Calcium Phosphate Glass‐Ceramics for Bioactive Coating on a β‐Titanium Alloy

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<jats:p>The formation of a porous coating is the decisive feature for the bio‐compatibility of silica‐free calcium phosphate glass ceramics on alloy surfaces like the β‐Ti structured Ti‐29Nb‐13Ta‐4.6Zr used in this work. The ceramic composition is highly important: 50 CaO‐40 P<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>‐7 Na<jats:sub>2</jats:sub>O‐3 TiO<jats:sub>2</jats:sub> glass powder produces a pore‐free coating unable to bind hydroxyapatite, whereas 60 CaO‐30 P<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>‐7 Na<jats:sub>2</jats:sub>O‐3 TiO<jats:sub>2</jats:sub> glass incorporates pores from which a crystalline hydroxyapatite phase can grow over the surface from simulated body fluid (see Figure).</jats:p>

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