Abstract
Amorphous SiBCN monoliths featuring a structure of three-dimensional PDC-SiBCN network encapsulating MA-SiBCN nanoparticles (MA@PDC-SiBCN), were prepared without the need for sintering densification (>1800°C), enabling preparation of dense ceramics at a much lower temperature (1100°C). The continuous PDC-SiBCN network effectively inhibits oxygen diffusion, reducing the mass loss from B-C-N cluster oxidation and mass gain from silicon-containing clusters by 51.5% and 86.9%, respectively. Besides, the phase-separation coupled heterogeneous oxidation behaviors and kinetics of different atomic clusters in MA@PDC-SiBCN ceramic during non-isothermal oxidation up to 1500°C were investigated. Finally, the evolution of the different atomic clusters within the oxide layer during the heterogeneous oxidation process was analyzed to elucidate the micro-mechanisms behind the enhanced oxidation resistance.
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