Next Article in Journal
The Activation and Evolution of Twinning during Bending of Friction Stir Welded AZ31 Magnesium Alloys
Previous Article in Journal
Evolution of Phase Transition and Mechanical Properties of Ultra-High Strength Hot-Stamped Steel During Quenching Process
Open AccessArticle

Investigations of Graphite Particle Interaction with Metallic Surfaces

Chair of Hydrogen and Nuclear Energy, Institute of Power Engineering, Technical University of Dresden, 01062 Dresden, Germany
Author to whom correspondence should be addressed.
Metals 2020, 10(1), 140;
Received: 2 December 2019 / Revised: 2 January 2020 / Accepted: 10 January 2020 / Published: 16 January 2020
Previous studies on the safety of gas-cooled high-temperature reactors (HTR) have analyzed the corrosion and oxidation behavior of the primary circuit components under normal and accident conditions. Through the use of graphite components, graphite particles can be formed by mechanical and chemical means whose influence on the structural change of metal surfaces must be analyzed in a comprehensive manner. The dust resuspension and deposition in tank geometry (DRESDEN-TANK) test facility was set up to thermally anneal metallic samples (Alloy 800H, Inconel 617) loaded with graphite particles under typical HTR conditions (helium, 750 °C, 6 MPa) for the investigation of interactions over a long-term range. In addition to the carrying out of a description of the processes occurring on the material surface, the gaseous reaction products have been analyzed. The results show that the presence of graphite particles in the near-surface layer has a significant impact on corrosion processes due to thermally-induced interactions. In this case iron and chromium are degraded in the metallic alloys, which leads to a structural change in the near-surface layer. Furthermore, the graphite particles significantly influence the formation of the oxide layers on the alloys; for example, they influence the formation speed of the layer and the layer height. The originally deposited particles thus exhibit a chemically-altered composition and a different geometric shape. View Full-Text
Keywords: HTR; Alloy 800H; Inconel 617; graphite particle; high temperature; oxide; passivation layer HTR; Alloy 800H; Inconel 617; graphite particle; high temperature; oxide; passivation layer
Show Figures

Graphical abstract

MDPI and ACS Style

Andris, A.; Fischer, F.; Herrmann, M.; Lippmann, W.; Hurtado, A. Investigations of Graphite Particle Interaction with Metallic Surfaces. Metals 2020, 10, 140.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop