Mullite-zirconia-fibre/molybdenum-matrix composites: Strength and damage tolerance

Molybdenum-matrix composites reinforced with composite fibres containing mullite and zirconia in various proportions (including that corresponding to eutectic) were successfully produced by the internal crystallisation method. The composites are characterised by a high damage tolerance: the average notch sensitivity value is 0.71, while the maximum value of this parameter approaches 1. Composites with eutectic and off-eutectic fibre compositions are sufficiently strong at temperatures up to 1400 °C. The mean strength values are 178 MPa and 140 MPa at temperatures of 1300 and 1400 °C, respectively.