Activation and development of plasma-spark sintering of ceramic-metallic compositions through the incorporation of intermetallic compounds and the formation of crystalline decomposition products of SiBCN

The effect of complexes solid solution of intermetallic phase and different oxide, non-oxide components as well as crystalline decomposition products of amorphous SiBCN (c-C3N4, B12(B, C, Si)3, β-/α-SiC), (Ti, Cr, V, Mo)(C, N) and c-ZrO2 4 during spark plasma sintering at 1 GPa and 1800 °C, 12,5 GPa and 1800 °Con the phase composition, microstructure, grains sizes of crystalline phases, relative density, linear shrinkage, microstructural features of boundary layers, paths of microcracks, physical-mechanical properties, values of standart errors of properties of samples were shown. Synthesized powders of h-BN, NiCr, NiV, NiMo, NiTi, NiTa, NiZr are characterisized by different intensity of crystallization of h-BN, NiCr, NiV, NiMo, NiTi, NiTa, NiZr phases, SiBCN powder of different compositions is amorphous. Sintered by spark plasma method c-ZrO2, g-BC2N at pressing loadings 35 MPa and 1400 °C, 85 MPa and 1600 °Cshow different crystallization of c-ZrO2, g-BC2N phases, respectively, crystalline, variously uniform and dense microstructures. Sintered at ultra-high pressing loadings by spark plasma method samples show evoluted crystallization of α-Al2O3, c-ZrO2, Ni(Cr, V, Ti, Mo, Ta, Zr), β-SiAlON, B12(B, C, Si)3, (Ti, Cr, V, Mo) (C, N) compared to less evoluted crystalline c-C3N4, β-/α-SiC phases, more crystalline, uniform and densely sintered microstructures, variously dispersed grains of crystalline phases of the samples. Sintered samples show similar evolution of relative density, linear shrinkage, density, uniformity, width, path of boundary layers and propagating microcracks across these boundary layers, the resistance to the cracking, values of physical-mechanical and standart deviation pro-perties of the samples.