Imported petroleum needle coke was pulverised, mixed with suitable binder pitch and extruded as green rods. These green rods were carbonised at 900 deg C in a laboratory carbonising furnace in a protected atmosphere. These carbonised rods were heat treated at 2000, 2200, 2400, 2600, 2800 deg C in resistance type tube furnace in nitrogen atmosphere. After heat treatment the samples were determined for specific resistance values. Further, these rods were crushed to -200 mesh powder and subjected to X-ray diffraction analysis for structural studies and degree of graphitisation. It was observed that the carbon body changed to graphite between 2700 deg C to 2800 deg C or at specific resistance values of around 107.5 x 10~(-5) ohm-cm.
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机译：将进口的石油针状焦粉粉碎，与合适的粘合剂沥青混合，然后挤压成生坯。这些生坯在实验室碳化炉中在保护气氛下于900摄氏度碳化。这些碳化棒在氮气氛的电阻式管式炉中在2000、2200、2400、2600、2800℃下进行热处理。热处理后，确定样品的电阻率值。此外，将这些棒粉碎成-200目粉末，并进行X射线衍射分析以进行结构研究和石墨化程度。据观察，碳体在2700摄氏度至2800摄氏度之间或在107.5 x 10〜（-5）ohm-cm的电阻率下变为石墨。
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