Furnace for producing fused silica glass

Details Furnace for producing fused silica glass Furnace for producing fused silica glass

1998-05-01

1999-09-14

Chin, Peter

Glass manufacturing

Processes

With shaping of particulate material and subsequent fusing...

65 174, 65144, 65413, 65416, 65414, 65DIG8, 501 54, 501900, 264 121, 264119, 264121, 264125, C03B 1901, C03B 1909

Patent

active

059517301

ABSTRACT:
Fused silica boules (19) having improved off-axis homogeneity are produced by controlling the air flow around the boule (19) during its formation. The boule is formed in a containment vessel (13) which collects soot from a plurality of burners (14). The containment vessel (13) rotates and oscillates relative to the burners (14) as the boule (19) is formed. Surrounding the containment vessel (13) is an air flow wall (130) which oscillates with the containment vessel (13). The air flow wall (130) is spaced from the containment vessel (13) by a gap (175) through which air flows during boule formation. The dimensions of this gap (175) remain constant as the boule is formed. Surrounding the air flow wall (130) is a stationary wall (160). The stationary wall (160) is spaced from the air flow wall (130) by a gap (165) whose dimensions change as the boule is formed. A motion accommodating seal (155) blocks air flow in this gap (165). By confining air flow to the gap (175) between the containment vessel (13) and the air flow wall (130), off-axis striae in the boule are essentially completely eliminated.

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