티타늄 스크랩을 이용한 분말제조 및 소결 성형체의 특성평가

이승민; 최정철; 박현국; 우기도; 오익현; Seung-Min Lee; Jung-Chul Choi; Hyun-Kuk Park; Kee-Do Woo; Ik-Hyun Oh

Korean Journal of Materials Research, Vol.20, No.3, 125-131, March, 2010

DOI10.3740/MRSK.2010.20.3.125 Export Citation

티타늄 스크랩을 이용한 분말제조 및 소결 성형체의 특성평가

Property Evaluation of Ti Powder and Its Sintered Compacts Prepared by Ti Scrap

이승민, 최정철, 박현국, 우기도¹, 오익현^†

한국생산기술연구원
¹전북대학교 금속공학과

Seung-Min Lee, Jung-Chul Choi, Hyun-Kuk Park, Kee-Do Woo¹, and Ik-Hyun Oh^†

Korea Institute of Industrial Technology (KITECH), Gwangju 500-480, Korea
¹Division of Advanced Materials Engineering, Chon-Buk University, 561-761, Korea

E-mail:

In this study, Ti powders were fabricated from Ti scrap by the Hydrogenation-Dehydrogenation (HDH) method. The Ti powders were prepared from the spark plasma sintering (SPS) and their microstructure was investigated. Hydrogenation reactions of Ti scrap occurred at near 450oC with a sudden increase in the reaction temperature and the decreasing pressure of hydrogen gas during the hydrogenation process in the furnace. The dehydrogenation process was also carried out at 750oC for 2 hrs in a vacuum of 10-4 torr. After the HDH process, deoxidation treatment was carried out with the Ca (purity: 99.5%) at 700oC for 2 hrs in the vacuum system. It was found that the oxidation content of Ti powder that was deoxidized with Ca showed noticeably lower values, compared to the content obtained by the HDH process. In order to fabricate the Ti compacts, Ti powder was sintered under an applied uniaxial punch pressure of 40 MPa in the range of 900-1200oC for 5 min under a vacuum of 10-4 torr. The relative density of the compact was 99.5% at 1100oC and the tensile strength decreased with increasing sintering temperature. After sintering, all of the Ti compacts showed brittle fracture behavior, which occurred in an elastic range with short plastic yielding up to a peak stress. Ti improved the corrosion resistance of the Ti compacts, and the Pd powders were mixed with the HDH Ti powders.

Keywords:Ti;Ti alloys;HDH process;spark plasma sintering;potentiodynamic polarization

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