Tantalum Carbides

Shabalin, Igor L.

doi:10.1007/978-94-024-1302-1_2

Cited by 4 publications

(3 citation statements)

References 540 publications

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“…HEC 1− x ceramics with nominal carbon vacancy concentrations of 10%, 20%, 30%, 40%, and 50% have lattice constants of 4.5109, 4.5103, 4.5023, 4.4919, and 4.4887 Å, respectively. Figure 2 shows the normalized lattice constants a / a 0 of these HEC 1− x ceramics and the corresponding nonstoichiometric monocarbides reported in literature 4‐6,35‐48 . It can be seen that the decrease rate of a / a 0 obeys a sequence as TaC 1− x ≈ NbC 1− x < HEC 1− x ≈ ZrC 1− x ≈ HfC 1− x < TiC 1− x when the carbon vacancy concentration increases.…”

Section: Resultsmentioning

confidence: 89%

Lattice rigidity in high‐entropy carbide ceramics with carbon vacancies

Liu

Guo

et al. 2023

J Am Ceram Soc.

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Due to the presence of core effects of high‐entropy materials, it is believed that the impact of carbon vacancy in high‐entropy carbides may differ from that of transition metal monocarbides. In this work, nonstoichiometric high‐entropy carbides (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C1−x (HEC1−x) with variable carbon vacancy concentration were fabricated by spark plasma sintering using powder mixtures of high‐entropy carbide and metallic powders. Compared with the corresponding monocarbides, the decline rates of lattice constant and elastic modulus were obviously slower as carbon vacancy concentration increased, indicating a more rigid crystalline lattice in the high‐entropy carbide. The valence electron number for HEC1−x ceramics with the highest hardness is 7.6, which is inconsistent with the theoretically predicted value of 8.4 for the traditional transition metal carbides. When the carbon vacancy concentration in HEC1−x ceramics is above 20%, the promoting effect of carbon vacancy on grain growth will outweigh the inhibiting effect of sluggish diffusion on grain growth, causing grains to grow quickly.

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Section: Resultsmentioning

confidence: 89%

Lattice rigidity in high‐entropy carbide ceramics with carbon vacancies

Liu

Guo

et al. 2023

J Am Ceram Soc.

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“…Transition metal carbides are extensively used in industries owing to their high thermal and chemical stability, appropriate mechanical properties, wear resistance, and catalytic performance [1,2]. Various carbides are used to produce both bulk products and coatings, but the complexity and high cost of the production technologies obstruct their potential use.…”

Section: Introductionmentioning

confidence: 99%

Wet Ball Milling Applied to Production of Composites and Coatings Based on Ti, W, and Nb Carbides

Eryomina

Lomayeva

2023

Powders

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The paper demonstrates the potential of wet ball milling of metals for the synthesis of various carbides and carbohydrides. The work reports on multicomponent carbides formed in Ti-(Cu/Fe/Si)-C, W-Fe-C, and Nb-(Cu/Fe/Si/Al)-C systems, as well as metastable or high-temperature intermetallics formed in Ti-Si, Nb-Si, Nb-Al, and Nb-Cu-Fe systems, which are stabilized with interstitial carbon. The formation of phase composition of powders fabricated under mechanochemical synthesis and subsequent thermal treatment has been studied. The as-fabricated powders have been used to produce bulk compacts and to apply wear-resistant coatings on steel (iron).

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“…Для получения ультратугоплавкой керамики применяются карбиды, нитриды и бориды переходных металлов IV и V групп с температурой плавления, превышающей 3300 К. Наиболее тугоплавкими в этой группе являются карбиды, где HfC и ZrC обладают температурой плавления 3973-4033 и 3733-3763 K соответственно [5]. Особенностью этих карбидов является образование непрерывного ряда твердых растворов [6], физикомеханические свойства которых превосходят характеристики монокарбидов [7,8].…”

Section: Introductionunclassified

Exothermic synthesis of binary solid solutions based on hafnium and zirconium carbides

Щербаков

Gryadunov

Алымов

2021

Izv. VUZ. Poroshk. Met.

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The paper presents the results of an experimental study into the possibility of producing ultra-high temperature ceramics constituting solid solutions of HfC and ZrC carbides by the single-stage electro-thermal explosion (ETE) method under pressure. Adiabatic flame temperature and phase composition of the equilibrium final product were calculated based on thermodynamic data. It was shown that when the ZrC content in the final product is less than 20 wt.%, adiabatic flame temperature reaches 3800– 3900 K, and the combustion product contains hafnium and zirconium carbides. The effect of mechanical activation modes in an AGO-2 planetary centrifugal mill used for a reaction mixture containing Hf, Zr and C powders on its properties, phase composition formation and the microstructure of carbide solid solutions was studied. It was shown that high-energy mixing in hexane leads to the destruction of the crystal structure of Hf and Zr particles and the formation of amorphous composite particles. The synthesized samples of ultra-high temperature ceramics were studied by X-ray phase and microstructure analyzes. It was shown that exothermic synthesis leads to the formation of single-phase solid solutions of HfC and ZrC carbides with the average particle size of 0.2–1.5 μm. The residual porosity of the binary carbides obtained is 10–12 %. It was found that, despite the high temperature of sample heating during ETE under pressure, the particle size of the resulting solid solutions is significantly (by an order of magnitude) smaller than the particle size of similar complex carbides (20–50 μm) obtained by other methods (SPS and hot pressing). This is associated with the rapidity of the exothermic interaction of the reagents (10–50 ms) during ETE.

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Tantalum Carbides

Cited by 4 publications

References 540 publications

Lattice rigidity in high‐entropy carbide ceramics with carbon vacancies

Lattice rigidity in high‐entropy carbide ceramics with carbon vacancies

Wet Ball Milling Applied to Production of Composites and Coatings Based on Ti, W, and Nb Carbides

Exothermic synthesis of binary solid solutions based on hafnium and zirconium carbides

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