Behavior of HfB2-SiC (10, 15, and 20 vol %) ceramic materials in high-enthalpy air flows

Simonenko, Elizaveta P.; Гордеев, А. Н.; Симоненко, Н. П.; Васильевский, С. А.; Колесников, А. Ф.; Папынов, Е. К.; Shichalin, O.O.; Авраменко, В. А.; Sevastyanov, V. G.; Кузнецов, Н. Т.

doi:10.1134/s003602361610017x

Cited by 32 publications

(12 citation statements)

References 39 publications

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“…The mixture (12.12 g) was placed in a graphite crucible and sintered according to the programmed regime in the vacuum (6 Pa) in the SPS-515S (Dr. Sinter-LABTM, Japan) to obtain the Sample. The chosen regime based on the related topics [2,8,9] and the team experience (for example, [10][11][12][13]). The average heating rate was 100 C/min, the maximum sintering temperature was 2100 C, the holding time at a maximum temperature of 5 min, and the pressing pressure was constant throughout the process and was 50.4 MPa.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Hf-C-N ceramics by spark plasma sintering

Zavjalov¹,

Papynov²,

Shichalin³

et al. 2019

EPJ Web Conf.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Hf-C-N ceramics by spark plasma sintering

Zavjalov¹,

Papynov²,

Shichalin³

et al. 2019

EPJ Web Conf.

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“…Increasing the thickness of the hafnium oxide on the surface and in the near-surface region simultaneously with the removal of the SiO 2 -based melt leads to difficulties in dissipating the heat input into the sample volume (with a corresponding gradual heating of the surface). The complete evaporation of the silicate melt from the surface and the formation of a kind of "thermal barrier layer" of hafnium oxide, as shown in experiments on the influence of high-enthalpy air flows on ultra-hightemperature ceramic ZrB 2 (HfB 2 )-SiC, leads to a sharp increase in the surface temperature from ~1750-1850 • C (depending on the influence conditions) to 2300-2800 • C-the socalled "temperature jump" effect [25,28,43,[59][60][61]. Presumably, this effect should also occur as a result of exposure to CO 2 plasma at slightly different temperatures.…”

Section: Thermochemical Effects Of Supersonic Carbon Dioxide Flow And...mentioning

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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“…Elsewhere, studies have been carried out on ultra-high-temperature ceramic materials based on ZrB 2 -SiC and HfB 2 -SiC [ 34 , 35 , 36 ] for use at ultra-high temperatures and oxidising environments of oxygen, the last property of which is enhanced by the introduction of silicon carbide [ 36 ]. These studies differ from the present study in their focus on the formation and behaviour of ceramics as opposed to the formation of SiC/Ti6Al4V(ELI composites.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Analysis of Low and High SiC Volume Fraction Additively Manufactured SiC/Ti6Al4V(ELI) Composites Based on the Best Process Parameters of Laser Power, Scanning Speed and Hatch Distance

Thamae,

Maringa,

du Preez

2024

Materials

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Silicon carbide (SiC) exhibits intriguing thermo-physical properties such as higher heat capacity and conductivity, as well as a lower density than Ti6Al4V(ELI). These properties make SiC a good candidate for the reinforcement of Ti6Al4V(ELI) with respect to its use as a heat shield in aero turbines to increase their efficiency. The traditional materials used in aircraft structures were required to have a combination of good mechanical properties such as strength, stiffness, and hardness and low weight, as well as low thermo-physical properties such as coefficient of thermal expansion (CTE) and thermal conductivity. The alloy Ti6Al4V(ELI) has a density of 4.45 g/cm3, which is lower than that of structural steel (7.4 g/cm3) and higher than that of aluminium (2.5 g/cm3). Lower density benefits light weighting. Aluminium is the lightest of the traditional materials used but has relatively low strength. The CTE of SiC of 4.6 × 10−6/K is lower than that of Ti6Al4V(ELI) of 8.6 × 10−6/K, while the density of SiC of 3.21 g/cm3 is lower than that of Ti6Al4V(ELI) of 4.45 g/cm3. Therefore, from the theory of composites, SiC/Ti6Al4V(ELI) composites are expected to have lower densities and CTEs than those of Ti6Al4V(ELI), thus providing for lightweighting and less thermal related buckling or separation at their joints with carbon/epoxy resin panels. The specific strength, stiffness, and Knoop hardness of SiC of 75–490 kNm/kg, 132 MNm/kg, and 600–3800 GPa, respectively, are generally larger than those of Ti6Al4V(ELI) of 211 KNm/kg, 24 MNm/kg, and 880 GPa, respectively. Therefore, investigating reinforcement of Ti6Al4V(ELI) with SiC particles is worthwhile as it will lead to the formation of composites that are stronger, stiffer, harder, and lighter, with lower values of CTE. For additive manufacturing, this requires initial studies to optimise the process parameters of laser power and scanning speed for single tracks. To print single tracks in the present work, different laser powers ranging from 100 W to 350 W and scanning speeds ranging from 0.3 m/s to 2.7 m/s were used for different SiC volume fraction values of values. To print single layers, different values of hatch distance were used together with the best values of laser power and scanning speed determined elsewhere by the authors for different volume fractions of SiC. Through optical microscopy, the built tracks and their cross sections were examined. By using laser power and scanning speeds of 200 W and 1.2 m/s, and 150 W and 0.8 m/s, respectively, the best tracks at 5% and 10% volume fractions were obtained, whereas the best tracks at 25% volume fraction were achieved using a laser power of 200 W and a scanning speed of 0.5 m/s. Furthermore, the results showed that the maximum SiC volume percentage of 30% resulted in limited or no penetration. Therefore, it is concluded from the study that parts with improved mechanical properties can be produced at SiC volume fractions ranging from 5% to 25%, while parts produced at the high volume fraction of 30 % would have unacceptable mechanical qualities for the final part.

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Behavior of HfB2-SiC (10, 15, and 20 vol %) ceramic materials in high-enthalpy air flows

Cited by 32 publications

References 39 publications

Synthesis of Hf-C-N ceramics by spark plasma sintering

Synthesis of Hf-C-N ceramics by spark plasma sintering

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

A Comparative Analysis of Low and High SiC Volume Fraction Additively Manufactured SiC/Ti6Al4V(ELI) Composites Based on the Best Process Parameters of Laser Power, Scanning Speed and Hatch Distance

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