Ablative properties of ZrB2-based ceramic materials tested in a hypersonic plasma wind tunnel

Reference Presenter Authors
(Institution)
Abstract
14-087 Cristian Cley Parteniani Rita Rita, C.C.(Instituto Tecnológico de Aeronáutica/ Faculdade de Tecnologia de São Paulo); Campos, T.M.(Instituto Tecnológico de Aeronáutica); Caliari, F.R.(Instituto Tecnológico de Aeronáutica); Rocha, R.M.(Instituto de Aeronautica e Espaço); Essiptchouk, A.M.(Universidade Estadual Paulista); Petraconi Filho, G.(Instituto Tecnológico de Aeronáutica); A hypersonic plasma wind tunnel was optimized to investigate the ablative properties of ultra high temperature ceramics (UHTC) of ZrB2-SiC composites. Pressureless sintered samples of pure ZrB2 and mixtures with 10, 20 and 30 vol% of SiC were exposed to ablative testes. Experiments were performed at low pressure in a reactive air plasma using a non-transferred DC arc plasma torch coupled to a hypersonic nozzle (Mach 5), with enthalpies of 17.36 MJ/kg at 26.12 MJ/kg, corresponding to heat fluxes of 0.52 MW/m2 to 2.2 MW/m2. Under these conditions, the ablative property as the specific mass loss rate was evaluated as a function of the exposure time and heat flux supplied on the samples surface. Microstructural and chemical analysis on top samples surface were performed by SEM/EDS before and after ablative tests. The results showed that UHTCs of ZrB2-SiC in any SiC concentration improved the resistance to oxidation and thermal degradation in relation to pure ZrB2. Tested parameters influenced the ablative behavior of samples with and without SiC addition.
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