Process for the production of glass
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United States of America Patent
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May 9, 1989
Grant Date -
N/A
app pub date -
Oct 27, 1987
filing date -
Feb 28, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a process for production of a glass by the vacuum melting method using silica as raw material and comprises uniformly preheating a silica powder containing an accelerator for phase conversion to about 800.degree. C.; filling the preheated silica powder in a container while substantially maintaining the temperature; further heating the silica powder to convert it into a sintered body having a cristobalite phase; and then heating and melting the sintered body in vacuum for glass formation, whereby not only are improvments in raw material efficiency and productivity by shortening of the heating time achieved, but also the formation of cracks on the surface of the resulted sintered body which has been one of the important reasons for resulting in products of sub-standard can be substantially completely avoided.
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