发明授权
US4377405A Method for the production of flat, transparent vitreous silica slabs of low bubble content 失效
用于生产泡沫含量低的平坦,透明的玻璃石英玻璃板的方法

Method for the production of flat, transparent vitreous silica slabs of
low bubble content
摘要:
Flat, transparent slabs of vitreous silica of optical quality are produced by melting granular starting material in a vacuum by means of an electrical heating system. The starting material is melted while sustaining a heat flow from the top to the bottom of the crucible. The bottom of the crucible is made permeable to gases. The heat isolation power of the crucible wall increases from the bottom to the top of the crucible.
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