Fabrication and Properties of Quasi-Isotropic Silicon Nitride-boron Nitride Fibrous Monoliths
Quasi-isotropic Si3N4/BN fibrous monoliths have been fabricated from single-filament co-extruded green fiber with the [0°/45°/90°]s architecture. They are elasticly isotropic, with room temperature Young's modulus of 216°1 GPa. They exhibit graceful failure in flexure. The peak strength at room temperature is 330 MPa, associated with delamination along on-axis cell boundaries. Off-axis cell boundaries begin to fracture at a proportional limit of 280 MPa. Total work-of-fracture is 4700 J/m2 at room temperature. Graceful fracture also occurs at 1000°C and 1200°C, where the peak strength is 260 MPa and 143 MPa, respectively.
G. A. Danko et al., "Fabrication and Properties of Quasi-Isotropic Silicon Nitride-boron Nitride Fibrous Monoliths," Ceramic Engineering and Science Proceedings, John Wiley & Sons, Inc., Mar 2008.
The definitive version is available at http://dx.doi.org/10.1002/9780470294437.ch66
Materials Science and Engineering
Keywords and Phrases
Fibrous Monolithic Ceramics; Green Fiber; Room Temperature; Delamination; Fracture Energy
Article - Journal
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