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  • Title/Summary/Keyword: Ti-Zr-Ni

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Limitation of Nitrogen ion Implantation and Ionplating Techniques Applied for Improvement of Wear Resistance of Metallic Implant Materials (금속 임플란트 소재의 내마모성 향상을 위하여 적용되는 질소 이온주입 및 이온도금법의 한계)

  • 김철생
    • Journal of Biomedical Engineering Research
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    • v.25 no.2
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    • pp.157-163
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    • 2004
  • Nitrogen ion implantation and ion plating techniques were applied for improvement of the wear resistance of metallic implant materials. In this work, the wear dissolution behaviour of a nitrogen ion implanted super stainless steel (S.S.S, 22Cr-20Ni-6Mo-0.25N) was compared with those of S.S.S, 316L SS and TiN coated 316L SS. The amounts of Cr and Ni ions worn-out from the specimens were Investigated using an electrothermal atomic absorption spectrometry. Furthermore, the Ti(Grade 2) disks were coated with TiN, ZrN and TiCN by use of low temperature arc vapor deposition and the wear resistance of the coating layers was compared with that of titanium. The chemical compositions of the nitrogen ion implanted and nitride coated layers were examined with a scanting auger electron spectroscopy. It wat observed that the metal ions released from the nitrogen ion implanted S.S.S surface were significantly reduced. From the results obtained, it was shown that the nitrogen ion implanted zone obtained with 100 KeV ion energy was easily removed within 200,000 revolutions from a wear dissolution testing under a similar load condition when applied to artificial hip joint. The remarkable improvement in wear resistance weir confirmed by the nitrides coated Ti materials and the wear properties differ greatly according to the chemical composition of the coating layers. for specimens with the same coating thickness of about 3μm, TiCN coated Ti showed the highest wear resistance. However, after removing the coating layers, the wear rates of all nitrides coated Ti reverted to their normal rates of below 10,000 revolutions from Ti-disk-on-disk wear testing under the same load condition. From the results obtained, it is suggested that the insufficient depth of the 100 Kel N\^+/ ion implanted zone and of the nitrides coated layers of 3μm are subject to restriction when used as frictional parts of load bearing implants.

Piezoelectric and dielectric properties of PMN-PZT ceramics with PNN substitution (PNN 치환에 따른 PMN-PZT 세라믹스의 유전 및 압전 특성)

  • Hwang, S.M.;Lee, J.S.;Yoon, K.H.;Yoo, J.H.;Jong, H.S.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11b
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    • pp.434-437
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    • 2001
  • In this study piezoelectric and dielectric properties of Pb(Mn1/3Nb2/3)O3Pb(Zr,Ti)O3 ceramics were investigated with Pb(Ni1/3Nb2/3)O3 substitution. As the Pb(Ni1/3Nb2/3)O3 substitution was increased, dielectric constant and electromechanical coupling factor (kp) were increased while mechanical quality factor decreased.

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Piezoelectric and dielectric properties of PMN-PZI ceramics will PNN substitution (PNN 치환에 따른 PMN-PZT 세라믹스의 유전 및 압전 특성)

  • 황상모;이정선;윤광희;류주현;정회승
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2001.11a
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    • pp.434-437
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    • 2001
  • In this study piezoelectric and dielectric properties of Pb(Mn\sub1/3/Nb\sub2/3/)O3-Pb(Zr,Ti)O3 ceramics were investigated with Pb(Ni\sub1/3/Nb\sub2/3/)O3 substitution. As the Pb(Ni\sub1/3/Nb\sub2/3/)O3) substitution was increased, dielectric constant and electromechanical coupling factor (kp) were increased while mechanical quality factor decreased.

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A study on the Electrical Characteristics of piezoelectric Ceramics Used In Ultrasonic Trasmitting Sensor by Ba Substitution (Ba 치환에 의한 초음파 송신기용 압전 소자의 전기적 특성에 관한 연구)

  • 조봉희;최창규;박창규;박상만
    • Electrical & Electronic Materials
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    • v.3 no.1
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    • pp.20-28
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    • 1990
  • Pb(Zr, Ti)O3-Pb(Ni, Nb)O3계 세라믹스에 Ba를 치완시켜 Ba치환량의 증가에 따른 유전율, 전기기계결합계수 및 압전 d정수의 변화를 고찰하였다. 또한 Ba치환에 따른 세라믹스 소자의 송신감도 특성을 조사하고 큐리온도 이동에 따른 온도안정성을 고려하여 초음파 송신기용 압전소자에 응용가능함을 보였다.

