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公开(公告)号:US5306388A
公开(公告)日:1994-04-26
申请号:US828503
申请日:1992-01-31
申请人: Toshio Nakajima , Tohru Ito , Yoshinobu Nagamine
发明人: Toshio Nakajima , Tohru Ito , Yoshinobu Nagamine
CPC分类号: C30B15/10 , C03B19/095 , Y02P40/57 , Y10S117/90 , Y10T117/1032
摘要: A quartz glass crucible for pulling a single crystal, which comprises a cylindrical straight wall portion, a bottom wall portion and a curved intermediate wall portion connecting the straight portion and the bottom portion. The straight portion has an opaque area positioned within about 75% or less of the total height of the crucible, measured from the upper open end of the crucible. The opaque area in the straight portion has a total bubble volume which ranges from about 7.times.10.sup.-3 cm.sup.3 /cm.sup.3 to 30.times.10.sup.-3 cm.sup.3 /cm.sup.3. The remaining straight portion, the curved intermediate portion and the bottom portion consist of transparent material having a total volume of bubbles of about 4.times.10.sup.-3 cm.sup.3 /cm.sup.3 or less.
摘要翻译: 一种用于拉出单晶的石英玻璃坩埚,其包括圆柱形直壁部分,底壁部分和连接直线部分和底部部分的弯曲中间壁部分。 直线部分具有位于坩埚的总高度的约75%或更小的不透明区域内,从坩埚的上开口端测量。 直线部分中的不透明区域的总气泡体积为约7×10 -3 cm 3 / cm 3至30×10 -3 cm 3 / cm 3。 剩余的直线部分,弯曲的中间部分和底部部分由具有约4×10 -3 cm 3 / cm 3以下的总气泡体积的透明材料构成。