Dense in situ TiB2/TiN and TiB2/TiC ceramic matrix composites: reactive synthesis and properties

摘要: Abstract In the present research, near-fully dense in situ composites were fabricated from cold sintered B4C–3Ti and 2BN–3Ti powder blends with without addition of Ni. Two reactive synthesis techniques employed: combustion consolidation (pressure-assisted thermal explosion) hot pressing (displacement reaction under pressure) RHP. both approaches, processing or preheating temperature (≤1100°C) was considerably lower than those typical current methods used for processing/consolidation ceramic matrix composites. Microstructure characterization materials obtained performed using X-ray diffraction (XRD) scanning electron microscopy (SEM) energy dispersive analysis (EDS). Mechanical properties evaluated by measuring microhardness, fracture toughness three-point bending strength. Full conversion reagents into products achieved B4C–3Ti, B4C–3Ti–1.5Ni 2BN–3Ti–1.5Ni during consolidation, a moderate external pressure 150 MPa sufficient to ensure full density final products. Unlike this, no explosion occurred samples at 1100°C pressure. The entire procedure could be open air noticeable oxidation damage product. RHP route yielded finer microstructures, however has not been achieved. Ni shown enhance densification, as well improve synthesized.