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Effects of coals microscale structural features on their mechanical properties,propensity to crushing and fine dust formation

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International Journal of Coal Science & Technology 2023年第2期10卷 146-158页

作者： Elena Kossovich Svetlana Epshtein vera krasilova Jie Hao Maxim Minin National University of Science and Technology"MISIS" 4build.1Leninsky prospectMoscow 119049Russian Federation

The work is dedicated to revealing the structural features of coals with different ranks,such as anthracites,metaanthracite and graphite,that determine their ability to crush and form fine *** this purpose,a combination of various nanoin-dentation techniques and Raman spectroscopy was *** mechanical behavior of the selected coals was investigated by cyclic nanoindentation with increasing peak load and quasi-static *** alteration of the mechanical properties was studied by analysis of elastic moduli and damage indices *** groups of coals were identified based on their propensity to crushing during cyclic *** assigned to the first and second groups are characterized by local destruction in the contact zone with the indenter and the formation of a core of crushed *** assigned to the third group are characterized by bulk destruction(outside the zone of contact with the indenter).In general,the ability of coals to fracture under mechanical loading decreases in the series of metamorphism due to microscale compaction of vitrinite *** the series of anthracite,metaanthracite and graphite,it is established that the coal matter compaction takes place for the anthracite and metaanthracite,whereas graphite reveals rather different behavior due to abrupt change of its *** ratios between the amorphous and crystalline phases of carbon(S)were determined by deconvolution of coals Raman *** propensity of coals to crushing(a damage index Rw)increases with growth of the proportion of amorphous carbon in the coal *** the considered coals and metaanthracite,it is established that the proneness to destruction outside the contact zone with the indenter is determined by the ratio of amorphous and crystalline carbon of 1 and *** S parameter is lower than 1,the coals are being crushed only in the zone of contact with the indenter.

关键词： Coal Crushing Cyclic nanoindentation Raman spectroscopy Amorphous carbon Crystalline carbon

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