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Effect of Additives on the Characteristics of Amorphous Nano Boron Powder Fabricated by Self-Propagating High Temperature Synthesis

자전연소합성법을 이용한 비정질 나노 붕소 분말 특성에미치는 첨가제의 영향

Joo, Sin Hyong;Nersisyan, Hayk H.;Lee, Tae Hyuk;Cho, Young Hee;Kim, Hong Moule;Lee, Huk Hee;Lee, Jong Hyeon
주신형;;이태혁;조영희;김홍물;이혁희;이종현

  • Received : 2015.09.15
  • Accepted : 2015.10.19
  • Published : 2015.12.27

Abstract

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).

Keywords

amorphous boron;SHS;microstructure;nano powder

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Acknowledgement

Grant : development of nano-sized powder manufacturing technology for producing superconducting wire

Supported by : Ministry of Trade, Industry and Energy