Microstructure, mechanical properties and oxidation behavior of TaC- and HfC-based materials containing short SiC fiber

Pienti, L.; Silvestroni, L.; Landi, Elena; Melandri, Cesare; Sciti, Diletta

doi:10.1016/j.ceramint.2014.09.070

Cited by 35 publications

(13 citation statements)

References 30 publications

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“…As displayed in The hardness of material influences its application largely, especially as abrasive phase [26]. It is also concerned with other mechanical properties such as bending strength, compressibility, toughness and wear resistance [27,28]. The Vickers hardness of these compounds can be evaluated within the following forms [29]:…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Elastic and thermodynamic properties of Mo2C polymorphs from first principles calculations

Liu

Jiang

Zhou

et al. 2015

Ceramics International

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Section: Mechanical Propertiesmentioning

confidence: 99%

Elastic and thermodynamic properties of Mo2C polymorphs from first principles calculations

Liu

Jiang

Zhou

et al. 2015

Ceramics International

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“…9,10 High sintering temperatures do not secure higher densities because rapid growth of TaC grains always entraps residual pores, which are extremely hard to eliminate. [9][10][11] Addition of small particles, such as SiC, 12,13 TaB 2 , 14,15 TaSi 2 , 16 Si 3 N 4 , 17 and short fibers 17,18 could increase UHTCs densification. Using ultrafine TaC powders as starting material also facilitated densification.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of TaC ceramics with 1–7.5 mol% Si as sintering aid

et al. 2017

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Metallic Si as sintering aid was effective in densifying tantalum carbide ceramic (TaC) by spark plasma sintering (SPS) at 1700°C. Full density was reached at 5.0 mol% Si addition (equivalent to 1.088% Si in weight) and above. Enhanced densification of TaC ceramic with Si was associated with decrease in oxygen content from ~0.24 wt% in TaC powder to ~0.03 wt% in consolidated specimen. Rest of the oxygen species was collected at multigrain conjunctions to form SiO2‐based liquid at high temperatures. Upon cooling, Ta, Si, O, and C dissolving in the liquid precipitated minor phases of TaSix and SiC of low concentrations. Microstructure of TaC ceramics was refined by the Si addition, with average grain size decreasing from 11±8 μm at 1.0 mol% Si to 3±2 μm at 7.5 mol% Si addition. Ta solute in SiC and Si solute in TaC were evidenced. TaC ceramic containing 7.5 mol% Si had a relatively good flexural strength and fracture toughness of 646±51 MPa and 5.0 MPa·m1/2, respectively.

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“…As a result, fibre reinforcement has been examined in order to improve the damage tolerance of these materials [9][10] [11]. Among UHTCs, HfC shows the highest melting temperature (3900°C) and is interesting for high temperature applications [12] [13] [14] [15], but its high density (12.2 g/cm 3 ) and difficulty in achieving full density remain as issues for the fabrication of lightweight materials. In this regard, the addition of SiC or transition metal silicides helps reduce the overall density of the composites and promotes sintering [7] [16] [17] [18].…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, the addition of small amounts of SiC was reported to aid the densification of UHTCs via liquid phase sintering, by forming a liquid phase with the surficial oxides present on the powders [17] [26] [27] [28]. Additionally SiC improves the oxidation resistance up to 1650°C owing to the formation of a viscous silica layer on the surface and allowing the formation of a compact HfO2 scale [15] [21][29] [30].…”

Section: Introductionmentioning

confidence: 99%

Influence of fibre content on the strength of carbon fibre reinforced HfC/SiC composites up to 2100 °C

Vinci

Zoli

Sciti

et al. 2019

Journal of the European Ceramic Society

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The influence of carbon fibre content on the mechanical behaviour of HfC/SiC composites was investigated up to 2100°C for specimens containing 40 or 55 vol% fibres. Silicon carbide was added as a sintering aid during hot pressing. Increasing the fibre content made infiltration more difficult, which resulted in higher porosity in the specimen with 55 vol% fibres. The room temperature flexural strength ranged from 340 to 380 MPa, and it increased to more than 400 MPa at 1800°C due to stress relaxation. Increasing temperature was accompanied by a decrease in the slope of the load-displacement curve, indicating a decrease in elastic modulus, but plastic deformation was not observed below 2100°C. At 2100°C, the specimen containing a higher fibre content underwent significant deformation due to low interfacial strength between the fibre plies, retaining a strength at the proportional limit of 290 MPa and an ultimate strength of 520 MPa.

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Microstructure, mechanical properties and oxidation behavior of TaC- and HfC-based materials containing short SiC fiber

Cited by 35 publications

References 30 publications

Elastic and thermodynamic properties of Mo2C polymorphs from first principles calculations

Elastic and thermodynamic properties of Mo2C polymorphs from first principles calculations

Microstructure and mechanical properties of TaC ceramics with 1–7.5 mol% Si as sintering aid

Influence of fibre content on the strength of carbon fibre reinforced HfC/SiC composites up to 2100 °C

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