1. Powder Technology Research GroupKorea Institute of Materials Science, Changwon 642-831, Korea
2. Titanium DepartmentKorea Institute of Materials Science, Changwon 642-831, Korea
3. Extractive Metallurgy DepartmentKorea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
4. Department of Metallurgical EngineeringPukyong National University, Busan 608-739, Korea