Local Mechanical Properties of SiC - TiNbC Composite and its Constituents

摘要: SiC based composite with 50 % of additives (Ti and NbC ratio 9:16) has been prepared. The microstructure, porosity, chemical composition were studied using SEM equipped EDS analyser. Local mechanical properties such a hardness elastic modulus individual components the investigated by nanoindentation Berkovich indenter tip. Hardness fracture toughness material as whole was evaluated means classic Vickers macroindentation. Indentation cracks observed their propagation analyzed. It shown that present phases distributed uniformly. Moreover, final density satisfactory porosity lower than 1 %. constituents similar elasticity (550 - 590 GPa). (HIT) exhibited very pronounced load-size effect. At 10 mN load, 42.33 GPa ± 1.1 for 35.73 0.9 TiNbC, while at 500 27.61 0.505 GPa. is in good agreement macrohardness values, when 27.6 25 measured kg loads, respectively. 3.3 MPa.m1/2 0.22 MPa.m1/2. Electrical conductivity four point probes method its value 8.8×104 0.3×104 Sm-1.