A STUDY OF INTERFACE DEBONDING AND INTERFACE ROUGHNESS OF SiC FIBER REINFORCED GLASS-CERAMIC

摘要

The intcrfacial roughness of SiC (Nicalon) fiber reinforced LAS glass-ceramic was measured by pushback test. A fiber was partially pushed out of a surrounding matrix and subsequently pushed back the opposite direction. In all case, a rapid decrease in load occurred as the fiber seated back in its original position. The magnitude of drop was correlated with the spatial amplitude of the intcrfacial roughness. Transmission Electron Microscope (TEM), Energy dispersive X-ray spectroscopy (EDS) and Electron energy loss spectroscopy (EELS) were used to investigate the interfacial composition and micromorphology. It indicated that matrix composition had substantial influence on interfacial debonding and intcrfacial roughness because of different interfacial structure formed by different matrix composition. The composite containing Nb_2O_3 dopant exhibited smaller roughness than that containing B_2O_3 dopant. In addition, the interfacial roughness of the composite that experienced heat exposition in air was also studied.