In the present work, spheroidization of angular vanadium powders using a radio frequency (RF) thermal plasma process is investigated. Initially, angular vanadium powders are spheroidized successfully at an average particle size of 100 μm using the RF-plasma process. It is difficult to avoid oxide layer formation on the surface of vanadium powder during the RF-plasma process. Titanium/vanadium/stainless steel functionally graded materials are manufactured with vanadium as the interlayer. Vanadium intermediate layers are deposited using both angular and spheroidized vanadium powders. Then, 17-4PH stainless steel is successfully deposited on the vanadium interlayer made from the angular powder. However, on the surface of the vanadium interlayer made from the spheroidized powder, delamination of 17-4PH occurs during deposition. The main cause of this phenomenon is presumed to be the high thickness of the vanadium interlayer and the relatively high level of surface oxidation of the interlayer.

Abstract
1. 서 론
2. 실험방법
3. 결과 및 고찰
    3.1 바나늄 분말의 RF-플라즈마 구상화 처리
    3.2 바나늄 분말을 이용한 타이타늄/바나듐/스텐인리스강 경사기능소재 제조
4. 결 론
References

• Nana Kwabena Adomako(한밭대학교 신소재공학)
• 양승민(한국생산기술연구원 강원지역본부 적층성형가공그룹) | Seungmin Yang (Additive Manufacturing R&D group, Korea Institute of Industrial Technology Gangwon Regional Division)
• 이민규(한국생산기술연구원 대경지역본부 극한가공기술그룹) | Min Gyu Lee (Ulitmate Fabrication Technology group, Korea Institute of Industrial Technology Daegyeong Regional Division)
• N. S. Reddyd(경상대학교 나노·신소재공학부)
• 김정한(한밭대학교 신소재공학) | Jeoung-Han Kim (Department of Materials Science & Engineering, Hanbat National University) Corresponding Author