• 한국표면공학회:학술대회논문집
• /
• 한국표면공학회 2008년도 추계학술대회 초록집
• /
• pp.64-65
• /
• 2008

본 연구에서는 임상적으로 사용후 파절된 Ni-Ti파일의 표면 거동을 조사해보고 피로파괴수명 연장을 위하여 표면에 TiN/Ti 및 ZrN/Ti를 다층막으로 코팅한 후 표면의 특성을 조사하였다.

• 한국표면공학회:학술대회논문집
• /
• 한국표면공학회 2008년도 추계학술대회 초록집
• /
• pp.66-67
• /
• 2008

본 연구에서는 코팅된 Ni-Ti파일의 이온용출을 조사하기 위하여 표면에 형성된 TiN/Ti 및 ZrN/Ti다층막의 구강유사액에서 표면의 부식특성을 조사하였다.

• 한국원자력학회:학술대회논문집
• /
• 한국원자력학회 2001년도 추계학술발표회요약집
• /
• pp.214.1-214
• /
• 2001

• 한국세라믹학회지
• /
• 제30권11호
• /
• pp.949-954
• /
• 1993

Microstructural development at the ZrO2/NiTi bonding interface and reaction products were examined and identified with SEM and AEM. Ti-oxide, Ti2Ni and Ni2Ti layer were observed whose thickness depends on bonding temperature typically. The development of Ti-oxide layer is related with oxygen ion in ZrO2 and liquid phase Ti2Ni. It is considered that compositional deviation from homogeneity and residual stress caused by thermal expansion mismatch are closely related with the formation of the Ti2Ni phase.

• 대한의용생체공학회:의공학회지
• /
• 제14권3호
• /
• pp.283-290
• /
• 1993

In thls study, the effects of the composltional change of cast Ni-Ti alloys on its characteristics including mechanical properties, phase transformation temperature, and ion releasing rate were investigated. brittle:behavior was shown in the stress-strain curve of the alloy containing low Ti content (Ni-44.0%Ti). By increasing the Ti content, the trend in stress-strain curves changed from that of superelasticity to that of shape memory effect(Ni-44.4%Ti, Ni-45.1%Ti, Ni-45, 5%Ti). Phase transformation temperature ($A_f, {\;}M_5$ point) increased with increasing the Ti content. lon releasing rate of four types of Mi-Ti alloys was very low compared to that of the dental commerical Ni-Cr alloy.

• 한국전기화학회:학술대회논문집
• /
• 한국전기화학회 2005년도 수소연료전지공동심포지움 2005논문집
• /
• pp.335-340
• /
• 2005

Amorphous $MgNi_{1-x}Ti_x$ alloys with the composition of x=0.02, 0.03, 0.05 and 0.07 were synthesized by mechanical alloying. The synthesized alloys were investigated by electrochemical test, XRD and SEM. As increasing Ti concentration, the initial discharge capacity was raised more than that of nanocrystalline Mg-Ni 289 mAh/g, but the electrodes were degraded faster. Comparing to other synthesized alloys, $MgNi_{0.95}Ti_{0.05}$ alloy showed the highest initial discharged capacity 474 mAh/g and maintained $54\%$ of the initial capacity after 10 cycles.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2007년도 춘계학술대회 논문집
• /
• pp.1613-1618
• /
• 2007

Mechanical characteristics of composite materials containing NiTi shape memory alloy(SMA) have been analyzed in this study by conducting tensile, photo-elasticity and impact tests for the specimens. From the test results, the SMA composite materials can be considered as one of possible ways in detecting and controlling damages in the materials.

• 한국분말재료학회지
• /
• 제2권2호
• /
• pp.158-164
• /
• 1995

Synthesis of the NiTi shape memory alloy using the thermal explosion mode of the self-propagating high-temperature synthesis has been investigated. The significant fractions of intermetallics phases were found to form at the Ti/Ni powder interface during the heating to the ignition temperature and seemed to influence the relative fraction of phases in the final products. As the heating rate to the ignition temperature was increased, the combustion temperature and the fraction of NiTi in the final reaction products were increased. The synthesis reaction under 70 MPa compressive pressure yielded a reaction product with 98% theoretical density.

• 한국수소및신에너지학회논문집
• /
• 제10권2호
• /
• pp.141-149
• /
• 1999

현재 수소저장 합금을 이용하여 2차전지의 음극으로 개발되고 있는 $AB_5$ type의 $(LM)Ni_{4.49}Co_{0.1}Mn_{0.205}Al_{0.205}$ 조성의 수소저장합금과 $AB_2$ type의 $Ti_{0.6}Zr_{0.4}V_{0.6}Ni_{1.4}$ 조성의 수소저장합금에 Pd를 0, 0.5, 1, 2 wt% 첨가한 조성을 진공 중에서 arc 용해를 하였다. 용해된 합금의 조직과 결정구조를 SEM, XRD로 조사하였다. Pd 가 첨가되었음에도 조직이나 결정구조의 변화는 보이지 않았다. 미세한 구리분말을 합금분말 대비 3:1로 첨가하여 pellet형태의 전극을 제조하여 전극특성을 조사한 결과 Pd 첨가에 따른 초기 활성화와 급속 충방전 특성은 크게 변하지 않았다. 그러나 싸이클 수명에 있어서는 Pd를 첨가한 전극들이 Pd를 첨가하지 않는 전극에 비해 우수하였다. $AB_5$ type 조성의 합금에서는 Pd를 2wt% 첨가한 전극, 그리고 $AB_2$ type 조성의 합금에서는 Pd를 0.5wt% 첨가한 전극에서 싸이클 특성이 가장 우수하게 나타났다.

• 한국표면공학회지
• /
• 제49권6호
• /
• pp.560-566
• /
• 2016

In this study, porcelain bonding strength and mechanical properties of sintered Ni-Cr-Ti alloy for dental prosthodontics have been researched experimentally. Mechanical and morphological characteristics of the alloys were examined by Vickers hardness test, tensile and bonding strength test, surface roughness test, field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. In the sintered Ni-13Cr-xTi alloys, morphology of sintered alloy showed porous matrix diffused with alloying elements of Cr and Ti, and showed dendritic structure after melting process. From the XRD results, the second phases of NiCr, $Ni_3Cr$, and $Ni_3Ti$ were formed in the case of sintered and melted Ni-13Cr-xTi alloys. The tensile strength and hardness of Ni-13Cr-xTi alloys increased, as Ti content increased. Surface roughness increased, as Ti content increased. The bonding strength between metal and porcelain of Ni-13Cr-5Ti alloy was higher than those of Ni-13Cr and Ni-13Cr-10Ti alloys