Influence of milling parameters on the solid-gas synthesis of TiCxN1−x by mechanically induced self-sustaining reaction
The synthesis of a titanium carbonitride solid solution (TiCxN1−x) performed in a high-energy planetary mill by a solid-gas Mechanically induced Self-sustaining Reaction (MSR) was used to study the influence of a full set of experimental milling parameters on the ignition time (tig) as a measure of...
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Veröffentlicht in: | Powder technology 2017-09, Vol.319, p.12-18 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The synthesis of a titanium carbonitride solid solution (TiCxN1−x) performed in a high-energy planetary mill by a solid-gas Mechanically induced Self-sustaining Reaction (MSR) was used to study the influence of a full set of experimental milling parameters on the ignition time (tig) as a measure of the mechanical dose rate provided by the mill. The highly exothermic Ti-C-N mixture was selected to ensure no competitiveness between MSR and diffusion-controlled routes under the milling conditions employed. The results showed that the dependence of tig on the spinning rate followed a potential function, with a potential factor higher than the value of 3 that would be obtained if a perfect collision model is assumed. The scalability of milling processes performed using planetary mills was confirmed. The results suggested that to define a milling experiment, it is necessary to provide not only the Ball-to-Powder mass Ratio (BPR) and spinning rate values, as is usually performed, but also the full set of milling parameters including the nature of the milling media (vial and balls), the number and size of balls, the mass of the powder charge, the pressure of the reactive gas and even the volume of the vial.
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•The influence of the milling parameters on the TiCxN1−x synthesis was studied.•This TiCxN1−x synthesis was carried out by a solid-gas MSR process.•The variation of ignition time was used as a measure of the input mechanical dose.•A specific energy dose to ignite the mixture can be defined.•This can be employed to compare reactants and the efficiency of milling devices. |
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ISSN: | 0032-5910 1873-328X |
DOI: | 10.1016/j.powtec.2017.06.035 |