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Colored Cubic Zirconia(CCZ) Single Crystal Growth by Skull Method (SKull법에 의한 Colored Cubic Zirconia(CCZ)단결정 성장)

  • 김석호;최종건;정대식;오근호
    • Journal of the Korean Ceramic Society
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    • v.25 no.5
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    • pp.443-448
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    • 1988
  • Colored Cubic Zircona(CCZ) single crystals were grown by the skull melting method. The grown crystals were doped with up to 0.1wt% transition (Cu, Ni, Co, Ti, Fe, Mo, Cr, V, Mn) metal ions on ZrO2-Y2O3(9.5~10mol%) and their Optical transmission spectra(λ=300~800nm)data were obtained. Various colors were pronounced due to dopant effects in the grown Crystals.

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Surface Modification of AB2 Type Hydrogen Storage Alloys by Ball Milling for Ni-MH Battery (Ni-MH 전극용 AB2계 수소저장합금의 볼밀링 처리에 의한 표면개질 연구)

  • Moon, Hong-Gi;Park, Choong-Nyeon;Yoo, Joung-Hyun;Park, Chan-Jin;Choi, Jeon
    • Journal of Hydrogen and New Energy
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    • v.17 no.4
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    • pp.418-424
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    • 2006
  • In order to improve the activation properties of the AB2 type hydrogen storage alloys for Ni-MH battery, the alloy surface was modified by employing high energy ball milling. The Zr0.54Ti0.45V0.54Ni0.87Cr0.15Co0.21Mn0.24 alloy powder was ball milled for various period by using the high energy ball mill. As the ball milling time increased, activation of the AB2 type composite powder electrodes were enhanced regardless of additives. When the ball milling time was small discharge capacities of the AB2 type composite powder electrodes increased with the milling time. On the other hand for large milling time it decreased with increasing milling time. The maximum discharge capacity was obtained by ball milling for 3-4 min.

Microstructures and Mechanical Properties of Beryllium(Be)-free Ni-Cr-Mo based Alloys for Metal-Ceramic Crown (베릴륨(Be)이 미 첨가된 치과도재소부용 Ni-Cr-Mo계 합금의 미세조직 및 기계적 성질 특성)

  • Song, Kyung-Woo;Go, Eun-Kyoung;Lee, Jung-Hwan;Jung, Jong-Hyun;Noh, Hak;Han, Jae-Ick
    • Journal of Technologic Dentistry
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    • v.28 no.2
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    • pp.321-329
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    • 2006
  • The popularity of Ni-Cr-Mo based metal alloys for metal-ceramic crown have increased recently because of low price, superior yield strength and rigidity. the use of these alloys give them the potential advantage of thinner copping with the required rigidity for long span bridges. The purpose of this study was to assess the microstructures and mechanical properties of Ni-Cr-Mo-(Si,Al,Nb,Zr,Ti.Cu,Mm) based Alloys not containing beryllium(Be) related toxic effects. The abtained results indicated that as-cast these specimen alloys showed compositional and microstructural differences, and mechanical properties values of Ni69Cr20Mo5Si2Al4 alloy among these specimen alloys was found to be superior to those of commercial Ni-Cr based alloy using in market place today.

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Dielectric and Electric Properties of Mutilayer Ceramic Capacitor with SL Temperature Characteristics (SL 온도특성을 가지는 적층 칩 세라믹 캐패시터용 유전체의 유전 및 전기적 특성)

  • Yoon, Jung-Rag;Lee, Sang-Won;Kim, Min-Ki;Lee, Kyoung-Min
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.7
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    • pp.645-651
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    • 2008
  • To reduce noise in high frequency and distortion of signal, the composition of (Ca0.7Sr0.3)(Zr0.97Ti0.03)O3 and (Ba0.2Ca0.4Sr0.4)TiO3 was developed. The composition was not solid solution, but mixtures of various phases composed of Ca, Sr, Zr, Ti and Ba oxides. The dielectric constant increased, the quality factor and the insulation resistance decreased with (Ba0.2Ca0.4Sr0.4)TiO3 content. The composition of 0.4(Ba0.2Ca0.4Sr0.4)TiO3 satisfied the electric characteristics and the temperature coefficient of dielectric constant (TCC). In addition, the glass frit and MnO2 also affected the electric characteristics. From the result of the best fit simulation, MnO2 0.3 mol%, the glass frit 0.6 wt% showed the insulation resistance 906ΩF, the quality factor 821, and the dielectric constant 92. With the selected composition, MLCC capacitors sized 4.5×3.2×2.5mm were manufactured with 105 layered of the dielectric thickness 16μm using Ni inner electrode, They represented the capacitance 98102 nF, the quality factor 1,200 and the insulation resistance 1,500ΩF. Also, they had high break-down voltage with 107115V/μm, and satisfied the SL TCC characteristics.