The effects of subsonic and supersonic dissociated air flow on the surface of ultra-high-temperature HfB2-30 vol% SiC ceramics obtained using the sol-gel method

Simonenko, Elizaveta P.; Симоненко, Н. П.; Гордеев, А. Н.; Колесников, А. Ф.; Лысенков, А. С.; Нагорнов, И. А.; Sevastyanov, V. G.; Кузнецов, Н. Т.

doi:10.1016/j.jeurceramsoc.2019.11.023

Cited by 18 publications

(6 citation statements)

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“…To produce 35 vol.% ZrB 2 –35 vol.% HfB 2 –30 vol.% SiC (ZHS) and 31.5 vol.% ZrB 2 –31.5 vol.% HfB 2 –27 vol.% SiC–10 vol.% C CNT (ZHSC) ceramic materials, synthesized composite powders were sintered in graphite moulds using a hot-pressing press by Thermal Technology Inc. (model HP20-3560-20) in argon current at 1800 °C (heating rate 10 °C/min, holding time 30 min) and uniaxial pressure 30 MPa [ 12 , 15 , 55 , 56 , 57 , 58 ].…”

Section: Methodsmentioning

confidence: 99%

“…The optical properties also allow the materials on which they are based to be considered as components of alternative energy devices [ 7 , 8 , 9 , 10 , 11 ]. The formation of a protective borosilicate glass layer during oxidation, which prevents rapid degradation of deeper ceramic layers, leads to the fact that materials based on zirconium/hafnium diborides and silicon carbide can withstand even long-term exposure to high-speed dissociated air flows at surface temperatures of up to 2500 °C [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the Effect of Supersonic Flow of Dissociated Nitrogen on ZrB2–HfB2–SiC Ceramics Doped with 10 vol.% Carbon Nanotubes

et al. 2022

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The method of fabricating dense ultra-high temperature ceramic materials ZrB2–HfB2–SiC–CCNT was developed using a combination of sol-gel synthesis and reaction hot pressing approaches at 1800 °C. It was found that the introduction of multilayer nanotubes (10 vol.%) led to an increase in the consolidation efficiency of ceramics (at temperatures > 1600 °C). The obtained ZrB2–HfB2–SiC and ZrB2–HfB2–SiC–CCNT materials were characterized by a complex of physical and chemical analysis methods. A study of the effects on the modified sample ZrB2–HfB2–SiC–CCNT composition speed flow of partially dissociated nitrogen, using a high-frequency plasmatron, showed that, despite the relatively low temperature established on the surface (≤1585 °C), there was a significant change in the chemical composition and surface microstructure: in the near-surface layer, zirconium–hafnium carbonitride, amorphous boron nitride, and carbon were present. The latter caused changes in crucial characteristics such as the emission coefficient and surface catalyticity.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of the Effect of Supersonic Flow of Dissociated Nitrogen on ZrB2–HfB2–SiC Ceramics Doped with 10 vol.% Carbon Nanotubes

et al. 2022

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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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“…Accordingly, HfB 2 shows good oxidation resistance under ultra-high temperature environment [178]. Similar to ZrB 2 -based UHTCs, the introduction of SiC into HfB 2 can effectively improve the mechanical properties and oxidation resistance of the materials [179,180]. Similar to ZrB 2 -SiC composites, HfB 2 -SiC and HfB 2 -SiC-AlN after oxyacetylene test also have an obvious layered structure: The entire oxide layer can be divided into three layers from surface: 1) outermost oxide layer, 2) oxide sub-layer, and 3) unreacted bulk [181].…”

Section: Thermal Response Oxidation/ablation Behavior and Mechanisms ...mentioning

confidence: 99%

Advances in ultra-high temperature ceramics, composites, and coatings

et al. 2021

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Ultra-high temperature ceramics (UHTCs) are generally referred to the carbides, nitrides, and borides of the transition metals, with the Group IVB compounds (Zr & Hf) and TaC as the main focus. The UHTCs are endowed with ultra-high melting points, excellent mechanical properties, and ablation resistance at elevated temperatures. These unique combinations of properties make them promising materials for extremely environmental structural applications in rocket and hypersonic vehicles, particularly nozzles, leading edges, and engine components, etc. In addition to bulk UHTCs, UHTC coatings and fiber reinforced UHTC composites are extensively developed and applied to avoid the intrinsic brittleness and poor thermal shock resistance of bulk ceramics. Recently, highentropy UHTCs are developed rapidly and attract a lot of attention as an emerging direction for ultra-high temperature materials. This review presents the state of the art of processing approaches, microstructure design and properties of UHTCs from bulk materials to composites and coatings, as well as the future directions.

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The effects of subsonic and supersonic dissociated air flow on the surface of ultra-high-temperature HfB2-30 vol% SiC ceramics obtained using the sol-gel method

Cited by 18 publications

References 55 publications

Investigation of the Effect of Supersonic Flow of Dissociated Nitrogen on ZrB2–HfB2–SiC Ceramics Doped with 10 vol.% Carbon Nanotubes

Investigation of the Effect of Supersonic Flow of Dissociated Nitrogen on ZrB2–HfB2–SiC Ceramics Doped with 10 vol.% Carbon Nanotubes

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

Advances in ultra-high temperature ceramics, composites, and coatings

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