Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1985-09-24
1987-05-19
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 13, 65 17, 65136, 65DIG16, 423 72, 423 76, 423492, 501 30, C03B 37027
Patent
active
046664866
ABSTRACT:
Heavy metal fluoride glasses are made by a process that requires high purity fluoride constituent compounds, some of which are further refined by sublimation. Handling occurs in a protective atmosphere such as argon. The charge is placed in a sealed modified optical growth furnace having the ability of atmosphere control, heat control and position control of the charge. The charge is firstly raised to its fusion temperature, then to an admixture temperature, and finally to a higher temperature. The charge is immediately removed from the heating source and quickly cooled through the critical crystallization region. The total heating and cooling time being about one to two hours. The resulting glass ingot is partially annealed. The HMFG of (Zr or Hf)F.sub.4 -BaF.sub.2 -LaF.sub.3 -AlF.sub.2 consistently exhibits low levels of both light scattering and bulk OH contact, along with very reproducible hardness, thermal parameters, and UV and IR edge absorption behavior.
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"Techniques for the Preparation of Bulk High Optical Quality Heavy Metal Fluoride Glasses" Hutta et al, Solid State Sciences Division, Rome Air Development Center Hanscom AFB, MA 01731, #484-12, 6 pages Released 10/1984.
Mateika, D., "Substrates for Epitaxial Garnet Layers: Crystal Growth and Quality," Current Topics in Materials Science, vol. 11, ed. by Kaldis, 1984, pp. 164-165.
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Collier Stanton E.
Lindsay, Jr. Robert L.
Singer Donald J.
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