Strength and toughness: The challenging case of TaC-based composites

Silvestroni, L.; Pienti, L.; Guicciardi, Stefano; Sciti, Diletta

doi:10.1016/j.compositesb.2014.11.043

Cited by 58 publications

(32 citation statements)

References 22 publications

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“…These large residual compressive stresses developed in matrix may lead to a substantial increase in fracture toughness. Similar situation was observed in TaC-based 24) ceramics and lead to reasonable increase in fracture toughness from 3.66 to 4. …”

Section: ¹1supporting

confidence: 80%

Consolidation of B4C–VB2 eutectic ceramics by spark plasma sintering

Demirskyi

Sakka

Vasylkiv

2015

J. Ceram. Soc. Japan

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The in situ synthesis and consolidation of B 4 CVB 2 eutectic composites by spark plasma sintering (SPS) is reported. The microstructure properties were determined for composites with the B 4 CVB 2 eutectic composition as functions of the VB 2 content and the VB 2 VB 2 interlamellar spacing. A change of VB 2 concentration from 45 to 48 mol.% resulted in the formation of the rodlike eutectic microstructure. Indentation fracture toughness values higher than 4 MPa·m 1/2 were identified for eutectic composites with interlamellar spacings between 0.9 and 1.2¯m. The composites obtained by SPS with a composition of 45 mol.% VB 2 exhibited a lower Vickers hardness (2324 GPa) and higher indentation fracture toughness (up to 4.5 MPa·m 1/2 ) than the eutectic composites with 48 mol.% of VB 2 .

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Section: ¹1supporting

confidence: 80%

Consolidation of B4C–VB2 eutectic ceramics by spark plasma sintering

Demirskyi

Sakka

Vasylkiv

2015

J. Ceram. Soc. Japan

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“…Zhong et al 22) observed pullout of the TaC grains after fracturing indicating a weakened bonding between the TaC grains which instead favored toughening mechanisms such as interface debonding and crack deflection. Silvestroni et al 24) also observed an increase in fracture toughness of 28% when 15 vol.% TaSi 2 was added to the TaC matrix, which was a result of the composite matrix being under a compressive stress. Hence, our finding are consistent with the same although with a novel high load (500 N) instrumented indentation technique on TaCNbC based ceramics.…”

Section: Mechanical Properties By High Load Instrumented Indentationmentioning

confidence: 94%

TaC–NbC formed by spark plasma sintering with the addition of sintering additives

Rudolf

Agarwal

Boesl

2016

J. Ceram. Soc. Japan

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TaCNbC with and without the addition of 5 vol.% B 4 C and 5 vol.% Si nano-powders as sintering aids were consolidated by spark plasma sintering at 1850°C. The effect of sintering aid addition on the densification and mechanical properties is evaluated along with secondary phase formations. Relative density >99% is achieved with a hold time of just 3 min for the addition of Si and 10 min for the addition of B 4 C as sintering additives. High load instrumented indentation was performed and projected area of residual damage is compared to estimate relative fracture toughness. The addition of 5 vol.% Si as a sintering additive resulted in a 46% reduction in projected residual damage area and 14.5% more energy dissipation during indentation than the sample with 5 vol.% B 4 C as the sintering additive resulting in a higher overall toughness.

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“…UHTCs are materials with melting points above 3300 K. Due to their high melting points, transition‐metal carbides and borides are classified as UHTCs . Among the UHTCs, tantalum carbide (TaC) and hafnium carbide (HfC) are of particular interest due to their extremely high melting points (~4000 K) which are the highest of any inorganic material. Recently, experimental and theoretical investigations have reported the excellent elastic and mechanical features of TaC and HfC, which determine their suitability as structural materials …”

Section: Introductionmentioning

confidence: 99%

Bond characteristics, mechanical properties, and high‐temperature thermal conductivity of (Hf_1−xTa_x)C composites

et al. 2019

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Bond characteristics, mechanical properties, and high‐temperature thermal conductivity of ultrahigh‐temperature ceramics (UHTCs), hafnium carbide (HfC), tantalum carbide (TaC), and their solid solution composites, were investigated using first‐principles calculations. Mulliken analyses revealed that Ta formed stronger covalent bonds with C than did Hf. Bond overlap analyses indicated that the Hf–C bond possessed mixed covalent and ionic bond characteristics, compared with the more covalent character of the Ta–C bond. Consequently, the overall elastic properties were enhanced with increasing number of Ta–C bonds in the composites. The overall metallicity of the composites also increased with increasing TaC content; thus, the mechanical properties did not improve monotonically. Our results indicate that adding a small amount of TaC to HfC or vice versa to produce a composite would create a new UHTC with greatly improved elastic and mechanical properties as well as high‐temperature thermal conductivity.

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Strength and toughness: The challenging case of TaC-based composites

Cited by 58 publications

References 22 publications

Consolidation of B<sub>4</sub>C–VB<sub>2</sub> eutectic ceramics by spark plasma sintering

Consolidation of B<sub>4</sub>C–VB<sub>2</sub> eutectic ceramics by spark plasma sintering

TaC–NbC formed by spark plasma sintering with the addition of sintering additives

Bond characteristics, mechanical properties, and high‐temperature thermal conductivity of (Hf_1−xTa_x)C composites

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Strength and toughness: The challenging case of TaC-based composites

Cited by 58 publications

References 22 publications

Consolidation of B<sub>4</sub>C&ndash;VB<sub>2</sub> eutectic ceramics by spark plasma sintering

Consolidation of B<sub>4</sub>C&ndash;VB<sub>2</sub> eutectic ceramics by spark plasma sintering

TaC&ndash;NbC formed by spark plasma sintering with the addition of sintering additives

Bond characteristics, mechanical properties, and high‐temperature thermal conductivity of (Hf1−xTax)C composites

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Consolidation of B<sub>4</sub>C–VB<sub>2</sub> eutectic ceramics by spark plasma sintering

Consolidation of B<sub>4</sub>C–VB<sub>2</sub> eutectic ceramics by spark plasma sintering

TaC–NbC formed by spark plasma sintering with the addition of sintering additives

Bond characteristics, mechanical properties, and high‐temperature thermal conductivity of (Hf_1−xTa_x)C composites