Matrix modification of laminated SiC_w/SiC ceramic composites

Abstract

Laminated SiCw/SiC ceramic composites were fabricated by chemical vapor infiltration and tape casting, and the effects of matrix modification on microstructure and strengthening/toughening of the composites were investigated by polymer infltration and pyrolysis and liquid silicon infiltration. With increasing cycles of polymer infltration and pyrolysis, density of the composites increased effectively, and the flexural strength and fracture toughness increased obviously. With increasing time of liquid silicon infiltration, density of the composites increased significantly, but the flexural strength and fracture toughness increased firstly and then decreased gradually. After modification by polymer infiltration and pyrolysis, the bonding of interfacial and interlaminar was not changed, and the density increase led to the property increase. After modification by liquid silicon infiltration, the interlaminar bonding was not changed and interfacial bonding of whisker/matrix was strengthened, and the density increase led to the property increase.

Dielectric surface passivation for silicon solar cells: A review

“…Compared to a‐Si, the advantage of SiC x films is their tuneable bandgap in the range of 1.5–3 eV. This results in a reduced parasitic absorption and it is thus preferable to a‐Si . Stacks of a‐Si and SiC x on solar cells have also been investigated as a means to reduce the degradation of a‐Si passivation at elevated temperature .…”