Method of making quartz glass crucibles, and apparatus carrying out the method Patent #: 4416680
ApplicationNo. 06/832614 filed on 02/24/1986
US Classes:65/17.3, With shaping of particulate material and subsequent fusing of particles264/101, VACUUM TREATMENT OF WORK264/102, To degas or prevent gas entrapment264/311, Utilizing centrifugal force65/302, ARTICLE FORMING MEANS UTILIZING MOLD MOTION (E.G., CENTRIFUGAL CASTING)65/35, With vibrating, oscillating or agitating a preform65/71Spreading of molten glass by rotation
ExaminersPrimary: Kellogg, Arthur D.
Attorney, Agent or Firm
International ClassesC03B 19/09 (20060101)
C03B 19/00 (20060101)
AbstractIn the manufacture of a quartz glass crucible of low bubble content, a first layer of granular quartz material is disposed on the interior of a rotating mold through the walls of which a vacuum can be drawn. A second layer of finer quartz material is then disposed on the first layer. The quartz material is then heated, melted and fused to form a crucible.