Structure and properties of hydroxyapatite-bioactive glass composites plasma sprayed on Ti6Al4V

✍ Scribed by J. H. Chern Lin; M. L. Liu; C. P. Ju

• Publisher: Springer
• Year: 1994
• Tongue: English
• Weight: 896 KB
• Volume: 5
• Category: Article
• ISSN: 0957-4530
• DOI: 10.1007/bf00122397

✦ Synopsis

Hydroxyapatite (HA)-coated Ti6AI4V has recently been used as a bone substitute in orthopaedic and dental applications because of its favourable bioactivity and mechanical properties. Studies in the literature have shown that the bioactivity of calcium phosphate bioactive glass (BG) is higher than that of HA. In an attempt to increase the bioactivity of Ha-coated Ti6AI4V and enhance the bonding strength between coating and substrate, in the present study, HA/BG composites are applied onto Ti6AI4V using a plasma spraying technique. Microstructure and phase changes of the composite coatings after plasma spraying are studied. The coating-substrate bonding strength is evaluated using an Instron, following the ASTM C633 method. Results indicate that the average bonding strengths of BG, HA/BG and HA coatings are 33.0 _+ 4.3, 39.1 -t-5.0, and 52.0 4-11.7 MPa, respectively. Open pores with sizes up to 50 pm are found in both BG and HA/BG coatings, which are probably advantageous in including mechanical interlocking with the surrounding bone structure, once implanted. These HA/BG composites could provide a coating system with sufficient bonding strength, higher bioactivity, and a significant reduction in cost in raw materials. The future of this HA/BG composite coating system seems pretty bright.