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In order to protect carbon/carbon (C/C) composites from oxidation, a silicon carbide coating has been produced by a two-step pack cementation technique. XRD analysis showed that the inner coating obtained from the first step was a β-SiC layer and the outer coating formed by the second step pack cementation was composed of α-SiC, Si and β-SiC. The as-received coating provided excellent oxidation resistance,...
In order to eliminate the mismatch of thermal expansion coefficient between the ZrO 2 outer layer and the internal bonding SiC layer, ZrO 2 -SiO 2 composition-gradient transition layers were prepared by a sol-gel technique using tetraethoxysilane (TEOS) and zirconyl chloride as source materials. Energy dispersive spectroscopy (EDS) analysis displays that the gradient composition...
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