티타늄 스크랩을 이용한 분말제조 및 소결 성형체의 특성평가 (Property Evaluation of Ti Powder and Its Sintered Compacts Prepared by Ti Scrap)

서지정보

· 발행기관 : 한국재료학회
· 수록지 정보 : 한국재료학회지 / 20권 / 3호 / 125 ~ 131페이지
· 저자명 : 이승민, 최정철, 박현국, 우기도, 오익현

초록

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.

영어초록

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.

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