High delivery temperature isopipe materials

Details High delivery temperature isopipe materials High delivery temperature isopipe materials

2009-02-24

2011-10-04

Daniels, Matthew (Department: 1741)

Glass manufacturing

Apparatus made of special material

Ceramic material

C264S683000, C501S097100

Reexamination Certificate

active

08028544

ABSTRACT:
Isopipes (13) for making a glass or a glass-ceramic using a fusion process are provided. The isopipes are made from a silicon nitride refractory material that is: (a) produced in block form in an atmosphere having a pO2of less than 0.1 using less than 10 weight percent of one or more sintering aids, (b) machined into an isopipe configuration, and (c) exposed to a partial pressure of oxygen equal to or greater than 0.1 for a period of time and at a temperature sufficient to form a SiO2layer (31) which exhibits substantially only a passive oxidation mechanism. The SiO2layer (31) serves as a protective barrier for further oxidation of the silicon nitride during use of the isopipe (13). The isopipes (13) exhibit less sag during use than isopipes composed of zircon.

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Professional translation of JP 11-246230.

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