Thermal Expansion Behavior of Biocompatible Hydroxyapatite-BaTiO₃ Composites for Bone Substitutes

Abstract

In the present study, the thermal expansion behavior of biocompatible pure Hydroxyapatite (HA) and HA-BaTiO₃ composites were studied in the temperature range of −150 to 300°C. The composites were optimally processed by conventional pressure-less sintering at 1250°C for 2 hrs. The measured coefficients of thermal expansion (CTE) values in the temperature range close to the human body temperature were ranging from 11 × 10⁻⁶/°C to 12 × 10⁻⁶/°C. It was observed that the CTE values are almost stable in the entire temperature range of measurement and closely resembled with the values for natural human bone.

Keywords:

• Hydroxyapatite
• BaTiO₃
• Thermal expansion

Acknowledgments

Authors AKD and BB would like to thank Indo-US Joint Center on Biomaterials for Health Care, Dept. of Science and Technology, India and AB is thankful to National Science Foundation (grant/0844081), USA for financial support.