Nano-attached tungsten particle synthesis and sintering behaviors

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• 作者：Chulwoong Han (1)
  Hanshin Choi (1)
  Byoungmoon Kim (2)
  
• 关键词：powder processing ; sintering ; microstructure ; nanostructured materials ; scanning electron microscopy
• 刊名：Metals and Materials International
• 出版年：2013
• 出版时间：September 2013
• 年：2013
• 卷：19
• 期：5
• 页码：1035-1039
• 全文大小：902KB
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• 作者单位：Chulwoong Han (1)
  Hanshin Choi (1)
  Byoungmoon Kim (2)
  
  1. Korea Institute of Industrial Technology, Incheon, 406-840, South Korea
  2. Division of Energy and Environment System, Dongguk University, Gyeongju, 780-714, South Korea
  

文摘

The reduction of sintering temperatures in industrial processes is advantageous for both energy efficiency and material properties in powder metallurgy. Based on the well-known size effects of nano-particles on sintering processes, nano-particles were intentionally used as a homogeneous sintering activator for micro-particles in this study. Two kinds of tungsten bimodal feedstocks which consisted of nano-particles and microparticles were prepared and sintered by spark plasma sintering processed. Even at the low sintering temperature of 1,250 °C and the short sintering time of 300 sec, relatively high densities could be achieved. Depending on the content of the nano-particles in the charged feedstock, the sintered body exhibited different morphological features. Density, field emission scanning electron microscopy, transmission electron microscope was used for analysis.