发明名称 |
Method for Producing a Quartz Glass granulate |
摘要 |
A silica glass granule has area of 100-5000 mu 2>, ECD (Not defined) of 5-100 mu m, circumference of 20-400 mu m, maximum diameter of 10-140 mu m, minimum diameter of 5-80 mu m, specific Brunauer Emmett Teller (BET) surface area of less than 1 m 2>/g, and impurities of less than 50 ppm. An independent claim is included for a method for preparing the silica glass granule comprising compacting pyrogenic silicon dioxide powder with tamped density of 15-190 g/l to slugs; crushing and removing slug fragments with a diameter of 100-800 mu m; treating slug fragments having tamped density of 300-600 g/l at 600-1100[deg] C in an atmosphere which comprises compounds for removing hydroxyl groups; and sintering at 1200-1400[deg] C. |
申请公布号 |
EP2014622(B1) |
申请公布日期 |
2017.01.18 |
申请号 |
EP20070111945 |
申请日期 |
2007.07.06 |
申请人 |
Evonik Degussa GmbH |
发明人 |
Schumacher, Kai;Schulze-Isfort, Christian;Brandl, Paul;Ochiai, Mitsuru |
分类号 |
C03C3/06;C03B19/06;C03B20/00;C03C12/00;C09C1/30 |
主分类号 |
C03C3/06 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|