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- W1489340108 abstract "The ‘boroncarbon system’ is a typical representative of hard refractory nonmetallic low Zceramic. Among various boron to carbon stoichiometry, the ratio higher than 2, are known as boron carbides. These offer many attractive advantage compared to any commercially available hard materials [1-2]. Beside the powder forms, the sintered shapes find wide spread application in ballistic, biomedical application and component engineering. In principle the binary B-C system exist with a number of stable and metastable configurations [3]. Many classical and non classical processes have been considered [4 -12] for producing boron carbides. Among them the researchers have reported on existence of rhombohedral boron carbide with stoichiometry ratio (B/C) near to 4:1.The widely adopted carbothermal process requires rapid heating of all particle separately and individually up to temperature range 2473K to 2773K to achieve significant conversion of input material in 5 hours to 24 hours. In almost all carbothermal processes it is reported to have agglomerated carbon rich boron carbide with boron value up to 78.8%. As per the literature surveys, hardly any systematic investigation has been reported for existence of multiple phases in a single step solid state processing path. It is possible that selection or tailoring of properties for particular use can be made on basis of different stoichiometric phases of boron carbide [13].The presence of boron rich boron carbide can compensate the boron loss during boron carbide based solid body formation processes and thus preserves or improves the functional requirement. ‘Vapor deposition’ and ‘boron doping’ processes are the well studied processing methods which have confirmed the ‘non stoichiometric existence of boron carbides’ [3, 14.15]. With reference to above facts the research article discusses the structure and analytical development of many phases of boron carbide formed in a ‘B2O3 Mg – C’ micropyretic process with bulk boron to carbon ratio as 5.042:1[16]." @default.
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- W1489340108 date "2011-08-01" @default.
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- W1489340108 title "Evolution of Crystallographic Structures and Phases in Micropyretically Formed Boron Rich Boron Carbide – a New Material System" @default.
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- W1489340108 doi "https://doi.org/10.5772/17981" @default.
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