Interfacial bonding and friction in SiC fiber/{beta}` SiAlON composites
- Univ. of Illinois, Urbana, IL (United States); and others
Interfacial mechanical properties of SiC fiber-reinforced, combustion synthesized {beta}`-SiAlON composites were studied by a fiber push-out technique. Interfacial debonding and parameters were studied in terms of embedded fiber length. Stable, progressive interfacial debonding prior to fiber frictional sliding was observed in specimens with large embedded fiber lengths. Linear, shear-lag and progressive debonding models were used in the analysis of interfacial parameters. The coefficient of friction and the residual radial stress estimated from the progressive debonding model was 0.25 and 158 MPa, respectively, as compared to 0.26 and 102 MPa, respectively obtained from the shear-lag model. The radial residual stress extracted from either model was reasonably close to that (125 MPa) calculated from the thermal expansion mismatch and cooling temperature range. An axial residual load (8.7 N) extracted from the progressive debonding model was compared well with that (6.7 N) obtained from a calculation based on thermal expansion mismatch. The interfacial fracture toughness was calculated to be 0.5 J/m{sup 2}. TEM interfacial characterization correlated with SEM observation of the interfacial debonding site, revealed that interfacial debonding was attributed to the weak physical bonding between the outermost carbon-rich layer of the SiC fiber and the matrix.
- OSTI ID:
- 96581
- Report Number(s):
- CONF-940416--; CNN: Grant AFOSR-F49620-93-1-0227
- Country of Publication:
- United States
- Language:
- English
Similar Records
Interfacial bonding and friction in silicon carbide (filament)-reinforced ceramic- and glass-matrix composites
Shear Properties at the PyC/SiC Interface of TRISO-Coating