Über den Mechanismus der mechanochemischen Synthese anorganischer Verbindungen

Tschakarov, Chr.G.; Gospodinov, G. G.; Bontschev, Zv.

doi:10.1016/0022-4596(82)90142-6

Cited by 69 publications

(42 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If it is supposed that all of these milling experiments were carried out under similar milling intensities, it can be deduced that approximately doubling the BPR value allows the reduction of the spinning rate of a planetary mill by 100 rpm. Comparing with the work of Tschakarov et al [15], a long ignition time of 300 min was observed in the present work when the milling regime in the planetary mill was dominated by friction.…”

Section: Comparison Of Efficiencies Of Milling Devicessupporting

confidence: 72%

“…To illustrate this, the present results were compared with three works found in the literature, where the formation of ZnSe by MSR can be inferred: the work of Tschakarov et al [15], in which a low energy vibratory mill was used, and ignition was observed after 312 min and two more recent works by Rafea [17] and Achimovicova et al [21], in which the formation of ZnSe in planetary mills took place after approximately 12-16 min and 15-18 min, respectively. Rafea [17] used a Retsch PM 100 planetary mill at 300 rpm, but unfortunately the BPR value was not provided.…”

Section: Comparison Of Efficiencies Of Milling Devicesmentioning

confidence: 87%

“…Tschaharov et al conducted the first systematic investigation on MSR studying the formation of metal chalcogenides (mainly sulphides) from their constituent elements [15].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

et al. 2013

View full text Add to dashboard Cite

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.

show abstract

Section: Comparison Of Efficiencies Of Milling Devicessupporting

confidence: 72%

Section: Comparison Of Efficiencies Of Milling Devicesmentioning

confidence: 87%

See 1 more Smart Citation

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

et al. 2013

View full text Add to dashboard Cite

show abstract

“…If these solid-state reactions are highly exothermic, View Article Online a self-sustaining reaction similar to thermally ignited selfpropagating high-temperature synthesis (SHS) can be initiated within the vial after a critical milling time called the ignition time (t ig ) and the majority of the reactants are consumed within seconds. This type of mechanochemical process is referred to as a mechanically induced self-sustaining reaction (MSR) 25 and has been reported in the synthesis of chalcogenides, 582 carbides, 377 nitrides, 406 borides, 391 silicides, 439 aluminides 583,584a and metals. 585 The self-heating capacity of mixtures submitted to milling determines the appearance of the MSR process.…”

Section: Self-sustaining Reactionsmentioning

confidence: 99%

Hallmarks of mechanochemistry: from nanoparticles to technology

et al. 2013

View full text Add to dashboard Cite

The aim of this review article on recent developments of mechanochemistry (nowadays established as a part of chemistry) is to provide a comprehensive overview of advances achieved in the field of atomistic processes, phase transformations, simple and multicomponent nanosystems and peculiarities of mechanochemical reactions. Industrial aspects with successful penetration into fields like materials engineering, heterogeneous catalysis and extractive metallurgy are also reviewed. The hallmarks of mechanochemistry include influencing reactivity of solids by the presence of solid-state defects, interphases and relaxation phenomena, enabling processes to take place under non-equilibrium conditions, creating a well-crystallized core of nanoparticles with disordered near-surface shell regions and performing simple dry time-convenient one-step syntheses. Underlying these hallmarks are technological consequences like preparing new nanomaterials with the desired properties or producing these materials in a reproducible way with high yield and under simple and easy operating conditions. The last but not least hallmark is enabling work under environmentally friendly and essentially waste-free conditions (822 references).

show abstract

“…Such may lead to the development of a propagating reaction mechanically induced self-propagating reactions (MSRs) front. Heat is also lost to the cold-milling bodies and the have been observed in metal-chalcogen systems, [9,10] in atmosphere. This heat loss tends to quench the reaction, metal-metalloid mixtures that form refractory comespecially in thin layers, where it is a large fraction of the pounds, [11,12] in displacement reactions between a metal reaction heat.…”

Section: Introductionmentioning

confidence: 96%

Self-propagating reaction induced by ball milling in a mixture of Cu2O and Al powders

Bakhshai

Pragani

Takács

2002

Metall Mater Trans A

View full text Add to dashboard Cite

The mechanochemical reduction of Cu 2 O with Al was induced via ball milling. A self-propagating reaction took place in two distinctly different ways. If the mass of the reactant powder mixture was large enough, ignition happened within a few seconds after starting the mill. Neither the activation of the reactants nor the formation of a powder layer covering the surfaces of the milling tools were necessary. If the mass of the charge is smaller than a critical value, the self-propagating reaction is ignited only after several minutes of mechanical activation. A slight excess of Al promoted an immediate reaction. The mechanism of the process is determined by the balance of the reaction heat, the heat transfer within the powder, and the heat loss to the environment. Local melting plays an important role, especially by promoting the formation of partially molten aggregates from free particles.

show abstract

Über den Mechanismus der mechanochemischen Synthese anorganischer Verbindungen

Cited by 69 publications

References 5 publications

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

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

Hallmarks of mechanochemistry: from nanoparticles to technology

Self-propagating reaction induced by ball milling in a mixture of Cu2O and Al powders

Contact Info

Product

Resources

About