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초음파분무열분해법에 의한 나노 텅스텐 분말의 형성 및 특성에 관하여
이호진(Ho Jin Lee),윤중현(Jung Hyun Yoon),최진일(Jean Il. Choe) 한국표면공학회 2008 한국표면공학회지 Vol.41 No.4
Nanosize tungsten powder was synthesized by ultrasonic spray pyrolysis method through a solution containing ammonium metatungstate hydrate [(NH₄)?W₁₂O₃?ㆍH₂O] and reduction treatment. It was expected the improvement of mechanical properties due to increasing surface free energy and surface activity. Starting solutions with each concentration, reaction temperature and reduction treatment were significantly influenced on the formation of tungsten size and phase. It was found that particle size was decreased with concentration of starting solution and surface tension were decreased. The particle size was increased at thermal decomposition temperature above 600℃ by neck growth of interparticles. Tungsten particles were formed by reduction reaction in atmosphere of hydrogen gas at the temperature above 700℃.