• 제목/요약/키워드: V-Ti-Ni

검색결과 255건 처리시간 0.024초

고내압용 Au/Ni/Ti/3C-SiC 쇼트키 다이오드의 제작과 그 특성 (Fabrication of a Au/Ni/Ti/3C-SiC Schottky Diode and its Characteristics for High-voltages)

  • 심재철;정귀상
    • 한국전기전자재료학회논문지
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    • 제24권4호
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    • pp.261-265
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    • 2011
  • This paper describes the fabrication and characteristics of a Au/Ni/Ti/3C-SiC Schottky diode with field plate (FP) edge termination. The Schottky contacts were annealed for 30 min at temperatures ranging from 0 to $800^{\circ}C$. At annealing temperature of $600^{\circ}C$, it showed an inhomogeneous Schottky barrier and had the best electrical characteristics. However, the annealing of $800^{\circ}C$ replaced it with ohmic behaviors because of the formation of many different types of nickel silicides. The fabricated Schottky diode had a breakdown voltage of 200 V, Schottky barrier height of 1.19 eV and worked normally even at $200^{\circ}C$.

기계적 합금화법과 열처리를 통한 Ni이 도핑 된 광촉매 $TiO_2$ 나노 복합상 제조 (Synthesis or photocatalytic Ni-doped nanocomposite $TiO_2$ by mechanical alloying and heat treatment)

  • 박하성;김동현;조재한;김선재;이경섭
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2005년도 제17회 워크샵 및 추계학술대회
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    • pp.667-672
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    • 2005
  • In order to effectively utilize visible light in the photocatalytic reaction, nanaocomposite of Ni doped $TiO_2$ and $NiTiO_3$ powders were synthesized by mechanical alloying and heat treatment. About 5.4 wt% of $NiTiO_3$ with particle size less than 15nm was uniformly formed in the Ni-doped rutile $TiO_2$ matrix. The UV/VIS-DRS and PL investigation showed that the nanocompasite $TiO_2$ powders had a longer absorpt ion wavelength (600$\sim$650nm, 2.0$\sim$1.9eV) than that of Ni-doped $TiO_2$ or rutile $TiO_2$ powder. The carbon decomposition of 4-CP by the nanocompasite $TiO_2$ powders were higher than other $TiO_2$ (P-25).

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수처리용 Ti/IrO2/SnO2-Sb-Ni 전극의 전기화학적 특성평가 (Electrochemical Properties of Ti/IrO2/SnO2-Sb-Ni Electrode for Water Treatment)

  • 양소영
    • 한국환경과학회지
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    • 제29권10호
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    • pp.943-949
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    • 2020
  • In this work, we prepared a heterojunction anode with a surface layer of SnO2-Sb-Ni (SSN) on a Ti/IrO2 electrode by thermal decomposition to improve the electrochemical activity of the Ti/IrO2 electrode. The Ti/IrO2-SSN electrode showed significantly improved electrochemical activity compared with Ti/IrO2. For the 0.1 M NaCl and 0.1 M Na2SO4 electrolytes, the onset potential of the Ti/IrO2-SSN electrode shifted in the positive direction by 0.1 VSCE and 0.4 VSCE, respectively. In 2.0-2.5 V voltages, the concentration in Ti/IrO2-SSN was 2.59-214.6 mg/L Cl2, and Ti/IrO2 was 0.55-49.21 mg/L Cl2. Moreover, the generation of the reactive chlorine species and degradation of Eosin-Y increased by 3.79-7.60 times and 1.06-2.15 times compared with that of Ti/IrO2. Among these voltages, the generation of the reactive chlorine species and degradation of Eosin-Y were the most improved at 2.25 V. Accordingly, in the Ti/IrO2-SSN electrode, it can be assumed that the competitive reaction between chlorine ion oxidation and water oxidation is minimized at an applied voltage of 2.25V.

Ti1-XZrxVNi 및 Ti1-XZrxV0.5Ni1.5계 수소저장합금의 전기화학적 성질 (Electrochemical Properties of Hydrogen Absorbing Ability Ti1-XZrxVNi Ti1-XZrxV0.5Ni1.5 Alloys)

  • 조태환;박찬교
    • 한국수소및신에너지학회논문집
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    • 제2권1호
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    • pp.15-21
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    • 1990
  • Nickel-hydrogen battery systems with metal hydride alloys are expected to have both higher energy density and lower pollution than nickel-cadmium cells. Nickel-hydrogen storage cells are expected to be well-suited for use in space crafts for a large capacity power storage system. Their major advantages are not only a capability of deep DOD(depth of discharge) using but also with excellent durability under excessive overcharging and overdischarging. In this study, the charge/discharge capacities, anodic polarization characteristics and durability for the continious charge/diacharge cycling of the $Ti_{1-X}Zr_XVNi$ and $Ti_{1-X}Zr_XV_{0.5}Ni_{1.5}$ alloys were measured by electrochemical method. The electrode properties of the copper or nickel plated $Ti_{1-X}Zr_XV_{0.5}Ni_{1.5}$ alloys were examined with a battery charge/discharge testing system in the temperature range of -5 to $25^{\circ}C$.

