Manufacturing and characterization of porous SiC for flow channel inserts in dual-coolant blanket designs

作者：Bereciartu Ainhoa; Ordas Nerea^*; Garcia Rosales Carmen; Morono Alejandro; Malo Marta; Hodgson Eric R; Abella Jordi; Sedano Luis

来源：Fusion Engineering and Design, 2011, 86(9-11): 2526-2529.

DOI：10.1016/j.fusengdes.2011.03.091

• Flow channel inserts
• Porous SiC
• Electrical conductivity
• Thermal conductivity
• Corrosion by Li-Pb

SiC is the primary candidate for the flow channel inserts in dual-coolant blanket concepts. Porous SiC ceramics are attractive candidates for this non-structural application, since they can satisfy the required properties through a low cost manufacturing route, compared to SiC(f)/SiC. This work shows first results of the manufacturing of porous SiC ceramics prepared with different amounts of Y(2)O(3) and Al(2)O(3) as sintering additives. C powders were used as pore-formers by their burnout during oxidation after sintering. Comparison of microstructure, porosity, flexural strength, thermal and electrical conductivity and corrosion under Pb-15.7Li of porous SiC without and with sintering additives is presented. The addition of 2.5 wt.% of Y(2)O(3) and Al(2)O(3) improves the mechanical properties, and reduces the thermal and electrical conductivity down to reasonable values. Preliminary corrosion tests under Pb-15.7 Li at 500 degrees C show that the absence of a dense coating on porous SiC leads to poor corrosion behavior.

• 出版日期2011-10