Patent · US Expired

Tungsten doped crucible and method for preparing same

US6187089A · kind A · utility

36Cited by

7References

37Claims

0Family size

Assignee

MEMC Electronic Materials, Inc. · US

Inventors

Richard J. Phillips · Saint Peters, US
Steven Jack Keltner · O'Fallon, US

Key dates

Filing date	Feb 5, 1999
Grant date	Feb 13, 2001
Priority date	—
Expiry date	Feb 5, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T117/1032
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for preparing a quartz crucible having a tungsten doped layer on the inside surface, outside surface, or both the inside surface and the outside surface is disclosed. One or more surfaces of the crucible is exposed to a vaporous tungsten source to anneal the tungsten into the crucible surface and create a tungsten doped layer which behaves similarly to a bubble free layer upon use in a crystal pulling process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.