Oxidation Resistance of Form-stable High-temperature Phase Change Thermal Energy Storage Materials Doped by Impregnated Graphite

Abstract

We adopted the solution impregnation route with aluminum dihydrogen phosphate solution as liquid medium for effective surface modification on graphite substrate. The mass ratio of graphite to Al(H₂PO₄)₃ changed from 0.5:1 to 4:1, and the impregnation time changed from 1 to 7 h. The typical composite phase change thermal storage materials doped with the as-treated graphite were fabricated using form-stable technique. To investigate the oxidation and anti-oxidation behavior of the impregnated graphite at high temperatures, the samples were put into a muffle furnace for a cyclic heat test. Based on SEM, EDS, DSC techniques, analyses on the impregnated technique suggested an optimized processing conditions of a 3 h impregnation time with the ratio of graphite: Al(H₂PO₄)₃ as 1:3 for graphite impregnation treatment. Further investigations on high-temperature phase change heat storage materials doped by the treated graphite suggested excellent oxidation resistance and thermal cycling performance.

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