Abstract
Calcium phosphate films were formed by electron beam evaporation of β-TCP with and without simultaneous Ar ion beam bombardments. The Ca/P ratio was 0.76 without bombardments, but it was increased to 1.80 by bombarding of Ar ion beam extracted from the ion gun set to 0.8 A. Hydroxyapatite peaks were developed and became stronger with increases in beam current. The variations in chemical composition had an effect on the dissolution behaviors in isotonic saline solution showing two distinct features, pinhole and flat region. The dissolved thickness measured in the flat region of all calcium phosphate coating layers after 10 h immersion was similar with the range of 5450 and 6100 Å. However, the size of pinhole was larger for the calcium phosphate coating layer with the lower Ca/P ratio indicating more active dissolution.
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