AN EVALUATION METHOD ON DEGREE OF GRAPHITIZATION OF CARBON MATERIALS UNDER HIGH TEMPERATURE AND HIGH PRESSURE

摘要

The majority of early studies used X-raydiffraction, but this requires a model to interpretthe diffraction processes. A turbostratic model hasbeen applied by Warren, Franklin and Bacon to a widerange of materials including both soft and hard cabons.Maire and Mering applied the same methods to theinterpretation of the (001) lines of a series ofgraphitic carbons. In our case, graphitic carbonsundergone high temperature and high pressuregraphitization processes have been evaluated by thesame methods. It were found that most technologicalXRD data were obtained by a Rietveld method with theleast-squares refinements could be in the simplest waysince the full correction technique is very laborious.The behavior of carbon materials as it proceedsthrough the graphitization process is characterizedby changes in the measured interlayer spacings (d) asa function of temperature. A series of graphiticcarbons including the transformation of diamond tographite through the process under high temperatureand high pressure have been evaluated A simplecalibration equation has been established.