• Title/Summary/Keyword: 합금층

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Infiltration of the Cu-Ti Alloys to Porous $Al_2O_3$ Ceramic Coating (Cu-Ti합금의 침투에 의한 $Al_2O_3$ 세라믹 용사층의 복합화)

  • 이형근;김대훈;황선효
    • Journal of Welding and Joining
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    • v.10 no.4
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    • pp.213-221
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    • 1992
  • Al$_{2}$O$_{3}$ ceramic coating layer by gas flame spraying was very porous, therefore it could not have wear and corrosion resistance at all. To get a dense and strong coating layer, a method to infiltrate an alloy into the pores of $Al_{2}$O$_{3}$ ceramic coating was investigated. Cu-Ti alloys, which had good wettability and reactivity with $Al_{2}$O$_{3}$ ceramic, were examined for infiltration. Infiltration of the alloys was performed in vacuum at 1100.deg.C. The melt of Cu-50 at % Ti alloy was well penetrated through the porous $Al_{2}$O$_{3}$ coating and tightly sealed the pores, unbounded area and microcracks in the coating. The alloy melt in the pores reacted with $Al_{2}$O$_{3}$ ceramic to produce a suboxide phase, Cu$_{2}$Ti$_{4}$O. This composite layer which was composed of $Al_{2}$O$_{3}$ and Cu$_{2}$Ti$_{4}$O phase had good microstructure and wear and corrosion resistance. Additionally, microstructures at interfaces between coating layers were greatly improved owing to the effect of vacuum heat treating.

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The Effects of Electroplating Parameters on the Mechanical Properties of Nickel-Iron Alloy Electrodeposits (Ni-Fe 합금 도금층의 기계적 물성에 영향을 미치는 도금인자)

  • Ko, Yeong-Kwon;Yim, Tai-Hong;Lee, Jae-Ho
    • Journal of the Microelectronics and Packaging Society
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    • v.15 no.4
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    • pp.71-76
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    • 2008
  • The mechanical properties of Ni-Fe alloy were varied with the current type, current density and bath conditions such as concentrations and temperature. The effect of electroplating parameters on the surface hardness, mechanical strength, residual stress and wear properties were investigated. The mechanical properties of electrodeposits with PC plating is superior to those with DC plating. Ni-Fe electrodeposits with PC has approximately 50% lower residual stress than that of DC plating. The tensile strength of PC electroplated specimen was 15% higher than that of DC electroplated specimen. The wear resistance of PC specimen was 30% improved relative to that of DC specimen.

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