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与其它材料相比,石墨有熔点高(3650℃)、高温中蒸气压低(在2000℃时约10~(-5)mm水银柱高)、导电良好、机械加工容易等特点。如果采用超高纯石墨电阻炉作为拉制石英光纤的热源,可以有污染小、温度容易控制、温度分布场可以根据工艺的需要进行调整,并且还有使用简单、成本低、效率高等特点。因此,我们在着手研究拉制石英材料光纤工艺时就开始了将高纯石墨电阻炉用做拉制光纤热源的研究。目前,国内外已广泛采用石墨电阻炉拉
Compared with other materials, graphite has high melting point (3650 ℃), low vapor pressure at high temperature (about 10 ~ (-5) mmHg at 2000 ℃), good electrical conductivity, easy machining and so on. If the use of ultra-high purity graphite resistance furnace as a drawing of quartz fiber heat source, you can have a small pollution, easy to control the temperature, the temperature distribution field can be adjusted according to process needs, and there are simple to use, low cost, high efficiency. Therefore, when we started to study the optical fiber technology of the drawn quartz material, we started to study the high purity graphite resistance furnace as the heat source for drawing optical fiber. At present, graphite resistance furnace has been widely used at home and abroad