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TiN/NiTi 2층형 박막의 두께 변화에 따른 물리적 특성 기초연구

  • 변인섭;양지훈;김성환;정재인
    • 한국표면공학회:학술대회논문집
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    • 한국표면공학회 2018년도 춘계학술대회 논문집
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    • pp.132-132
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    • 2018
  • NiTi 형상 기억 합금은 형상기억 효과 (Shape memory effect) 또는 초탄성 효과 (superelasticity effect)를 나타낸다고 알려져 있다. 대표적으로 Ni:Ti 조성비가 1:1을 갖는 NiTi(니티놀) 합금은 형상기억 및 초탄성 효과가 우수하여 기계 가공 공정뿐만 아니라 우수한 내마모성을 요구하는 공구에 사용하기 적합하다. 하지만 NiTi 박막은 합금과 같은 Damping capacity를 가지고 있지만 비교적 낮은 물리적 특성을 가지고 있다. 본 연구에서는 NiTi 박막의 낮은 물리적 특성을 향상시키기 위하여 TiN과 NiTi의 2층형 박막을 제조하고 각 층의 두께 변화를 조절하여 특성 향상에 대한 기초연구를 진행했다. 타겟은 NiTi (Ni:Ti=48.2:51.8 at.%) 합금 타겟과 Ti 타겟을 사용하였고, 시편과 타겟 간의 거리는 약 10cm 이며, 시편은 기초분석을 위한 SUS304, 물리적 특성 평가를 위한 초경 을 사용하였다. 초경은 실제 공구에서 사용하고 있는 Co함량이 10% 함유된 시편은 선정했다. 시편 전처리는 알코올과 아세톤으로 세척을 실시한 후 진공챔버에 장착하고 ${\sim}10^{-5}Torr$ 까지 진공배기를 실시하였다. 기판 정청은 글로우 방전 방식으로 약 800 V 전압에서 30분간 실시했다. 공정 가스는 Ar와 $N_2$ 혼합가스를 사용하였으며, UBM(Un-Balanced Magnetron) 스퍼터링 소스를 이용하여 2층형 박막을 제조했다. TiN과 NiTi 층의 두께 비율을 0.5, 1 그리고 2 로 변화시켜 코팅했으며, 박막의 총 두께는 약 ${\sim}3{\mu}m$ 이다. 기초분석은 FE-SEM을 통해 두께와 박막 비율을 확인 및 XRD 분석을 통해 박막 정성분성을 실시했다. 2층형 박막의 물리적 특성은 Nanoindentation test, AFM 및 ball on disc를 이용하여 평가했으며, 그 결과 두께 비율 변화에 따라 물리적 특성 변화가 나타남을 확인했다.

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Intermetallic Compound Formation Behavior and Bump Shear strength at Sn-In Eutectic Solder/UBM Interface

  • 최재훈;전성우;정부양;오태성;김영호
    • 한국마이크로전자및패키징학회:학술대회논문집
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    • 한국마이크로전자및패키징학회 2003년도 기술심포지움 논문집
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    • pp.99-102
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    • 2003
  • Reactions between 48Sn-52In solder and under bump metallurgies(UBM) such as 100nm $Ti/8{\mu}m$ Cu and 300nm Al/400nm Ni(V)/400nm Cu have been investigated, and the shear strength of 48Sn-52In solder bumps on each UBM has been evaluated. While intermetallic compounds with two different morphologies were continuously thickened on Ti/Cu with repeating the reflow process, the intermetallics on Al/Ni(V)/Cu spalled into the solder with increasing the number of reflow times. The solder bumps on Ti/Cu exhibited higher shear strength than those on Al/Ni(V)/Cu.

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치아색으로 코팅된 NiTi 와이어의 전기화학적 특성 (Electrochemical Characteristics of Tooth Colored NiTi Wire)

  • 김원기;조주영;최한철;이호종
    • Corrosion Science and Technology
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    • 제9권5호
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    • pp.223-232
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    • 2010
  • NiTi alloy has been used for orthodontic wire due to good mechanical properties, such as elastic strength, friction resistance, and high corrosion resistance. Recently, these wire were coated by polymer and ceramic materials for aesthetics. The purpose of this study was to investigate electrochemical characteristics of tooth colored NiTi wire using various instruments. Wires (round type and rectangular type) were used, respectively, for experiment. Polymer coating was carried out for wire. Specimen was investigated with optical microscopy (OM), field emission scanning electron microscopy (FE-SEM) and energy dispersive x-ray spectroscopy (EDS). The corrosion properties of the specimens were examined using potentiodynamic tests (potential range of -1500 ~ 2000 mV) and electrochemical impedance spectroscopy (frequency range of 100 kHz ~ 10 mHz) in a 0.9 % NaCl solution by potentiostat. From the results of polarization behavior, the passive region of non-coated NiTi wire showed largely, whereas, the passive region of curved NiTi wire showed shortly in anodic polarization curve. In the case of coated NiTi wire, pitting and crevice corrosion occurred severely at interface between non-coated and coated region. From the results of EIS, polarization resistance(Rp) value of non-coated round and rectangular NiTi wire at curved part showed $5.10{\times}10^5{\Omega}cm^2$ and $4.43{\times}10^5{\Omega}cm^2$. lower than that of coated NiTi wire. $R_p$ of coated round and rectangular NiTi wire at curved part showed $1.31{\times}10^6{\Omega}cm^2$ and $1.19{\times}10^6{\Omega}cm^2$.

