Effect of binder compositions on microstructure, hardness and magnetic properties of (Ta,Nb)C–Co and (Ta,Nb)C–Ni cemented carbides

Daoush, Walid M.; Park, Hee S.; Lee, Kyong H.; Moustafa, S.F.; Hong, Soon Hyung

doi:10.1016/j.ijrmhm.2008.10.017

Cited by 23 publications

(7 citation statements)

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“…These hardness values are of the same order of magnitude as those reported for cermets with similar binder contents [5,49]. A nearly constant value of approximately 14 GPa was obtained in the 20CoyG cermets, whereas a small decrease was observed in the 30CoyG cermets when the amount of graphite was increased.…”

Section: Mechanical Behavioursupporting

confidence: 82%

“…Typically, cermets consist of titanium carbide (TiC) or titanium carbonitride (Ti(C,N)) ceramic particles embedded in a Co/Ni metal alloy that acts as a binder [2][3][4][5]. Cermets combine the advantages of ceramics and metals [3]; the ceramic phase must mainly provide hardness and wear resistance, whereas the binder phase provides fracture strength and impact resistance [6].…”

Section: Introductionmentioning

confidence: 99%

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Toughening of complete solid solution cermets by graphite addition

Chicardi

Torres

Sayagués

et al. 2015

Chemical Engineering Journal

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Abstract(Ti 0.95 Ta 0.05 )(C 0.5 N 0.5 )-Co complete solid solution cermets (CSCs) were developed by a mechanochemical synthesis process and a pressureless sintering method. The effect of different percentages of graphite used as a sintering additive on the nature of the binder phase and the mechanical properties of the cermets was investigated. Microstructural and mechanical characterisations were carried out by X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, energydispersive X-ray spectroscopy, Vickers hardness, indentation fracture toughness and nanoindentation. The addition of graphite modified the carbon activity during sintering, reducing the dissolution of carbonitride ceramic particles into the molten binder. The amount of Ti and Ta remaining in the binder after sintering gradually decreased as the amount of graphite added increased, which induced a change in the nature of the binder phase. When no graphite was added, the binder consisted of the brittle Ti x Ta 1-x Co 2 intermetallic phase. With the increase in the amount of graphite added, the formation of more ductile phases, such as Ti x Ta 1-x Co 3 and -Co, was observed, causing a significant improvement in the toughness of the cermets.

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Section: Mechanical Behavioursupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Toughening of complete solid solution cermets by graphite addition

Chicardi

Torres

Sayagués

et al. 2015

Chemical Engineering Journal

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“…In the case of Al 2 O 3 short fibres /Ni composites, three factors can contribute to the lower readings in commercial laboratories: first, the Ni content; second, the lower saturation magnetization caused by any residual elements like phosphorus or oxygen that are separated or combined in the solid solution; and, third, the presence of Al 2 O 3 phase, which act as magnetic voids where opposing magnetic field can occur and in turn reduce the saturation values. 61,62 On the other hand, from the values of coercivity H c and retentivity M r decreased by increasing the Al 2 O 3 short fibres content. The influence of the Al 2 O 3 short fibres reinforcement phase as well as the Ni binder content on the coercivity and the retentivity can be explained by three reasons.…”

Section: Electrical Resistivitymentioning

confidence: 99%

Microstructure, physical properties and hardness of alumina short fibres/nickel matrix composites fabricated by powder technology

Daoush

Elkady

2013

Journal of Composite Materials

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Nickel matrix composites reinforced with different weight percent of alumina short fibres have been fabricated by powder technology route. The alumina short fibres were encapsulated by nickel layers using the electroless deposition technique. The produced alumina/nickel composite powders underwent cold compaction and sintering at 850℃. The alumina/nickel powders as well as the consolidated composites were investigated by optical microscope, scanning electron microscope, XRD and VSM. It was observed that the surface of the alumina short fibres was completely coated with nickel layer and the microstructures of the consolidated compacts show homogeneous distribution of the alumina short fibres in the nickel matrix. The density, electrical conductivity, coercivity, retentivity, saturation magnetization and hardness of the produced alumina short fibres/nickel composites were measured. The relative sintered density and the saturation magnetization were decreased, but the retentivity, the coercivity and the hardness were increased by increasing the alumina short fibres weight percent in the nickel matrix.

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“…This combination of techniques is certainly interesting since aqueous colloidal processing allows the challenging co-dispersion of the ceramic and metal phases in the form of environmentally-friendly suspensions with optimized rheological properties, whereas slip casting allows the subsequent near-net shaping of compacts demanded by industry. A Co binder offers some benefits over Ni binder, for example, in terms of hardness and corrosion resistance [24,25].…”

Section: Introductionmentioning

confidence: 99%