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

Abstract

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.

Toughening of complete solid solution cermets by graphite addition

“…First, the ceramic phase, i.e., the Ti-Ta carbonitride solid solution with nominal composition Ti 0.95 Ta 0.05 C 0.5 N 0.5 , was synthesised from the starting materials by the mechanochemical MSR process using a planetary mill (Pulverisette 4, Fritsch) that allowed for operation at a constant gas pressure and for the detection of self-propagating reactions during milling [39]. This composition was chosen according to a previous study that showed that the presence of Ta significantly improves the oxidation resistance of cermets [40], which is of crucial importance for high-temperature applications.…”

The role of boron oxide and carbon amounts in the mechanosynthesis of ZrB2–SiC–ZrC nanocomposite via a self-sustaining reaction in the zircon/magnesium/boron oxide/graphite system

“…The position of this peak shows the ignition time. The system used in this work has already been illustrated elsewhere [22]. Magnesium oxide by-product was removed by leaching the as-milled powder in a CHNS-932).…”

Mechanochemical synthesis of ZrB2–SiC–ZrC nanocomposite powder by metallothermic reduction of zircon

“…The position of this peak shows the ignition time. The system used in this work has already been illustrated elsewhere [22]. Magnesium oxide by-product was removed by leaching the as-milled powder in a 1M-HCl solution at 80 °C for 1 h.…”