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베어링강의 초음파나노표면개질에 의한 초음파 가속수명 피로특성 평가
전태진(T. J. Jeon),조인식(I. S. Cho),전진우(J. W. Jeon),김경재(K. J Kim),이창순(C. S Lee),박인규(I. G. Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A method of metal improvement, ultrasonic nanocrystalline surface modification (UNSM) treatment, has been applied to the SAE 52100 bearing steel which is made up of ferrite and spherodized cementite, in order to increase performances in terms of lifetime and safety. Although ultrasonic fatigue testing (UFT) is becoming more time consuming and costly with current design products, the long-time fatigue life test was performed on a piezoelectric system. It is the aim of our research to develop better understanding of fatigue properties of the untreated and UNSM-treated specimens in the gigacycle domain. The ultrasonic fatigue test results show that the gigacycle fatigue life of the UNSM-treated specimens was prolonged by spheroidal cementite particles, including increased surface microhardness in the range of 200 HV to 280 HV up to depth of 100 ㎛ from the surface. Moreover, surface structure was observed using transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) as well as fracture surface was analyzed using scanning electron microscopy (SEM).
해수 중에 존재하는 방사능 오염물질인 스트론튬 이온의 제거를 위한 새로운 흡착제의 개발
전진우(J. W. Jeon),박정민(J. M. Park),이민규(M. G. Lee) 한국해양환경·에너지학회 2014 한국해양환경·에너지학회 학술대회논문집 Vol.2014 No.5
Di-(2-ethylhexyl)-phosphoric acid(D2EHPA), tributyl phosphate(TBP)와 carbon nanotube(CNT)를 고정화한 polysulfone(PSf) 복합체를 제조하여 수중의 Sr(II)을 제거하는데 사용하였다. 주사전자현미경(SEM)과 적외선 분광기(FTIR)를 사용하여 제조한 PSf/D2EHPA/TBP/CNT 복합체의 특성분석을 하였다. 그리고 PSf/D2EHPA/TBP/CNT 복합체에 의한 Sr(II)을 제거하는 경우에 60 min에 평형에 도달하였다. Polysulfone (PSf) composite immobilized with di-(2-ethylhexyl)-phosphoric acid (D2EHPA), tributyl phosphate (TBP) and carbon nanotube (CNT) was prepared and used for the removal of Sr(II) from aqueous solution. The prepared PSf/D2EHPA/TBP/CNT composite was characterized by scanning electron microscopy (SEM) and fourier transform infrared spectrometer(FTIR). The equilibrium time of the Sr(II) by PSf/D2EHPA/TBP/CNT composite was 60 min.