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过程工程学报 2012
Improvement in Anti-oxidation of Two-step Dipping Graphite with Different Solutions
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Abstract:
A two-step dipping method was used to treat graphite with two solutions for improving its oxidation resistance.One dipping solution was mainly composed of magnesium chloride,aluminum hydroxide,phosphoric acid and another one borax,sodium tripolyphosphate,titanium dioxide.The composition and structure and mass change of the dipped graphite were analyzed by SEM,TG-DTA and XRD.The results showed that the mass loss of dipped graphite sample was less than 10% in air at 1150℃ for 1 h and the oxidation resistance was increased by 60% compared with untreated blank sample.The treated sample had flat surface,compact structure and clear edge after high temperature treatment,which was different from blank sample.The two kinds of dipping solution in high temperature formed glass polymer which was attached on the surface and pores of graphite,playing the role of oxidation resistance.
