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US 4,964,902 AGranted
Method of extracting spin cast fused silica
AssigneeQuartz & Silice
InventorsPaul Guibert, Francis A. P. Launay
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AssigneeQuartz & Silice
InventorsPaul Guibert, Francis A. P. Launay
Estimating the term…
This invention relates to a method of making an object of silica glass, such as a crucible, according to which a pot capable of rotating about its axis is filled with a refractory pulverulent material. The pot is rotated and a cylindrical cavity is formed in the material, the axis of which coincides with that of the pot. The bottom and the wall of the cavity are then formed to a certain thickness with a silica-rich material. This silica-rich material is melted, the object thus produced is cooled and then extracted vertically by an extraction mechanism comprising a gripping member which is rotating, at least initially, at the same speed as the pot.
A method of making a fused silica glass object which comprises:
In a method for making a fused silica glass object in a rotating pot by filling the pot with a pulverulent refractory material, rotating the pot to form a cavity in said pulverulent material, introducing a fusible, silica-rich glass forming material into the cavity, melting said silica-rich glass forming material to form a fused silica object in the shape of said cavity and with an open interior portion, and cooling the silica glass object produced, the improvement which comprises removing the fused silica glass object from said cavity by extracting the object vertically while the pot and object are rotating while sealingly contacting the upper edges of said object with a rotating gripping member;
A method of making a fused silica glass object which comprises:
Dependencies are inferred from the claim text.