Effect of 2 vol % Graphene Additive on Heat Transfer of Ceramic Material in Underexpanded Jets of Dissociated Air

Simonenko, Elizaveta P.; Симоненко, Н. П.; Колесников, А. Ф.; Чаплыгин, А. В.; Сахаров, В. И.; Лысенков, А. С.; Нагорнов, И. А.; Кузнецов, Н. Т.

doi:10.1134/s0036023622601866

Cited by 5 publications

(3 citation statements)

References 83 publications

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“…The HfB 2 -30vol.%SiC ceramic material was prepared using the reaction hot pressing method described in [30][31][32], as the use of the reaction sintering technique allows for a slightly lower consolidation temperature [22,[33][34][35][36]. Briefly, the synthesis of the initial HfB 2 -SiO 2 -C powder was carried out using sol-gel technology and its further hot pressing was performed using a hot press model HP20-3560-20 (Thermal Technology Inc., Minden, NV, USA) at a temperature of 1800 • C (heating rate 10 • /min) and a uniaxial pressure of 30 MPa in an argon atmosphere; the dwell time was 15 min.…”

Section: Ceramic Sample Preparationmentioning

confidence: 99%

Short-Term Oxidation of HfB2-SiC Based UHTC in Supersonic Flow of Carbon Dioxide Plasma

Chaplygin,

Simonenko,

Kotov

et al. 2024

Plasma

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The short-term (5 min) exposure to the supersonic flow of carbon dioxide plasma on ultrahigh-temperature ceramics of HfB2-30vol.%SiC composition has been studied. It was shown that, when established on the surface at a temperature of 1615–1655 °C, the beginning of the formation of an oxidized layer takes place. Raman spectroscopy and scanning electron microscopy studies showed that the formation of a porous SiC-depleted region is not possible under the HfO2-SiO2 surface oxide layer. Numerical modeling based on the Navier–Stokes equations and experimental probe measurements of the test conditions were performed. The desirability of continuing systematic studies on the behavior of ultrahigh-temperature ZrB2/HfB2-SiC ceramics, including those doped with various components under the influence of high-enthalpy gas flows, was noted.

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Section: Ceramic Sample Preparationmentioning

confidence: 99%

Short-Term Oxidation of HfB2-SiC Based UHTC in Supersonic Flow of Carbon Dioxide Plasma

Chaplygin,

Simonenko,

Kotov

et al. 2024

Plasma

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show abstract

“…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%

“…Modification of these ceramic materials with carbon materials (graphite, carbon fibers or carbon nanotubes), as shown in [34][35][36][37][38][39][40][41], makes it possible to slightly improve crack resistance and thermal shock resistance. In our previous studies, it was established [42][43][44] that due to the introduction of a small amount (1-2 vol.%) of graphene into the composition of HfB 2 -30 vol.%SiC material, there is an opportunity to reduce the degree of its degradation (thickness of the oxidized layer and rate of entrainment) by reducing the temperature that is reached at the surface under the same thermochemical effect of supersonic dissociated air flow, which is probably due to the increase in thermal conductivity.…”

Section: Introductionmentioning

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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Heat transfer and behavior of ultra high temperature ceramic materials under exposure to supersonic carbon dioxide plasma with additional laser irradiation

Chaplygin,

Simonenko,

Simonenko

et al. 2024

International Journal of Thermal Sciences

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Effect of 2 vol % Graphene Additive on Heat Transfer of Ceramic Material in Underexpanded Jets of Dissociated Air

Cited by 5 publications

References 83 publications

Short-Term Oxidation of HfB2-SiC Based UHTC in Supersonic Flow of Carbon Dioxide Plasma

Short-Term Oxidation of HfB2-SiC Based UHTC in Supersonic Flow of Carbon Dioxide Plasma

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

Heat transfer and behavior of ultra high temperature ceramic materials under exposure to supersonic carbon dioxide plasma with additional laser irradiation

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