Monophasic Nanostructured Powders of Niobium, Tantalum, and Hafnium Carbonitrides Synthesized by a Mechanically Induced Self‐Propagating Reaction

Córdoba, J.M.; Sayagués, María Jesús; Alcalá, M.D.; Gotor, F.J.

doi:10.1111/j.1551-2916.2006.01395.x

Cited by 71 publications

(42 citation statements)

References 46 publications

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“…In a recent study [21], CSCs based on (Ti,Ta)(C,N) single phase were developed by exploiting the ability of the mechanochemical process referred to as mechanically induced self-sustaining reaction (MSR) [22] to yield homogeneous carbonitride solid solution powders [23][24][25]. This method uses the strong exothermic character of carbonitride formation from the starting materials to promote self-propagating reactions by the mechanical energy supplied by high-energy ball mills.…”

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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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: 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 many highly exothermic powder mixtures [4,5], ball milling can generate mechanically induced self-sustaining reactions (MSRs). An MSR process begins with an activation period, during which size reduction, mixing, and defect formation take place.…”

Section: Introductionmentioning

confidence: 99%

Influence of the milling parameters on the mechanical work intensity in planetary mills

et al. 2013

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The formation of ZnSe via a mechanically-induced self-sustaining reaction (MSR) from a Zn/Se mixture showed that only size reduction and mixing of the reactants without product formation occurred during the induction period prior to ignition. Therefore, all mechanical energy supplied by the planetary mill during this time, called the ignition time (t ig ), was used exclusively in the activation of the reactants. This system was chosen to study the dependence of t ig on the main parameters characterising the milling intensity of planetary mills. The variation of the ignition time with the process conditions reflected changes in the mechanical dose rate of the planetary mill. A direct relationship between the inverse of the ignition time and the power of the planetary mill was established, which allows the validation of theoretical models proposed in the literature for the energy transfer in milling devices and the comparison of milling equipment efficiencies.

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“…Córdoba et al [22][23][24] have shown that the mechanochemical process denoted as a mechanically induced self-sustaining reaction (MSR) is an affordable and reproducible manufacturing process used to obtain complex transition metal carbonitrides. This reactive milling method uses the strong exothermic character of the carbide and nitride formation from the elements to obtain complex carbonitrides with high purity and with good control of stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

Inverse core–rim microstructure in (Ti,Ta)(C,N)-based cermets developed by a mechanically induced self-sustaining reaction

Chicardi

Córdoba

Sayagués

et al. 2012

International Journal of Refractory Metals and Hard Materials

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Cermets with a nominal composition (Ti 0.8 Ta 0.2 C 0.5 N 0.5 -20 wt% Co) were synthesised by a mechanically induced self-sustaining reaction (MSR) process from stoichiometric elemental powder blends. The MSR allowed the production of a complex (Ti,Ta)(C,N) solid solution, which was the raw material used for the sintering process. The pressureless sintering process was performed at temperatures between 1400 ºC and 1600 ºC in an inert atmosphere. The microstructural characterisation showed a complex microstructure composed of a ceramic phase with an unusual inverse core-rim structure and a Ti-Ta-Co intermetallic phase that acted as the binder.

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Monophasic Nanostructured Powders of Niobium, Tantalum, and Hafnium Carbonitrides Synthesized by a Mechanically Induced Self‐Propagating Reaction

Cited by 71 publications

References 46 publications

Toughening of complete solid solution cermets by graphite addition

Toughening of complete solid solution cermets by graphite addition

Influence of the milling parameters on the mechanical work intensity in planetary mills

Inverse core–rim microstructure in (Ti,Ta)(C,N)-based cermets developed by a mechanically induced self-sustaining reaction

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