In this study, two typical ceramics were ground with a resin-bonded diamond wheel on a precision surface grinder under different conditions. According to the measured power consumed by the spindle, the normal and tangential force components operating on the grinding wheel, the force ratio, and the specific energy in grinding of ceramics were analyzed. The results show that the ceramic materials are mainly removed in the fracture mode, while most of the grinding energy is expended by ductile flow. The friction between the diamond wheel and ceramics should be taken into account in the investigation of the material removal mechanisms for ceramics grinding.
A green and efficient synthesis of benzo[d][1,3]thiazines through base-promoted cyclization reaction of o-isothiocyanato arylacetylenes with aroylacetonitriles has been developed. This protocol displays high step economy and efficiency, and tolerates various...
A highly efficient strategy to construct benzo [d][1,3]diazepines via selective CÀ H bond activation of N-aryl amidines and coupling with alkynyl cyclobutyl acetates was achieved successfully by Ru II -catalyzed [5 + 2] cyclization. This protocol features excellent regioselectivity, wide substrate tolerance, mild reaction conditions, which might be potentially applied in the discovery of lead compounds for the developing new drugs.
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