Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis of Tungsten Boride using SHS(Self-propagating High-temperature Synthesis) and Effect of Its Parameters

자전연소 합성법을 이용한 W-B 화합물 합성 및 조건 변수의 영향

  • Choi, Sang-Hoon (Department of Nano Advanced Material Engineering, Chungnam National University) ;
  • Nersisyan, Hayk (Rapidly Solidified Materials Research Center(RASOM)) ;
  • Won, Changwhan (Department of Nano Advanced Material Engineering, Chungnam National University)
  • 최상훈 (충남대학교 나노신소재공학과) ;
  • ;
  • 원창환 (충남대학교 나노신소재공학과)
  • Received : 2014.04.11
  • Accepted : 2014.04.28
  • Published : 2014.05.27
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Abstract

Due to their unique properties, tungsten borides are good candidates for the industrial applications where certain features such as high hardness, chemical inertness, resistance to high temperatures, thermal shock and corrosion. In this study, conditions were investigated for producing tungsten boride powder from tungsten oxide($WO_3$) by self-propagating high-temperature synthesis (SHS) followed by HCl leaching techniques. In the first stage of the study, the exothermicity of the $WO_3$-Mg reaction was investigated by computer simulation. Based on the simulation experimental study was conducted and the SHS products consisting of borides and other compounds were obtained starting with different initial molar ratios of $WO_3$, Mg and $B_2O_3$. It was found that $WO_3$, Mg and $B_2O_3$ reaction system produced high combustion temperature and radical reaction so that diffusion between W and B was not properly occurred. Addition of NaCl and replacement of $B_2O_3$ with B successfully solved the diffusion problem. From the optimum condition tungsten boride($W_2B$ and WB) powders which has 0.1~0.9 um particle size were synthesized.

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References

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