Fabrication of ultra-high-temperature nonstoichiometric hafnium carbonitride via combustion synthesis and spark plasma sintering

Suvorova, Veronika; Непапушев, А. А.; Moskovskikh, Dmitry; Трусов, Г. В.; Kuskov, Kirill; Вадченко, С. Г.; Rogachev, A. S.; Mukasyan, Alexander S.

doi:10.1016/j.ceramint.2020.03.158

Cited by 44 publications

(18 citation statements)

References 32 publications

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“…In particular, the much progress had been reached for the triple system of (HfC x N y ). In accordance with recent publication [2], the scientists could obtain the HfC 0.5 N 0.35 compound. This compound is a very closed to theoretical calculated one and has a melting temperature of 4200 о С and hardness of 21,3 GPa.…”

Section: Introductionsupporting

confidence: 68%

“…Here: С = 0.050 is the constant found from experiment [2]. By using of (6)-(9) the Debye temperature and melting temperature are calculated for carbonitride hafnium Hf 6 C 3 N 2 , respectively:  D = 304K и T m = = 4414K (4141 o C).…”

Section: Calculation Of Energy Mechanic and Thermodynamic Parametersmentioning

confidence: 99%

“…At present, in many counties there have been carried out intensive experimental and theoretical investigations solid compounds based on niobium, tantalum and carbonitride hafnium [1,2]. In particular, the much progress had been reached for the triple system of (HfC x N y ).…”

Section: Introductionmentioning

confidence: 99%

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COMPUTER MODELLING OF A VERY HEAT RESISTANT Hf6C3N2 FOR COVER OF HYPERSONIC FLIGHT VEHICLES

Bayramov

Gasanov²

2020

A.I.S.

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Section: Introductionsupporting

confidence: 68%

Section: Calculation Of Energy Mechanic and Thermodynamic Parametersmentioning

confidence: 99%

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COMPUTER MODELLING OF A VERY HEAT RESISTANT Hf6C3N2 FOR COVER OF HYPERSONIC FLIGHT VEHICLES

Bayramov

Gasanov²

2020

A.I.S.

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“…Transition metal nitrides and carbonitrides are used for their high hardness, wear resistance, and refractory character—having melting temperatures over 1800 °C 17 , with some having melting temperatures above 4000 °C 18 . High-entropy versions of these materials show potential to augment their already high hardness and thermal stability, making them promising candidates for leading edges and thermal protective components in aerospace applications, which require bulk materials 19 .…”

Section: Introductionmentioning

confidence: 99%

Bulk high-entropy nitrides and carbonitrides

Dippo

Mesgarzadeh

Harrington

et al. 2020

Sci Rep

108

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High-entropy ceramics have potential to improve the mechanical properties and high-temperature stability over traditional ceramics, and high entropy nitrides and carbonitrides (HENs and HECNs) are particularly attractive for high temperature and high hardness applications. The synthesis of 5 bulk HENs and 4 bulk HECNs forming single-phase materials is reported herein among 11 samples prepared. The hardness of HENs and HECNs increased by an average of 22% and 39%, respectively, over the rule-of-mixtures average of their monocarbide and mononitride precursors. Similarly, elastic modulus values increased by an average of 17% in nitrides and 31% in carbonitrides over their rule-of-mixtures values. The enhancement in mechanical properties is tied to an increase in the configurational entropy and a decrease in the valence electron concentration, providing parameters for tuning mechanical properties of high-entropy ceramics.

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“…Ultra-High Temperature Ceramics (UHTCs) based on transition metal borides, carbides, nitrides, carbonitrides, etc., possess a combination of desirable chemico-physical and mechanical properties (melting point above 3000 °C, high hardness, low density, chemical inertness, good electrical and thermal conductivity, low neutron absorption, selective solar energy absorption, etc.) which makes them candidate materials to operate under severe environments like in the aerospace as well as other innovative and traditional fields [1][2][3][4][5]. Such potential promoted a significant effort by several research groups in the last two decades to: a) identify suitable synthesis/consolidation methods for the obtainment of various members of this materials family, and b) characterize in detail the resulting products.…”

Section: Introductionmentioning

confidence: 99%

Processing Conditions Optimization for the Synthesis and Consolidation of High-Entropy Diborides

Barbarossa

Murgia

Orrù

et al. 2021

Eurasian Chem. Tech. J.

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The fabrication by Spark Plasma Sintering (SPS) of bulk high entropy ceramics from powders obtained by Self-propagating High temperature Synthesis (SHS) is addressed in this work. The effect produced by the introduction of 1 wt.% of graphite to the powders before SPS is investigated under different temperature conditions. The final density and composition of sintered (Hf0.2Mo0.2Zr0.2Ti0.2Ta0.2)B2 and (Hf0.2Mo0.2Zr0.2Ti0.2Nb0.2)B2 ceramics are found to be negatively affected by the presence of oxide impurities in the powders. While product composition can be progressively improved when the temperature is increased from 1800 to 1950 °C, residual porosities remain relatively high if using additive-free powders. In contrast, the introduction of 1 wt.%C markedly allows for oxides elimination by carbothermal reduction mechanism. Products consolidation is correspondingly enhanced so that relative densities of about 97% are attained. Other than the latter effect, surface oxides removal also makes powders more reactive, thus the synthesis of single-phase products is promoted. In particular, fully homogeneous (Hf0.2Mo0.2Zr0.2Ti0.2Ta0.2)B2 ceramics are obtained at relatively lower temperature conditions (1850 °C).

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Fabrication of ultra-high-temperature nonstoichiometric hafnium carbonitride via combustion synthesis and spark plasma sintering

Cited by 44 publications

References 32 publications

COMPUTER MODELLING OF A VERY HEAT RESISTANT Hf6C3N2 FOR COVER OF HYPERSONIC FLIGHT VEHICLES

COMPUTER MODELLING OF A VERY HEAT RESISTANT Hf6C3N2 FOR COVER OF HYPERSONIC FLIGHT VEHICLES

Bulk high-entropy nitrides and carbonitrides

Processing Conditions Optimization for the Synthesis and Consolidation of High-Entropy Diborides

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