Apparatus for making vitreous silica receptacles

Glass manufacturing – Means providing special atmosphere

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Details

65162, 65355, 65DIG4, 65DIG13, 165 18, 425144, 432 77, 266253, C03B 2900

Patent

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039727041

ABSTRACT:
Apparatus is disclosed for automated mass production of precision transparent silica glass products in accordance with a unique process in which slip-cast fused silica articles are rapidly heated and sintered in a vacuum or in a helium or hydrogen atmosphere at high temperatures, such as 2950.degree. to 3150.degree.F. A heated graphite susceptor shaped to conform to the outer surface of the fused silica article is automatically moved between a cooling zone and an induction furnace chamber which is opened momentarily to admit the article. The furnace and the graphite susceptor are designed to cause the trapped gases in the article to move radially outwardly and to effect rapid heating so as to avoid substantial devitrification during sintering.

REFERENCES:
patent: 1617056 (1927-02-01), Kenworthy
patent: 1876960 (1932-09-01), Kenworthy
patent: 2577611 (1951-12-01), Eves
patent: 2695475 (1954-11-01), Ellis
patent: 2917871 (1959-12-01), Atkeson
patent: 3619440 (1971-11-01), Gray

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