Behavior of HfB2–30 vol% SiC UHTC obtained by sol–gel approach in the supersonic airflow

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

doi:10.1007/s10971-019-05029-9

Cited by 29 publications

(8 citation statements)

References 73 publications

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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%

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%

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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“…On the other hand, plasma is generated by creating an electric arc between two electrodes, and then plasma is formed from the continuous flow of gas. 20 The chemical reactions during high-velocity testing methods are comparable to specimens tested in a controlled furnace environment. Nevertheless, the mechanisms are altered during dynamic testing methods in experiments involving the combustion of gasses.…”

Section: 13mentioning

confidence: 97%

A critical analysis of the parameters affecting the oxidation behavior of ultra‐high‐temperature diboride ceramics

et al. 2021

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In the last few decades, research on the processing and properties of ultrahigh-temperature ceramics (UHTCs) has generated a substantial base of knowledge and left several unanswered questions. There is a large scatter in the literature data associated with the processing of UHTC borides prompting the non-reproducibility and non-uniformity in the microstructure and, thus, desired properties. Herein, the data on the oxidation behavior of UHTC borides ubiquitous in the entire literature are analyzed to understand the effect of composition, sintering parameters, densification, grain size, and oxidation conditions.A conjunction of graphical methods has been utilized to converge the scattered data and correlate the effect of variables and testing environment on the oxidation behavior. It was concluded that high densification (>95%), large grain size (∼8 μm), and 20-30 vol.% of Si-containing additives (SiC, Ta 5 Si 3 , and TaSi 2 ) could augment the oxidation resistance. The study elucidates that oxide scale thickness should be preferred over mass gain in future studies as a metric for measuring oxidation. The analysis presented here will allow the UHTC community to optimize diboride materials' design for hypersonic applications. The developed database on the oxidation performance of diborides will also transfer knowledge beyond the memory banks of the experts in the field. Furthermore, well-structured databases such as the one developed herein could be employed in data-driven approaches to optimize the design and manufacturing of ultrahigh-temperature materials in an efficient scheme.

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“…[ 29 ]. The sol–gel method has also been utilized extensively for the fabrication of non-metal oxide ceramics, such as carbide ceramics, including SiC [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ]. Compared to other processing methods, in addition to the aforementioned advantages, the sol–gel process can result in smaller pore sizes and better thieving abilities, and it is a common method for the preparation of ceramic nanofiltration (NF) membranes [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

Shi,

Jian,

Fang

et al. 2023

Membranes

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Silicon carbide (SiC) membrane has emerged as a promising class of inorganic ceramic membranes with many advantageous attributes and has been used for a variety of industrial microfiltration (MF) processes. The state-of-the-art industrial manufacturing of SiC membranes based on the particle sintering method can only achieve an average pore size that ranges from 40 nm to a few micrometers, which is still unsatisfactory for ultrafiltration (UF) applications. Thus, the pore size control of SiC membranes remains a focus of continuing study. Herein, we provide an in situ sol–gel modification strategy to tailor the pore size of SiC membranes by a superficial deposition of SiO2 onto the membrane surface and membrane pore channels. Our in situ sol–gel modification method is simple and effective. Furthermore, the physical characteristics and the filtration performance of the membrane can easily be controlled by the in situ reaction time. With an optimal in situ reaction time of 30 min, the average pore size of the membrane can be reduced from macropores (400 nm) to mesopores (below 20 nm), and the retention ability for 20 nm fluorescent PS microspheres can be improved from 5% to 93%; the resultant SiC/SiO2 composite membranes are imparted with water permeance of 77 L·m−2·h−1·bar−1, improved anti-protein-fouling properties, excellent performance, and anti-acid stabilities. Therefore, modified SiC/SiO2 membranes based on the in situ sol–gel process have great potential as UF membranes for a variety of industrial processes.

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Behavior of HfB2–30 vol% SiC UHTC obtained by sol–gel approach in the supersonic airflow

Cited by 29 publications

References 73 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

A critical analysis of the parameters affecting the oxidation behavior of ultra‐high‐temperature diboride ceramics

SiO2 Modification of Silicon Carbide Membrane via an Interfacial In Situ Sol–Gel Process for Improved Filtration Performance

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