Spark plasma sintering of TiC–SiCw ceramics

Asl, Mehdi Shahedi; Ahmadi, Zohre; Namini, Abbas Sabahi; Babapoor, Aziz; Motallebzadeh, Amir

doi:10.1016/j.ceramint.2019.06.236

Cited by 94 publications

(15 citation statements)

References 84 publications

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“…Non-stoichiometric TiC x is considered as a challenging material, which its mechanical and electrical properties are governed by the value of x, varying within the range of 0.5-1 [29]. Based on this fact, the non-stoichiometric TiC x could show different morphology, bulk modulus, hardness, densification behavior, and grain size depending on the C/Ti ratio [30]. The crystalline lattice of TiC x is NaCl-type (B1) and carbon atoms have placed at the octahedral positions, while the face-centered spots are occupied by the titanium atoms.…”

Section: Phase Assessment and Sinterabilitymentioning

confidence: 99%

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Jafargholinejad

Soheyl

2021

Synth. Sinter.

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Five carbonaceous nano-additives (graphite, graphene, carbon black, carbon nanotubes, and diamond) had different impacts on the sinterability, microstructural evolution, and properties of titanium carbide. In this research, the sintering by spark plasma was employed to produce the monolithic TiC and carbon-doped ceramics under the sintering parameters of 1900 ºC, 10 min, 40 MPa. The carbon black additive had the best performance in densifying the TiC, thanks to its fine particle size, as well as its high chemical reactivity with TiO2 surface oxide. By contrast, the incorporation of nano-diamonds resulted in a considerable decline in the relative density of TiC owing to the graphitization phenomenon, together with the gas production at high temperatures. Although carbon precipitation from the TiC matrix occurred in all samples, some of the added carbonaceous phases promoted this phenomenon, while the others hindered it to some extent. Amongst the introduced additives, carbon black had the most contribution to grain refining, so that a roughly halved average grain size was attained in comparison with the undoped specimen. The highest values of hardness (3233 HV0.1 kg), thermal conductivity (25.1 W/mK), and flexural strength (658 MPa) secured for the ceramic incorporated by 5 wt% nano carbon black.

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Section: Phase Assessment and Sinterabilitymentioning

confidence: 99%

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Jafargholinejad

Soheyl

2021

Synth. Sinter.

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“…When the hardness of the second phase is higher than that of the matrix material, the hardness of the composites will increase. 20,21 However, when the SiCw content exceeds 0.5 wt%, the HV of the cermets decreases mainly due to the decrease in the relative density and the increase in the porosity. 22,23 The interfacial bonding strength between the hard phase and the binder phase decreases with decreasing relative density and increasing porosity.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Zhang

et al. 2021

Int J Applied Ceramic Tech

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Mo2NiB2 is a kind of cermet with excellent mechanical properties, stable chemical properties, and excellent corrosion resistance and is often used in wear‐resistant application fields, such as injection molding machine parts, can making tools and hot copper extruding dies. The brittleness of Mo2NiB2‐based cermets limits their wide application. Mo2NiB2‐based cermets were prepared by the vacuum sintering method, the effect of SiC whiskers (SiCw) on the microstructure and mechanical properties of cermets was investigated, and the toughening mechanism of SiCw on cermets was further discussed. The results indicate that with increasing SiCw content, the indentation fracture toughness (KIC), transverse fracture strength (TRS), and Vickers hardness (HV) of the cermets first increase and then decrease. The HV, TRS, and indentation fracture toughness of Mo2NiB2‐based cermets with 0.5 wt% SiCw are 1 113 HV, 1 620 MPa, and 27.97 MPa·m1/2, respectively, which are 16.8%, 22.7%, and 25% higher than those without SiCw. In the sliding friction tests, Mo2NiB2‐based cermets with 0.5 wt% SiCw have the smallest friction coefficient, low wear rate, and high wear resistance. SEM observation and analysis of the crack path and fracture surface showed that the toughening mechanism is whisker bridging, crack deflection, microcrack toughening, and whisker pull‐out. The results indicate that the addition of 0.5 wt% SiCw can effectively improve the mechanical properties of Mo2NiB2‐based cermets and further expand the application space of Mo2NiB2‐based cermets.

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“…Shahedi Asl et al reported that the relative density of the TiC-SiC composite increased from 99.23% to >100% when the SiC w content was increased from 0 to 30 vol. %, sintered by SPS [46].…”

Section: Sic Effect On Densification and Mechanical Propertiesmentioning

confidence: 99%

Effect of SiC on Microstructure, Phase Evolution, and Mechanical Properties of Spark-Plasma-Sintered High-Entropy Ceramic Composite

Zhang¹,

Akhtar²

2020

Ceramics

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Ultra-high temperature ceramic composites have been widely investigated due to their improved sinterability and superior mechanical properties compared to monolithic ceramics. In this work, high-entropy boron-carbide ceramic/SiC composites with different SiC content were synthesized from multicomponent carbides HfC, Mo2C, TaC, TiC, B4C, and SiC in spark plasma sintering (SPS) from 1600 °C to 2000 °C. It was found that the SiC addition tailors the phase formation and mechanical properties of the high-entropy ceramic (HEC) composites. The microhardness and fracture toughness of the HEC composites sintered at 2000 °C were improved from 20.3 GPa and 3.14 MPa·m1/2 to 26.9 GPa and 5.95 MPa·m1/2, with increasing SiC content from HEC-(SiC)0 (0 vol. %) to HEC-(SiC)3.0 (37 vol. %). The addition of SiC (37 vol. %) to the carbide precursors resulted in the formation of two high-entropy ceramic phases with two different crystal structures, face-centered cubic (FCC) structure, and hexagonal structure. The volume fraction ratio between the hexagonal and FCC high-entropy phases increased from 0.36 to 0.76 when SiC volume fraction was increased in the composites from HEC-(SiC)0 to HEC-(SiC)3.0, suggesting the stabilization of the hexagonal high-entropy phase over the FCC phase with SiC addition.

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Spark plasma sintering of TiC–SiCw ceramics

Cited by 94 publications

References 84 publications

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers

Effect of SiC on Microstructure, Phase Evolution, and Mechanical Properties of Spark-Plasma-Sintered High-Entropy Ceramic Composite

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Spark plasma sintering of TiC–SiCw ceramics

Cited by 94 publications

References 84 publications

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Preparation and toughening mechanism of Mo2NiB2‐based cermets with SiC whiskers

Effect of SiC on Microstructure, Phase Evolution, and Mechanical Properties of Spark-Plasma-Sintered High-Entropy Ceramic Composite

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Preparation and toughening mechanism of Mo₂NiB₂‐based cermets with SiC whiskers