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普通无烟煤基阴极炭块在铝电解槽中使用４个月左右就石墨化。为了研究此石墨化机理，利用２０ｋＷ工频炭管炉进行了包括在炭素试样中添加ＮａＦ，Ｎａ３ＡｌＦ６，Ｎａ２ＣＯ３等并在炭素试样上通入直流电的试验。试验温度为１４００～１８００℃，提高温度的目的是为了加速炭素试样的石墨化过程；在高温下，Ｎａ２ＣＯ３能够与碳发生反应生成金属钠蒸气。试验结果表明，这些因素都能使炭素试样的石墨化度增大，都具有一定的催化作用。铝电解槽炭阴极的石墨化可能是由于氟盐、金属钠和直流电场综合作用的结果。
Ordinary anthracite-based cathode carbon block in the use of aluminum cells in about 4 months on the graphitization. In order to study this graphitization mechanism, a test was carried out using a 20kW power frequency carbon tube furnace to add NaF, Na3AlF6, Na2CO3 and the like to a carbonaceous sample and to pass a DC power to the carbonaceous sample. The test temperature is 1400-1800 ° C. The purpose of increasing the temperature is to accelerate the graphitization process of the carbon sample; at high temperatures, Na2CO3 reacts with carbon to form metallic sodium vapor. The experimental results show that these factors can make the carbon sample of the degree of graphitization increased, have a certain catalytic effect. The graphitization of the carbon cathode of an aluminum reduction cell may be the result of a combination of fluoride salt, sodium metal and DC electric field.