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Microstructures and bond strengths of plasma-sprayed hydroxyapatite coatings on porous titanium substrates

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Abstract

Hydroxyapatite (HA) coating was carried out by plasma spraying on bulk Ti substrates and porous Ti substrates having a Young’s modulus similar to that of human bone. The microstructures and bond strengths of HA coatings were investigated in this study. The HA coatings with thickness of 200–250 μ m were free from cracks at interfaces between the coating and Ti substrates. XRD analysis revealed that the HA powder used for plasma spraying had a highly crystallized apatite structure, while the HA coating contained several phases other than HA. The bond strength between the HA coating and the Ti substrates evaluated by standard bonding test (ASTM C633-01) were strongly affected by the failure behavior of the HA coating. A mechanism to explain the failure is discussed in terms of surface roughness of the plasma-sprayed HA coatings on the bulk and porous Ti substrates.

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Authors and Affiliations

  1. Korea Institute of Industrial Technology (KITECH), P.O. Box #1, Wolgye-Dong, Gwangsan-gu, Gwangju, 506-824, South Korea

    Ik-Hyun Oh

  2. Department of Welfare Engineering, Iwate University, 4-3-5 Ueda, Morioka, 020-8551, Japan

    N. Nomura & A. Chiba

  3. Institute for Materials Research (IMR), Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai, 980-8577, Japan

    Y. Murayama, N. Masahashi & S. Hanada

  4. School of Advanced Materials Engineering, Kongju National University, 182, Sinkwan-Dong, Kongju City, Chungnam, 314-701, South Korea

    Byong-Taek Lee

Authors
  1. Ik-Hyun Oh
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  2. N. Nomura
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  3. A. Chiba
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  4. Y. Murayama
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  5. N. Masahashi
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  6. Byong-Taek Lee
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  7. S. Hanada
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Correspondence to Ik-Hyun Oh.

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Oh, IH., Nomura, N., Chiba, A. et al. Microstructures and bond strengths of plasma-sprayed hydroxyapatite coatings on porous titanium substrates. J Mater Sci: Mater Med 16, 635–640 (2005). https://doi.org/10.1007/s10856-005-2534-4

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  • DOI: https://doi.org/10.1007/s10856-005-2534-4

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