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http://dx.doi.org/10.3740/MRSK.2002.12.5.391

Synthesis and Process Development of Ultrafine Ti Powder by Sodium Flame Encapsulation Method  

Maeng, Deok-Yeong (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute)
Lee, Chang-Gyu (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute)
Kim, Heung-Hui (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute)
Publication Information
Korean Journal of Materials Research / v.12, no.5, 2002 , pp. 391-397 More about this Journal
Abstract
Synthesis and process development of nano-size Ti powder by SFE(Sodium/halide Flame Encapsulation) method were investigated. Four concentric coflow burner was used and its flame configuration was $TiCl_4/Ar/Na/Ar$ in order from the center. Flame has been controlled by the various processing parameters such as temperature of burner and flow rates of both $TiCl_4$(g) precursor and Na(g). It was found that yellow-colored flame was shown in the flow rates of 70cc/min of $TiCl_4$(g) precursor and 2 $\ell$ /min of Na(g) which were regarded as optimum flame condition. The powders encapsuled by NaCl were produced having the average powder size of 250nm. The results of X-ray diffraction showed that powders from the optimized condition consisted of pure Ti and NaCl. TEM analysis confirmed that the several Ti powders of 20-100nm were encapsulated with NaCl. After removing sodium chloride by heat treatment, the spherical Ti powders with the size range of 80 to 150nm were obtained.
Keywords
nano; powder; SFE; coflow burner; encapsulation;
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