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High-temperature oxidation of SiC-Ta-SiC sandwich cladding tubes in GFR atmosphere

Steinbrück, Martin ORCID iD icon

Abstract (englisch):

Silicon carbide ceramic-matrix-composites (CMC) are considered as promising candidates for cladding tubes in GFRs and LWRs. In the framework of the EC funded project MatISSE SiC(-Ta)-SiC ceramic matrix composites (CMC) are investigated in impure helium prototypic for GFR cooling gas atmosphere.
Thermo-gravimetric experiments have been completed including SiC-SiC samples without Ta liner with three different surface qualities at 900-1500°C, sandwich samples at 1200-1400°C, and tantalum tube specimens at 900 and 1100°C.
All tests were performed in a TESTARAM TAG with He atmosphere with the following impurities: 210 vppm H2, 210 vppm CO, 140 vppm N2, and 70 vppm each of O2, H2O, CH4, and CO2. These should be the partial pressures of the impurity gases at operational pressure of 70 bar.
Passive oxidation, i.e. a slight mass gain due to the formation of a passivating silica scale was observed at temperatures up to 1200°C. Starting from 1300°C active oxidation, i.e. with mass loss due to the volatilization of SiC, took place as can be seen in Fig. KIT-1. The mass loss increased with raising temperature. The surface quality of the samples (as produced, ground, smooth) has minor effects on the oxidation especially at the lower temperatures. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Vortrag
Publikationsjahr 2016
Sprache Englisch
Identifikator KITopen-ID: 1000062564
HGF-Programm 32.02.11 (POF III, LK 01) Auslegungsüberschreitende Störfälle
Veranstaltung 22nd International QUENCH Workshop, 18-22 October 2016, Karlsruhe Institute of Technology, Karlsruhe, Germany
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