heating it in the range of about 630 deg-790 deg C. for about 1-16 hours to develop nuclei in the article and crystallizing the nucleated article by heating it, after nucleation, in the range of about 12 minute to about 8 hours to grow the nuclei to crystallites having an average diameter of less then about 1000 nanometer nm and cooling to form the glass ceramic.
- Ceramics, Refractories and Glass
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy