Oxidation of innovative carbon based materials for future energy systems


Oxidation of innovative carbon based materials for future energy systems

Hinssen, H.-K.; Krüssenberg, A.-K.; Moormann, R.; Wu, C.-H.

Due to their excellent mechanical and thermal properties C-based materials are used in High Temperature (HTR) and Fusion Reactor concepts for basic components: Fuel elements and reflectors of HTRs are made from graphite and in Fusion Reactors parts of the plasma facing components within the vacuum vessel consist of C-based materials. Because of their limited oxidation resistance at high temperatures accidents, leading to contact of oxidising gases (air or steam) with these carbon components, have to be considered in safety analyses. In addition, strength loss of carbon materials due to oxidation by impurities in cooling gas is an important aspect for HTR normal operation; accordingly, selection of carbon materials has to take into account their oxidation resistance.
This paper gives an overview on theoretical work and measurements in Jülich concerning oxidation kinetics of selected innovative C-based materials (graphite, CFC) with and without doping in oxygen (523 - 1223 K) and steam (1100 - 1523 K). Also data and theoretical models on depth of penetration of the oxidation process are presented. Data on oxidation induced release of hydrogen isotopes from redeposited a-C:H layers on first walls in fusion reactors are outlined, too.
Futheron, fields of insufficient knowledge are identified: These include data for an improved oxidation model considering both in-pore diffusion and chemical reaction and data/models on catalytic oxidation. Also, a lack of data on the Boudouard reaction, which has to be considered in course of air ingress accidents, was identified.

Keywords: carbon based materials; oxidation kinetic

  • Poster
    in: High Temperature Materials Chemistry, ed. by K. Hilpert, F.W. Froben, L. Singheiser, Schriften des Forschungszentrums Jülich, Series Energy Technology, (2000), Volume 10, ISBN 3-89336-259-2
  • Contribution to external collection
    in: High Temperature Materials Chemistry, ed. by K. Hilpert, F.W. Froben, L. Singheiser, Schriften des Forschungszentrums Jülich, Series Energy Technology, (2000), Volume 10, ISBN 3-89336-259-2

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Publ.-Id: 3287