Microstructure and Selected Properties of Al2O3 Matrix Composites Fabricated by Pulse Plasma Sintering of Al2O3 and Pre-composite Powder (NiAl–Al2O3)

Abstract Paper-related production of composite materials from Al 2 O 3 -pre-composite powder (NiAl–10 wt pct Al 2 O 3 ). PPS allowed for forming ceramic–intermetallic composites. MA produced the pre-composite powder. Six series of composites were made, differing in temperature (1200 °C, 1300 °C, 1400 °C) and content of pre-composite powder (2.5 and 5 wt pct with respect to the amount of Al 2 O 3 ). Highest hardness was obtained for composite series sintered at 1300 °C. Both series, with various pre-composite powder content, had a value of 20.8 to 20.9 GPa. Samples containing 2.5 wt pct pre-composite powder sintered at 1200 °C were highest K IC value of 4.72 ± 0.34 MPa·m 0.5 . Interestingly, the same value was obtained in composites containing 5 wt pct pre-composite powder sintered at 1300 °C. For both series with different pre-composite powder content, sintering at 1400 °C obtained the highest strength. For composites containing 2.5 wt pct pre-composite powder, splitting tensile strength value was 255.98 MPa, while for samples with 5 wt pct, pre-composite powder was 264.01 MPa Graphical Abstract