发明名称 |
Method and apparatus for producing glass preform |
摘要 |
A method for producing a glass preform by synthesizing a porous glass preform by a vapor-phase synthesizing method and heating said porous glass preform in a vacuum or reduced-pressure atmosphere so as to consolidate said porous glass preform, which comprises the steps of: a first step of degassing said porous glass preform to thereby remove gas adsorbed or contained therein; a second step of temporarily contracting said porous glass preform at a temperature higher than a temperature in the first step and lower than a consolidation temperature; and a third step of consolidating said porous glass preform at the consolidation temperature; the degassing of said first step is determined in accordance with the bulk density of said porous glass preform. |
申请公布号 |
SE9802978(D0) |
申请公布日期 |
1998.09.03 |
申请号 |
SE19980002978 |
申请日期 |
1998.09.03 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES LTD |
发明人 |
TOMOHIRO *ISHIHARA;YUICHI *OHGA;SATOSHI *TANAKA |
分类号 |
G02B6/00;B01D19/00;C03B37/014;(IPC1-7):C03B/ |
主分类号 |
G02B6/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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