Microstructural investigations of the pyrocarbon interphase in SiC fiber-reinforced SiC matrix composites

Abstract The microstructure of the pyrocarbon interphase in SiC fiber-reinforced SiC matrix (SiCf/SiC) composites and its transformations during fiber/matrix debonding were studied. The phenomena of bridging and delamination within the pyrocarbon interphase are found during fiber/matrix debonding. A new phenomenon of ‘stress orientation’ of the basal planes of the pyrocarbon in the bridging region is discovered. It is found that the microstructural features of the pyrocarbon interphase are in favor of the toughness improvement of the SiCf/SiC composites.

[1]  J. D. Landes,et al.  Influence of fiber coating thickness on fracture behavior of continuous woven Nicalon® fabric-reinforced silicon-carbide matrix ceramic composites , 2001 .

[2]  Zhong Lin Wang,et al.  Characterization of interfaces in C fiber-reinforced laminated C–SiC matrix composites , 2000 .

[3]  Richard E. Jones,et al.  SYLRAMIC™ SiC fibers for CMC reinforcement , 2000 .

[4]  J. Bouix,et al.  Sol-gel preparation and thermo-mechanical properties of porous xAl2O3–ySiO2 coatings on SiC Hi-Nicalon fibres , 2003 .

[5]  A. Boronin,et al.  The yttria-stabilized zirconia and interfacial coating on Nicalon™ fiber , 2006 .

[6]  A. Kohyama,et al.  Microstructure analysis and strength evaluation of reaction sintered SiC/SiC composites , 2001 .

[7]  A. Kohyama,et al.  Improvement of mechanical properties of SiC/SiC composites by various surface treatments of fibers , 2001 .

[8]  S. Jitsukawa,et al.  Mechanical properties of SiC/SiC composite with magnesium–silicon oxide interphase , 2007 .

[9]  J. P. Singh,et al.  Ceramic composites: roles of fiber and interface , 1999 .

[10]  M. Endo,et al.  Stress graphitization of C/C composite reinforced by carbon nanofiber , 2005 .

[11]  Akira Kohyama,et al.  Fabrication of advanced SiC fiber/F-CVI SiC matrix composites with SiC/C multi-layer interphase , 2004 .

[12]  B. Riccardi,et al.  Characterization of commercial grade Tyranno SA/CVI-SiC composites , 2007 .

[13]  R. Naslain.  Design, preparation and properties of non-oxide CMCs for application in engines and nuclear reactors: an overview , 2004 .