US 6,548,131 B1 · Quartz glass crucible and process for the manufacture of the crucible

Abstract

To facilitate the start of a process using a quartz glass crucible with a crucible body and an inner layer of quartz glass a quartz glass crucible is provided with an inner surface roughened at least in the starting zone region by multiple depressions disposed at a maximum distance of 5 mm from one another. Furthermore, a simple and inexpensive process for the manufacture of such a quartz glass crucible is described, by providing a crucible body with a smooth inner surface of quartz glass and subsequently roughening the inner layer in the starting zone region by multiple depressions disposed at a maximum of 5 mm from one another.

Claims20

Dependent claims

A quartz glass crucible comprising:

a crucible body with an inner surface of quartz glass;
the inner surface comprising a roughened portion in a starting zone in said crucible, said roughened portion being roughened by multiple depressions therein;
the multiple depressions being spaced from one another at a maximum distance of 5 mm;
and
the inner surface outside of the starting zone being smoother than in said roughened portion, wherein said roughened portion in the starting zone is located in an upper third of the crucible.

2 more elements

Dependencies are inferred from the claim text.

Quartz glass crucible and process for the manufacture of the crucible

Life of this patent

Quartz glass crucible and process for the manufacture of the crucible

Life of this patent

Abstract

Claims20