Soild-state reaction in Ti/Ni multilayers

  • 이주열;이영백;김태하;김기원
    • 한국진공학회:학술대회논문집
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    • 한국진공학회 1999년도 제17회 학술발표회 논문개요집
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    • pp.140-140
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    • 1999
  • Ti/Ni multilayered films (MLF) are ideal for neutron optics particularly in neutron guides and focusing devices. This system also possesses the tendency of amorphization through a solid-state reaction (SSR). This behaviors are closely related to the electronic structures and both magneto-optical (MO) and optical properties of metals depend strongly on their electron energy structures. Mutual inter-diffusion of the Tin and Ni atoms in the MLF caused by a low temperature annealing should decrease the thickness of pure Ni, as well as change the chemical and atomic order in the reactive zone. The application of the MO spectroscopy to the study of SSR in the MLF allows us to obtain an additional information on the changes in the atomic and chemical orders in the interface region. The optical one has no restriction on the magnetic state of the constituent sublayers. Therefore, the changes in magnetic, MO and optical properties of the Ti/Ni MLF due to SSR can be expected. To the best of our knowledge, the MO and optical spectroscopies were not used for this purpose. SSR has been studied in the series of the Ti/Ni MLFs with bilayer periods of 0.65-22.2nm and constant ratio of the Ti to Ni sublayers thickness by using MO and optical spectroscopies as well as an x-ray diffraction. The experimental MO and optical spectra are compared with the computer-simulated spectra, assuming various interface models. The relative changes in the x-ray diffraction spectra and MO properties of the Ti/Ni MLF caused by annealing are bigger for the multilayers with "thick" sublayers, or the SSR with the formation of amorphous alloy takes place mainly in the Ti/Ni multilayers with "thick" sublayers, while in the nominal threshold thickness of the Ni-sublayer for the observation of the equatorial Kerr effect in the as-deposited and annealed Ti/Ni MLFs of about 3.0 and 4.5nm thick is explained by the formation of amorphous alloy during the deposition or the formation of the nonmagnetic alloyed regions between pure components as a result of the SSR. For the case of Ti/Ni MLF the MO approach is more sensitive for the determination of the thickness of the reacted zone, while x-ray diffraction is more useful for structural analyses.structural analyses.

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Study of thermal stability of Ni Silicide using Ni-V Alloy

  • Zhong, Zhun;Oh, Soon-Young;Kim, Yong-Jin;Lee, Won-Jae;Zhang, Ying-Ying;Jung, Soon-Yen;Li, Shi-Guang;Kim, Yeong-Cheol;Wang, Jin-Suk;Lee, Hi-Deok
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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    • pp.16-17
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    • 2006
  • In this paper, Ni-V alloy was studied with different structures and thickness. In case of Ni-V and Ni-V/Co/TiN, low resistive Ni silicide was formed after one step RTP (Rapid Thermal Process) with temperature range from $400^{\circ}C$ to $600^{\circ}C$ for 30sec in vacuum. After furnace annealing with temperatures range from $550^{\circ}C$ to $650^{\circ}C$ for 30min in nitrogen ambient, Ni-V single structure shows the best thermal stability compare with the other ones. To enhance the thermal stability up to 650oC and find the optimal thickness of Ni silicide, different thickness of Ni-V was studied in this work. Stable sheet resistance was obtained through Ni-V single structure with optimal Ni-V thickness.

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LaNiO3의 (100)배향성이 Pb(Zr,Ti)O3 박막의 결정성장과 강유전성에 미치는 영향 (Effects of (100) Orientation of LaNiO3 on the Growth and Ferroelectric Properties of Pb(Zr,Ti)O3 Thin Films)

  • 박민석;서병준;유영배;문병기;손세모;정수태
    • 한국전기전자재료학회논문지
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    • 제18권4호
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    • pp.338-343
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    • 2005
  • Pb(Zr,Ti)O₃[PZT] thin films were prepared on a highly (100) oriented LaNiO₃[LNO] and a randomly oriented LNO by sol-gel process. The PZT thin films on a highly (100) oriented LNO show a high (100) crystal orientation (F=100 %), those on a randomly oriented LNO show a random crystal orientation (F=60 %). All the PZT layer have a flat and dense microstructure with large columnar grains and their grain size are 25 nm. In the ferroelectric curves at electric field of 40 kV/cm, a highly (100) oriented PZT/LNO samples show coercive field, E/sub c/=10 kV/cm and remanent polarization, P/sub r/=14.5 μC/㎠, while a randomly oriented PZT/LNO sample show E/sub c/=10 kV/cm and P/sub r/=5.4 μC/㎠.