Some kinetic features of mechanical alloying transformation processes

Delogu, Francesco; Monagheddu, M.; Mulas, G.; Schiffini, L.; Cocco, G.

doi:10.1016/s0022-3093(98)00550-x

Cited by 51 publications

(77 citation statements)

References 8 publications

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“…A simplified semi-empirical model for the motion of milling bodies within the Spex mill has been developed by Davis et al [6]. A more detailed 3D model for the motion of the grinding media was proposed by Delogu et al [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of Grinding Media Size And Chamber Length on Grinding in a Spex Mixer Mill

Prasad

Theuerkauf

2009

Chem Eng & Technol

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The Spex mixer mills are widely used in the industry to synthesize a variety of materials. In the present study, the discrete element method (DEM) simulation technique is used to understand the motion of the grinding media and the effect of the size of the grinding media and the mill length on grinding. The simulations correspond to a grinding chamber with grinding media only. The total mass of grinding media in different numerical experiments with different grinding media sizes is kept constant. The average collision intensity per ball, which is defined as the product of the median of the contact force distribution and the number of collisions normalized to the number of grinding media, is used as the parameter to study the quantitative differences. The collision intensity distribution shows an optimum as a function of the grinding media diameter. Moreover, it was found that the collision intensity varies with the length of the grinding chamber.

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Section: Introductionmentioning

confidence: 99%

Effect of Grinding Media Size And Chamber Length on Grinding in a Spex Mixer Mill

Prasad

Theuerkauf

2009

Chem Eng & Technol

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show abstract

“…With prolonged milling, the crystal size of both reactants decreases in an exponential way, following a decreasing trend with the processing time t of the type: [8,9] …”

Section: The Mechanosynthesis Processmentioning

confidence: 99%

“…It has been generally recognized, by different authors, that the generic reaction path linking the time evolution of the reactants with time is sigmoidal. [8][9][10] We shall come back to this point dealing with the process kinetics. Here we could depict the second step of the reaction as:…”

Section: The Mechanosynthesis Processmentioning

confidence: 99%

“…The most important physical parameters involved are well described in a series of papers by Cocco and Delogu, [8,9,14] in an attempt to propose a quantitative understanding of the mechanical alloying processes. These authors have underlined the importance of relating basic and phenomenological aspects, suggesting that the framework of solid-state chemistry and chemical kinetics should be the most fruitful to interpret results and develop new trends.…”

Section: Kinematic and Mechanical Aspectsmentioning

confidence: 99%

“…1. Avvakumov [18] has proposed a kinetic equation for mechanochemical synthesis; Cocco et al [8,9,14] have validated it in some applications of mechanical alloying. One should consider the elements A and B that react to form the compound A n B at the initial ratio of A on B reactant in the reaction:…”

Section: Kineticsmentioning

confidence: 99%

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