초음파분무열분해법에 의한 나노 텅스텐 분말의 형성 및 특성에 관하여
The Characteristics and Formation of Tungsten Nano-Powder byUltrasonic Spray Pyrolysis Method
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
Nanosize tungsten powder was synthesized by ultrasonic spray pyrolysis method through a solution containing ammonium metatungstate hydrate [(NH4)6W12O39텵2O] 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℃.
Abstract
Nanosize tungsten powder was synthesized by ultrasonic spray pyrolysis method through a solution containing ammonium metatungstate hydrate [(NH4)6W12O39텵2O] 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℃.
참고문헌 (11)
- R. W. Siegel, , NanoStructured Materials, 6, pp.205~ (1995)
- K. Jia, , ibid, 10, pp.875~ (1998)
- R. L. Holtz, , ibid, 7, pp.259~ (1996)
- B. K. Kim, "PM. World Congress Proceeding", pp.1252~ (1993)
- M. Langlet, "The Pyrosol Process and Pyrosis of Ultrasonically Generated Aerosol, Chemistry of Advanced Materials", pp.55~ (1993), Blackwell Scientific Publication
- L. Gao, , Nanostructured Materials, 5, pp.555~ (1995)
- J. Lezansui, , Powder Met. Int, 19, pp.29~ (1987)
- R. J. Lang, , J. Acoust. Soc. Am, 34, pp.6~ (1962)
- J. W. S. Layleigh, "The Theory of Sound", pp.344~ (1945), Dover Publication
- S. C. Zhang, , J. Am. Cer. Soc, 73, pp.61~ (1990)
- P. Walkder, , Powder Metallurgy, 28, pp.36~ (1985)