TY - JOUR
T1 - Structure and Materials of a Multi-Layer Coating for the Oxidation Protection of C/C Composites up to 1700°C
AU - Cheng, L.
AU - Xu, Y.
AU - Zhang, L.
PY - 1999
Y1 - 1999
N2 - A four-layer coating for the oxidation protection of C/C composites was presented on the basis of investigating failure mechanism of a three-layer coating by XRD, SEM, TEM, Auger and Raman. The three-layer coating, which can be used for 30 hours at 1650°C, consisted of a conversion SiC layer, a CVD SiC layer and a liquid-reaction Si-W layer. The failure process was essentially caused by interfacial reaction which produces gaseous pressure of higher than the ambient with non-homogeneous nucleation, growth, bursting and sealing of bubbles. Holes were formed on the surface of coating when the bubbles are large enough that the burst bubbles can not be sealed in time by the viscous flow. W ion increases oxygen diffusion through the oxide film of the coating, and accelerates the failure process. The four-layer coating consists of a conversion SiC inner layer, a CVD SiC barrier layer, a Si-Zr layer for increasing the interfacial stability of CVD SiC and outer layer, a sol-gel silica outer layer for decreasing oxygen diffusion.
AB - A four-layer coating for the oxidation protection of C/C composites was presented on the basis of investigating failure mechanism of a three-layer coating by XRD, SEM, TEM, Auger and Raman. The three-layer coating, which can be used for 30 hours at 1650°C, consisted of a conversion SiC layer, a CVD SiC layer and a liquid-reaction Si-W layer. The failure process was essentially caused by interfacial reaction which produces gaseous pressure of higher than the ambient with non-homogeneous nucleation, growth, bursting and sealing of bubbles. Holes were formed on the surface of coating when the bubbles are large enough that the burst bubbles can not be sealed in time by the viscous flow. W ion increases oxygen diffusion through the oxide film of the coating, and accelerates the failure process. The four-layer coating consists of a conversion SiC inner layer, a CVD SiC barrier layer, a Si-Zr layer for increasing the interfacial stability of CVD SiC and outer layer, a sol-gel silica outer layer for decreasing oxygen diffusion.
KW - C/C Composites
KW - Multi-Layer Coating
KW - Oxidation Protection
UR - http://www.scopus.com/inward/record.url?scp=0342315446&partnerID=8YFLogxK
M3 - 文章
AN - SCOPUS:0342315446
SN - 1013-9826
VL - 164-165
SP - 275
EP - 278
JO - Key Engineering Materials
JF - Key Engineering Materials
ER -