Core-rim structure formation in TiC-Ni based cermets fabricated by a combined thermal explosion/hot-pressing process

Lemboub, Samia; Boudebane, Saïd; Gotor, F.J.; Haouli, Saida; Mezrag, S.; Bouhedja, Samia; Hesser, Günter; Chadli, H.; Chouchane, T.

doi:10.1016/j.ijrmhm.2017.09.014

Cited by 23 publications

(6 citation statements)

References 29 publications

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“…On the other hand, mechanical properties of the B 4 C‐TiB 2 composite with similar composition were higher than those of B 4 C‐11.6 wt% TiB 2 ceramic material with 4.7 wt% Mo and 3 wt% C (hardness: 20.6 GPa and toughness: 3.82 MPa·m 1/2 ) 28,29 . The presence of the core‐rim structure could inhibit the grain growth and enhance the densification, by building a better wetting interface in the grain boundary therefore, the mechanical properties of the ceramics were improved in this work 39,49 …”

Section: Resultsmentioning

confidence: 91%

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Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive

et al. 2021

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B4C‐TiB2 ceramics (TiB2 ranging 5~70 vol%) with Mo‐Co‐WC as the sintering additive were prepared by spark plasma sintering. In comparison with B4C‐TiB2 without additive, the enhanced densification was evident in the sintered specimen with Mo‐Co‐WC additive. Core‐rim structured grain was observed around TiB2 grains. The interface of the rim between TiB2 and B4C phases demonstrated different feature: the inner borderline of the rim exhibited a smooth feature, whereas a sharp curved grain boundary was observed between the rim and the B4C grain. The formation mechanism is discussed: the epitaxial growth of (Ti,Mo,W)B2 rim around the TiB2 core may occur as a result of the solid solution and dissolution‐precipitation between TiB2 phase and the sintering additive. It was revealed that the fracture toughness increased as the content of TiB2 content increased, alongside the decreased hardness. B4C‐30 vol% TiB2 specimen demonstrated the optimal combination of mechanical properties, reaching Vickers hardness of 24.3 GPa and fracture toughness of 3.33 MPa·m1/2.

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Section: Resultsmentioning

confidence: 91%

“…GPa and toughness: 3.82 MPa•m 1/2 ) 28,29. The presence of the core-rim structure could inhibit the grain growth and enhance the densification, by building a better wetting interface in the grain boundary therefore, the mechanical properties of the ceramics were improved in this work 39,49. …”

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confidence: 93%

Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive

et al. 2021

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“…Moreover, the synthesis of the (TiZrHfNbTa)C powder has also been reported by a two-step process consisting of the carbothermal reduction of the single oxides at 1600 ºC, leading to the formation of the single carbides, followed by the solid solution formation after annealing at 1900-2000 ºC [14]. However, the extremely high temperatures required to synthesise HECs, besides inducing a high energy consumption, do not allow obtaining powders with the most adapted microstructure to be used in coatings technology or powder metallurgy processes [15]. Therefore, in this work, we present an alternative synthesis method for a novel powdered (TiZrHfVNb)C 5 HEC, which can be extended to other compositions including transition metals of the IVB and VB groups and tries to solve the limitations of the above-mentioned synthesis methods.…”

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confidence: 99%

Low temperature synthesis of an equiatomic (TiZrHfVNb)C5 high entropy carbide by a mechanically-induced carbon diffusion route

Chicardi

García-Garrido

Gotor

2019

Ceramics International

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“…HIPS does not need a mold, but the preparation efficiency is low. Compared with microwave sintering and HIPS, HPS can economically obtain highly dense materials, a uniform fine-grained microstructure, and excellent physical and mechanical properties with high reliability [ 14 ]. Thus, HPS has been widely used for sintering and developing various materials, including composite materials such as hard metals and cermets [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Mo2C Addition on the Tribological Behavior of Ti(C,N)-Based Cermets

Qiu

Pan

et al. 2023

Materials

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Due to the excellent properties of Ti (C,N)-based ceramics, such as high hardness, excellent wear resistance, exceptional thermal deformation resistance, and sound chemical stability, they have been widely used in cutting tools or molds. Thus, revealing their tribological behavior against hard materials is of great significance. Some studies have reported the tribological behavior of Ti(C,N)-based cermets and hard cermets, but so far, the effects of Mo2C additions on the frictional properties of Ti(C,N)-based cermets are still unclear. In this study, Ti(C,N)-10WC-1Cr3C2-5Co-10Ni-x Mo2C cermets (x = 4, 6, 8, 10 and 12 wt.%) were sintered using a vacuum hot-pressing furnace. Furthermore, the core–rim morphologies of the sintered samples were observed in SEM images. Then, the wear resistance of the cermets was studied against a Si3N4 ball at a 50 N load using the fretting wear test. Finally, the wear mechanism was characterized using a combination of SEM, EDS and XPS. The experimental results indicated that the wear mechanisms of the cermets were mainly abrasive wear, adhesive wear, and the formation of an oxide film. As the content of Mo2C increased from 4 wt.% to 12 wt.%, the friction coefficient and wear volume had a variation law of first decreasing and then decreasing, and reached minimum values at 6 wt.% and 12 wt.%, and the lowest friction coefficient and wear rate were 0.49 and 0.9 × 10−6 mm3/Nm, respectively. The 6 wt.% Mo2C greatly improved the hardness and fracture toughness of the cermet, while the 12 wt.% Mo2C promoted the formation of an oxide film and protected the friction surface. The cermet with 6 wt.% Mo2C is recommended because it has comprehensive advantages in terms of its mechanical properties, tribological properties, and cost.

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Core-rim structure formation in TiC-Ni based cermets fabricated by a combined thermal explosion/hot-pressing process

Cited by 23 publications

References 29 publications

Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive

Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive

Low temperature synthesis of an equiatomic (TiZrHfVNb)C5 high entropy carbide by a mechanically-induced carbon diffusion route

Effect of Mo2C Addition on the Tribological Behavior of Ti(C,N)-Based Cermets

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Core-rim structure formation in TiC-Ni based cermets fabricated by a combined thermal explosion/hot-pressing process

Cited by 23 publications

References 29 publications

Dense and core‐rim structured B4C‐TiB2 ceramics with Mo‐Co‐WC additive

Dense and core‐rim structured B4C‐TiB2 ceramics with Mo‐Co‐WC additive

Low temperature synthesis of an equiatomic (TiZrHfVNb)C5 high entropy carbide by a mechanically-induced carbon diffusion route

Effect of Mo2C Addition on the Tribological Behavior of Ti(C,N)-Based Cermets

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Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive

Dense and core‐rim structured B₄C‐TiB₂ ceramics with Mo‐Co‐WC additive