Abstract
Multi-component solid solution composite ceramics (Ti0.9Nb0.03Ta0.03W0.03)3SiC2/Al2O3 were fabricated with a high yield by doping NbC, TaC and WC powders via in-suit synthesis, which demonstrated that using metallic carbide as dopants is more efficient than using metal powders to synthesize the desired products. The optimized hardness and flexural strength of (Ti0.9Nb0.03Ta0.03W0.03)3SiC2/Al2O3 were measured to be 16.6 ± 0.5 GPa and 695 ± 29 MPa, respectively, which represents significant improvements compared to Ti3SiC2/Al2O3 composite ceramics. To deeply understand the influence of dopants, the crystal structure of multi-component solid solutions and interface modeling of composite ceramics were built and evaluated by first-principle calculations. The results indicated that the strengthening effects derived from both intragranular improvements in solid solutions and intergranular enhancement of crystal interfaces.
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