The oxidation behavior of A3-3 matrix graphite
Author(s): ZHOU Xiang-wen, LU Zhen-ming, LI Xin-nan, ZHANG Jie, LIU Bing, TANG Ya-ping
Pages: 182-187
Year: 2016 Issue: 2
Journal: New Carbon Materials
Keyword: Oxidation behavior; Matrix graphite; Chemical control regime; Activation energy;
Abstract: The effects of temperature on the oxidation behavior of the A3-3 matrix graphite ( MG) in the temperature range 798-973 K in air with a flow rate of 100 mL/min to burn-offs of 10-15 wt%, were investigated by a home-made thermo-gravimetric ex-perimental setup. The oxidation rate ( OR) increases significantly with the temperature. The OR at 973 K is over 70 times faster than at 798 K. The oxidation kinetics of A3-3 MG in air at temperatures up to 973 K is in the reaction control regime, where the activa-tion energy is 176 kJ/mol and the Arrhenius equation could be described as:OR=2. 967 3×108·exp(21 124. 8/T) wt%/min. The relatively lower activation energy of MG than that of structural nuclear graphite indicates that MG is more easily oxidized.
Pages: 182-187
Year: 2016 Issue: 2
Journal: New Carbon Materials
Keyword: Oxidation behavior; Matrix graphite; Chemical control regime; Activation energy;
Abstract: The effects of temperature on the oxidation behavior of the A3-3 matrix graphite ( MG) in the temperature range 798-973 K in air with a flow rate of 100 mL/min to burn-offs of 10-15 wt%, were investigated by a home-made thermo-gravimetric ex-perimental setup. The oxidation rate ( OR) increases significantly with the temperature. The OR at 973 K is over 70 times faster than at 798 K. The oxidation kinetics of A3-3 MG in air at temperatures up to 973 K is in the reaction control regime, where the activa-tion energy is 176 kJ/mol and the Arrhenius equation could be described as:OR=2. 967 3×108·exp(21 124. 8/T) wt%/min. The relatively lower activation energy of MG than that of structural nuclear graphite indicates that MG is more easily oxidized.
Related Articles