Active thermography based on the heat transfer process in determining the influence of micro defects in bio-ceramic materials surface

This paper presents a non-destructive technique (NDT) using active infrared thermography and the thermal excitation consisting in an electric plane, applicable for bio-ceramic surface micro-defects detection. For this work we chose to study samples made of bio-ceramic (hydroxyl-apatite), having a cylindrical form with a diameter of φ = 15.20 mm and a thickness of 2.00 mm. The aim of this paper was to study the influence of surface defects in the heat transfer process for the bio-ceramic materials. The advantages of this method are the rapidity of determining and the safety of the material structure after the thermal excitation. For the concluding results there are necessary only a few seconds and a temperature difference of few Celsius degrees to discover the defect and the heat loss on the sample surface.