Effect of nanocrystalline SiC addition on reactive SPS and oxidation resistance of Ta4HfC5 ceramics

Simonenko, Elizaveta P.; Симоненко, Е. П.; Папынов, Е. К.; Shichalin, O.O.; Белов, А.А.; Нагорнов, И. А.; Gorobtsov, Philipp Yu.; Кузнецов, Н. Т.

doi:10.1016/j.ceramint.2022.11.140

Cited by 6 publications

(1 citation statement)

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“…The preparation of the ceramic materials (HfB 2 -30%SiC)-1%C G ) was carried out according to a previously described method [42][43][44] using the reactive hot pressing method, since reactive high-temperature consolidation allows us to significantly reduce the temperature required to obtain dense samples [80][81][82][83][84][85]. Briefly, using sol-gel technology, a composite powder, HfB 2 -SiO 2 -C, containing, in addition to carbon black, the required amount of graphene, was synthesized and used for hot pressing of ceramics in graphite molds using a Thermal Technology Inc. hot press (model HP20-3560-20) at a temperature of 1800 • C (heating rate, 10 • C/min; dwell time, 15 min) and a pressure of 30 MPa.…”

Section: Synthesis and Sample Preparationmentioning

confidence: 99%

Oxidation of Ceramic Materials Based on HfB2-SiC under the Influence of Supersonic CO2 Jets and Additional Laser Heating

Simonenko,

Kolesnikov,

Chaplygin

et al. 2023

IJMS

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The features of oxidation of ultra-high-temperature ceramic material HfB2-30 vol.%SiC modified with 1 vol.% graphene as a result of supersonic flow of dissociated CO2 (generated with the use of high-frequency induction plasmatron), as well as under the influence of combined heating by high-speed CO2 jets and ytterbium laser radiation, were studied for the first time. It was found that the addition of laser radiation leads to local heating of the central region from ~1750 to ~2000–2200 °C; the observed temperature difference between the central region and the periphery of ~300–550 °C did not lead to cracking and destruction of the sample. Oxidized surfaces and cross sections of HfB2-SiC-CG ceramics with and without laser heating were investigated using X-ray phase analysis, Raman spectroscopy and scanning electron microscopy with local elemental analysis. During oxidation by supersonic flow of dissociated CO2, a multilayer near-surface region similar to that formed under the influence of high-speed dissociated air flows was formed. An increase in surface temperature with the addition of laser heating from 1750–1790 to 2000–2200 °C (short term, within 2 min) led to a two to threefold increase in the thickness of the degraded near-surface area of ceramics from 165 to 380 microns. The experimental results indicate promising applications of ceramic materials based on HfB2-SiC as part of high-speed flying vehicles in planetary atmospheres predominantly composed of CO2 (e.g., Venus and Mars).

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