TY - JOUR
T1 - Toughening by SiC nanowires in a dense SiC - Si ceramic coating for oxidation protection of C / C composites
AU - Chu, Yanhui
AU - Li, Hejun
AU - Fu, Qiangang
AU - Qi, Lehua
AU - Zou, Xu
PY - 2012/11
Y1 - 2012/11
N2 - A dense oxidation protective SiC-Si ceramic coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al 3+ in the coating, damaged the network structure of SiO 2 glass and resulted in the slight oxidation of C/C composites.
AB - A dense oxidation protective SiC-Si ceramic coating with well-dispersion SiC nanowires was prepared on carbon/carbon (C/C) composites using a two-step technique consisting of chemical vapor deposition and hot-pressing reactive sintering. The results showed that the toughness and thermal shock resistance of the coating were dramatically improved, resulting in an excellent oxidation protection for the coated C/C composites, which is attributed primarily to the toughening effects of SiC nanowires in the coating including two special energy dissipation mechanisms involving the super-plasticity deformation of SiC nanowires and the plastic fracture at the interface of the nanowire-matrix, except for nanowire pullout, nanowire bridging, and microcrack deflection. More importantly, a novel oxidation protective failure mechanism of the coated C/C composites revealed that the presence of Al 3+ in the coating, damaged the network structure of SiO 2 glass and resulted in the slight oxidation of C/C composites.
UR - http://www.scopus.com/inward/record.url?scp=84868451033&partnerID=8YFLogxK
U2 - 10.1111/j.1551-2916.2012.05412.x
DO - 10.1111/j.1551-2916.2012.05412.x
M3 - 文章
AN - SCOPUS:84868451033
SN - 0002-7820
VL - 95
SP - 3691
EP - 3697
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 11
ER -