Combustion-synthesized β′-SiAlON reinforced with SiC monofilaments

摘要: Abstract Dense composites of combustion-synthesized β′-Si 3 Al O N 5 (β′-SiAlON) reinforced with 20 vol.% SiC monofilaments (AVCO SCS-6) were hot pressed at a temperature 1600 °C for 2 h under pressure 34 MPa. The mechanical properties as-fabricated investigated in the three-point flexure mode. exhibited significant improvement work fracture as well ultimate strength, comparison monolithic β′-SiAlON. Ultimate strength values between 682 and 793 MPa composite 398 528 β′-SiAlON obtained. A 13–20 kJ m −2 was obtained composite, compared 1.7-3.1 material. Optical microscopy scanning electron (SEM) examinations fractured specimens showed usual toughening mechanisms microcracking. interfacial debonding, filament bridging pull-out. shear frictional stress also fiber push-out technique. load-deflection curves revealed moderate bonding 26 sliding 24 Transmission characterization correlated SEM observation debonding site. It presence definite but weak physical outermost carbon-rich layer matrix. appeared that matrix compatible each other both physically chemically, despite fact contained wt.%Al secondary phase.