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The grain boundary phases in SiC/Si 3 N 4  nano/micro-composite changes with time of high temperature treatment at 1750 °C in nitrogen atmosphere. Stable phases were obtained after 26 hours of annealing. Moreover, the average grain diameter distribution was significantly changed. The hardness and fracture toughness of the SiC/Si 3 N 4  nano/micro-composites decreased with the duration of the high-temperature treatment. Both findings can be explained by the different secondary crystalline phases formed during the high-temperature treatment. Phases Si 2 N 2 O, Y 2 SiO 5 , and Y 2 Si 2 O 7 , typical for the samples treated up to 4 h, were replaced by the YNSiO 2  phase in the samples treated longer than 26 h. Anisotropy of the measured mechanical properties in different sample cross-sections caused by the Si 3 N 4  grain alignment become negligible after long term high-temperature treatment.

Microstructure, hardness, and fracture toughness evolution of hot-pressed SiC/Si 3 N 4 nano/micro composite after high-temperature treatment