Toughening by SiC Nanowires in a Dense SiC-Si Ceramic Coating for Oxidation Protection of C/C Composites

被引：35

作者：

Chu, Yanhui ^{[1
]}

Li, Hejun ^{[1
]}

Fu, Qiangang ^{[1
]}

Qi, Lehua ^{[2
]}

Zou, Xu ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Carbon Carbon Composites Res Ctr, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[2] Northwestern Polytech Univ, Sch Mechatron Engn, Xian 710072, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2012年 / 95卷 / 11期

基金：

中国国家自然科学基金;

关键词：

CARBON/CARBON COMPOSITES; IN-SITU; MECHANICAL-PROPERTIES; ROOM-TEMPERATURE; FRACTURE; MICROSTRUCTURE; PLASTICITY; LAYER;

D O I：

10.1111/j.1551-2916.2012.05412.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 Al3+ in the coating, damaged the network structure of SiO2 glass and resulted in the slight oxidation of C/C composites.

引用

页码：3691 / 3697

页数：7