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Journal of Thermal Spray Technology

, Volume 7, Issue 1, pp 50–57 | Cite as

Thermal Spraying of Functionally Graded Calcium Phosphate Coatings for Biomedical Implants

  • Y. Wang
  • K.A. Khor
  • P. Cheang
Article

Abstract

Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human body. Often, a combination of materials is needed. The preparation of a functionally graded bioceramic coating composed of essentially calcium phosphate compounds is explored. The coating is graded in accordance to adhesive strength, bioactivity, and bioresorbability. The bond coat on the Ti-6Al-4V stub is deposited with a particle range of the hydroxyapatite (HA) that will provide a high adhesive strength and bioactivity but have poor bioresorption properties. The top coat, however, is composed of predominantly a-tricalcium phosphate (a-TCP) that is highly bioresorbable. This arrangement has the propensity of allowing accelerated bio-integration of the coating by the body tissues as the top layer is rapidly resorbed, leaving the more bioactive intermediate layer to facilitate the much needed bioactive properties for proper osteoconduction. The processing steps and problems are highlighted, as well as the results of post-spray heat treatment.

Keywords

Thermal Spray Calcium Phosphate Bond Coat Functionally Grade Material Amorphous Calcium Phosphate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© ASM International 1998

Authors and Affiliations

  • Y. Wang
    • 1
  • K.A. Khor
    • 1
  • P. Cheang
    • 1
  1. 1.Nanyang Technological UniversitySingapore 63 9798Singapore

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