2 research outputs found

    Effects of the speed ratio on the efficiency of planetary mills

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    The ignition time (tig) of the mechanically induced self-sustaining reaction (MSR) process involving the formation of TiB2 from Ti/2B elemental mixtures was used to study the influence of the ratio (k = -蠅v/蠅d) between the rotational speed of the supporting disc (蠅d) and vials (蠅v) on the milling efficiency of a Pulverisette 4 planetary mill. The variation of the inverse of the ignition time (1/tig), which is directly related to the milling power provided by the planetary mill, with the process conditions has shown that it is not possible to find a single k value as optimal independently of the experimental conditions used (蠅d and the ball-to-powder ratio, BPR). Moreover, it was observed that the lowest milling efficiency (longer tig values) was found for k = 1, which is the usual value employed in routine laboratory works. The best efficiencies were found for the larger k values (2.5 or 3). At lower 蠅d, the shortest tig was obtained for k = 2.5 and at higher 蠅d for k = 3, independently of BPR.Secretaria de Estado de Universidades, Investigacion, Desarrollo e Innovacion, Spain MAT2014-52407-REuropean Regional Development Fund, European Unio

    Effects of the speed ratio on the efficiency of planetary mills

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    The ignition time (tig) of the mechanically induced self-sustaining reaction (MSR) process involving the formation of TiB2 from Ti/2B elemental mixtures was used to study the influence of the ratio (k = -蠅v/蠅d) between the rotational speed of the supporting disc (蠅d) and vials (蠅v) on the milling efficiency of a Pulverisette 4 planetary mill. The variation of the inverse of the ignition time (1/tig), which is directly related to the milling power provided by the planetary mill, with the process conditions has shown that it is not possible to find a single k value as optimal independently of the experimental conditions used (蠅d and the ball-to-powder ratio, BPR). Moreover, it was observed that the lowest milling efficiency (longer tig values) was found for k = 1, which is the usual value employed in routine laboratory works. The best efficiencies were found for the larger k values (2.5 or 3). At lower 蠅d, the shortest tig was obtained for k = 2.5 and at higher 蠅d for k = 3, independently of BPR.Peer reviewe
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