Method of evaluating silica powder, vitreous silica crucible, and method of manufacturing vitreous silica crucible
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 17, 2015
Grant Date -
Feb 16, 2012
app pub date -
Aug 3, 2011
filing date -
Aug 12, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The present invention provides a method of evaluating silica powder which, enables precise prediction of easiness of crystallization of a vitreous silica crucible. According to the present invention, provided is a method of evaluating silica powder including a sample preparation process for preparing a vitrified sample by fusing silica powder at a fusing temperature of 1700 to 1900 deg. C., followed by cooling; a sample heat treatment process for retaining the sample for 30 minutes or more at a temperature of 1400 to 1750 deg. C., followed by cooling; and a sample evaluation process for evaluating a state of opacification of the sample after the sample heat treatment process.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully