Abstract
Synthetic Hydroxyapatite (HAp) has been shown to be one of a select few materials which are both biocompatible and bioactive. HAp has an elastic moduli higher than that of cortical bone, however, due to unpredictable fatigue properties and design limitations, porous HAp cannot be used in a bulk form as a load bearing implant. These problems can be overcome by using HAp as a coating material on metallic and ceramic substrates. The use of a bioactive coating has been widely reported employing methods such as dip coating, immersion coating, electrophoretic deposition and thermal spraying which all involve heating the coating material up to temperatures where HAp will begin to decompose. Due to its small particle size, coatings produced via sol-gel methods offer lower sintering temperatures and increased stability. Substrates of single crystal magnesia, polycrystalline alumina and vycor glass have been successfully coated using sol-gel techniques based on calcium diethoxide solutions. Sintering temperatures as low as 900°C have been used to produce crystalline hydroxyapatite coatings. The production of sol-gel solutions and coatings, and the analysis of the coatings were carried out using XRD, SEM, RBS and AFM. Results so far indicate that high quality HAp coatings can be produced on ceramic substrates, which offer a number of benefits over other coating methods.
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Ben-Nissan, B., Chai, C. (1995). Sol-Gel Derived Bioactive Hydroxyapatite Coatings. In: Kossowsky, R., Kossovsky, N. (eds) Advances in Materials Science and Implant Orthopedic Surgery. NATO ASI Series, vol 294. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0157-8_18
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DOI: https://doi.org/10.1007/978-94-011-0157-8_18
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