Abstract
Unidirectional SiTiCO fibre (Tyranno fibre®) reinforced SiAlON (Si 2Al 4O 4N 4) was fabricated by the filament winding method. The fibre/matrix green sheets were stacked and hot-pressed at 1773 K for 1.8 ks under a nitrogen atmosphere. The composite with a fibre content of 42 vol% showed significantly higher flexural strength (800 MPa) than that of monolithic SiAlON ceramics (570 MPa). A strength decrease due to the matrix degradation was observed at high temperature (1273 K and 1473 K). The fracture toughness of the composite measured by SENB (single edge notched beam) method was 8.0 MPa·m 0.5, being two times higher than that of monolithic ceramics (4.0 MPa·m 0.5). The work-of-fracture of the composite measured by static and dynamic methods was 9.62 kJ/m 2 and 8.29 kJ/m 2, respectively. 1998 Elsevier Science Limited and Techna S.r.l.
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