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자전연소합성법을 이용한 비정질 나노 붕소 분말 특성에미치는 첨가제의 영향
주신형,이태혁,조영희,김홍물,이혁희,이종현,Joo, Sin Hyong,Nersisyan, Hayk H.,Lee, Tae Hyuk,Cho, Young Hee,Kim, Hong Moule,Lee, Huk Hee,Lee, Jong Hyeon 한국재료학회 2015 한국재료학회지 Vol.25 No.12
The self-propagating high temperature synthesis approach was applied to synthesize amorphous boron nano-powders in argon atmospheres. For this purpose, we investigated the characteristics of a thermally induced combustion wave in the $B_2O_3+{\alpha}Mg$ system(${\alpha}=1.0-8.0$) in an argon atmospheres. In this study, the exothermic nature of the $B_2O_3-Mg$ reaction was investigated using thermodynamic calculations. Experimental study was conducted based on the calculation data and the SHS products consisting of crystalline boron and other compounds were obtained starting with a different initial molar ratio of Mg. It was found that the $B_2O_3$ and Mg reaction system produced a high combustion temperature with a rapid combustion reaction. In order to regulate the combustion reaction, NaCl, $Na_2B_4O_7$ and $H_3BO_3$ additives were investigated as diluents. In an experimental study, it was found that all diluents effectively stabilized the reaction regime. The final product of the $B_2O_3+{\alpha}Mg$ system with 0.5 mole $Na_2B_4O_7$ was identified to be amorphous boron nano-powders(< 100 nm).