Efeito da adição de alumina nas propriedades físicas e mecânicas do β-fosfato tricálcico

Abstract

Among calcium phosphate bioceramics, tricalcium phosphate (TCP), in its polymorphic form β, receives many research efforts due to its excellent bioactivity and high resorbability rate making it suitable for the development of temporary orthopedic implants. However, this bioceramic presents a limitation in its processing which is associated with the β-γ phase transition. Then, it is necessary to use sintering additives for obtaining samples with higher densifcation and, consequently, higher mechanical properties. The aim of this work was to evaluate the effect of alumina addition on the physical and mechanical properties of β-tricalcium phosphate. Samples were prepared by uniaxial pressing followed by isostatic pressing. Afterwards, samples were submitted to heat treatments during 2 h at different temperatures (1100, 1200 and 1300 °C/2 h). Even though alumina was not responsible for increasing β-TCP/Al2O3 biocomposite mechanical strength, it acted as a good β phase stabilizer.