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It is commonly observed that WC–Co drill bit inserts wear more rapidly when drilling hematite ore than when drilling other ores of comparable hardness, e.g. ores that contain high percentages of SiO 2 . This investigation was carried out to assess if chemical wear is part of the wear process of these inserts, i.e. if chemical reactions occur between hematite (α-Fe 2 O 3 ) and...
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