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 <TEX>$TiCl_4/Ar/Na/Ar$</TEX> in order from the center. Flame has been controlled by the various processing parameters such as temperature of burner and flow rates of both <TEX>$TiCl_4$</TEX>(g) precursor and Na(g). It was found that yellow-colored flame was shown in the flow rates of 70cc/min of <TEX>$TiCl_4$</TEX>(g) precursor and 2 <TEX>$\ell$</TEX> /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.
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