Thermoablative behaviors of designable hafnium carbonitride integrated with lattice of tungsten upon 3273K

摘要

Novel designed architecture of tailored HfC-HfN solid solution combined with laminated tungsten networks, spark plasma sintered at 2273 K with full density was investigated by multiple-characterizations in as-sintered and ablated states. The pristine substrate is composed of HfC0.72N0.28 solid solution and tungsten lattice with evident element diffusions. During long-time ablation(300 s) upon 3273 K the composites performed excellent anti-ablative performances and evolved into complex oxide scales, comprising condensed eutectic structures of HfO2-WO3 in the center and spindly HfO2 phase in the outer region. The tungsten networks contribute to the largely improved thermal shock resistances and oxidation resistances with increased viscosity of HfO2 melt.