Conditions for fabricating single-phase (Ta, Zr)C carbide by SHS from mechanically activated reaction mixtures

Курбаткина, В. В.; Пацерa, Е. И.; Vorotilo, S.; Левашов, Е. А.; Тимофеев, А. Н.

doi:10.1016/j.ceramint.2016.06.207

Cited by 16 publications

(8 citation statements)

References 23 publications

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“…Consequently, solid solutions in the Me 5 -Me 4 -C systems, where Me 5 and Me 4 are metals of the 4'th and 5'th group of the Periodic table, have attracted broad attention. Solid solutions (mostly with the composition Ta0.8Zr0.2C and Ta0.8Hf0.2C) have been produced by hot-pressing of the mixture of monocarbide powders, sol-gel synthesis with the subsequent annealing, carbothermal co-reduction of the mixture of corresponding oxides and by self-propagating high-temperature synthesis (SHS), which is also known as combustion synthesis [16][17][18]. In comparison with the stoichiometric carbides, solid solutions have several advantages.…”

Section: Introductionmentioning

confidence: 99%

Ab-initio modeling and experimental investigation of properties of ultra-high temperature solid solutions TaxZr1-xC

Vorotilo

Sidnov

Mosyagin

et al. 2019

Journal of Alloys and Compounds

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Due to their high melting temperature, high-temperature oxidation resistance and outstanding mechanical properties, solid solutions TaxZr1-xC are a promising ultra-high temperature ceramic (UHTC). However, the accelerated knowledge-based development of UHTCs solid solutions requires reliable data regarding the properties of the solution phases in the whole interval of concentrations. In particular, there are contradictory reports regarding the existence of the miscibility gap in Ta-Zr-C system at the temperatures below 900 o С. In this work, we carry out the ab-initio calculation of the thermodynamic properties of TaxZr1-xC alloys and demonstrate that the decomposition of the solid solutions into TaC and ZrC should not occur. We synthesize single-phase specimens with the composition TaxZr1-xC (x=0.9, 0.8, 0.6, 0.3) by self-propagating hightemperature synthesis (SHS) and anneal it for 40 hours. We do not observe any sign of the decomposition of the solid solution during the annealing, corroborating the conclusions obtained in theoretical simulations.

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Section: Introductionmentioning

confidence: 99%

Ab-initio modeling and experimental investigation of properties of ultra-high temperature solid solutions TaxZr1-xC

Vorotilo

Sidnov

Mosyagin

et al. 2019

Journal of Alloys and Compounds

Self Cite

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“…Instrumental indentation method was used to measure the mechanical properties of the consolidated samples. It is evident that the SPS specimens show higher properties …”

Section: Ta–hf–c Systemmentioning

confidence: 97%

“…In this case, ZrO 2 reacts with C and forms ZrC (reaction 12), and the latter participates in the formation of complex carbide (Ta,Zr)C (reaction 13). Using this approach, single‐phase complex carbide (Ta,Zr)C with 17.5 at% of ZrC in the solid solution and lattice parameter of 0.4493 was produced (Figure ) …”

Section: Ta–zr–c Systemmentioning

confidence: 99%

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SHS Processing and Consolidation of Ta–Ti–C, Ta–Zr–C, and Ta–Hf–C Carbides for Ultra‐High‐Temperatures Application

et al. 2018

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This review addresses the structure and phase formation mechanisms of self-propagating high-temperature synthesis (SHS) of single-phase complex carbides Ta-Ti/Zr/Hf-C, as well as the consolidation of synthesized carbides by various sintering methods. Properties of the synthesized and consolidated complex carbides are described, and unique advantages of SHS method for the synthesis of ultra-high temperature complex single-phase carbides are highlighted.

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“…Transition metal carbides TaC, HfC and ZrC, are the most promising candidates for ultra-high temperature ceramic (UHTC) materials for the aerospace industry. They not only have extremely high melting temperature, high hardness, high modulus, high electrical conductivity, corrosion resistance and excellent chemical stability, but also have strong covalent bonds and low self-diffusion coefficients [1][2][3][4][5]. But this also makes them difficult to sinter.…”

Section: Introductionmentioning

confidence: 99%

Structural stability, hardness, fracture toughness and melting points of Ta1-xHfxC and Ta1-xZrxC ceramics from first-principles

Zhang

Liu

Yan

et al. 2020

Preprint

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We systematic investigated the influence of substitution of Hf and Zr atoms for Ta atoms in TaC using first-principles supercell (SC) method and virtual crystal approximation (VCA) methods, including the impurity formation energy, lattice constant, volume, elastic constants, elastic moduli, melting points, fracture toughness and density of states of the Ta 1-x Hfx C and Ta1-x Zrx C ceramics in the whole range of content 0≤ x ≤1. Our calculated results show that the stability of Ta 1-x Hf x C and Ta 1-x Zrx C increases with the increase of Hf and Zr content, and Ta1-x Zrx C is more stable than Ta1-x Hfx C at the same content of Hf and Zr. The lattice constants and volumes dilate with the increase of Hf and Zr content. Furthermore, Ta1-x Hfx C and Ta1-x Zrx C carbides are mechanically stable and brittle. The bulk modulus of Ta1-x Hfx C and Ta1-x Zrx C decreases with the increasing content of Hf and Zr. Moreover, the hardness, fracture toughness, and melting point of Ta1-x Hf x C and Ta1-x Zrx C solid solutions have the peak. In particular, Ta0.8Hf0.2C has the highest hardness, largest fracture toughness and highest melting temperature.

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Conditions for fabricating single-phase (Ta, Zr)C carbide by SHS from mechanically activated reaction mixtures

Cited by 16 publications

References 23 publications

Ab-initio modeling and experimental investigation of properties of ultra-high temperature solid solutions TaxZr1-xC

Ab-initio modeling and experimental investigation of properties of ultra-high temperature solid solutions TaxZr1-xC

SHS Processing and Consolidation of Ta–Ti–C, Ta–Zr–C, and Ta–Hf–C Carbides for Ultra‐High‐Temperatures Application

Structural stability, hardness, fracture toughness and melting points of Ta1-xHfxC and Ta1-xZrxC ceramics from first-principles

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