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Thermophysics and Aeromechanics

2020 year, number 5

Refractory HfC-HfN ceramics tested in a plasma flow

A.P. Zavyalov1, D.V. Sergachev2, I.P. Gulyaev2, O.O. Shichalin1,3, E.K. Papynov1,3
1Far Eastern Federal University, Vladivostok, Russia
2Khristianovich Institute of Theoretical and Applied Mechanics SB RAS, Novosibirsk, Russia
3Institute of Chemistry FEB RAS, Vladivostok, Russia
Keywords: refractory ceramic, spark plasma reaction-based sintering, hafnium carbide, hafnium nitride, system hafnium carbide-hafnium nitride

Abstract

The paper presents a study in stability of ceramics of hafnium carbide-nitride subjected to impact of a nitrogen plasma jet in air atmosphere. The best thermal resistance was demonstrated for ceramics with N/C » 0.698, which is determined by the maximum of surface temperature and minimum mass loss in the series of HfC- HfN solid solutions.