Microstructure, Densification and Mechanical Properties of TiB_2-TiC-NiAl Ceramic-Based Composite

摘要

By adjusting mass fraction of Ni-Al composite additive in Ti-B_4C primary system, a series of TiB_2-based ceramic composites were prepared by combustion synthesis in high gravity field. Because the adiabatic temperature of the whole reaction system maintained a constant in the presence of mass fraction of Ni-Al additive smaller than 18.55%, increasing mass fraction of Ni-Al additive to be 15% brought about the improved homogeneity in refined microstructure of the enhanced-densification TiB_2-based composite, so flexural strength and fracture toughness of the ceramic composite increased simultaneously due to the enhanced self-toughening mechanisms contributed by a number of fine TiB_2 platelets.