Caracterização mecânica e microestrutural em hidroxiapatita comercial e sintetizada pelo método sol-gel utilizando casca de ovo de galinha como precursor

Abstract

The proposal of this work is determine one of most important mechanical properties of brittle materials, the hardness. Our work brittle material are hydroxyapatite (HAP) synthesized using chicken eggs shells as precursors and commercial hydroxyapatite. We have been determined some preliminary Vickers microhardness measurements of this HAP sample, which were used to define an important experimental parameter, that is the indenter application force upon the sample surface. Another important experimental parameter, time of force application, have been determined by pertinent standards. Once assuming this experimental parameters, we have measured the Vickers microhardness to HAP synthesized from chiken eggs shell samples and have compared them with Vickers microhardness measures obtained to commercial HAP samples. These microhardness measures are part of mechanical caracterization proposal in this research to these two types of hydroxyapatites. Microstructural caracterization to these materials and to the samples produced from them, have been achieved using a field emission scanning electron microscope and have obtained the mean size of these HAP particles, using X-ray diffraction and themogravimetric analysis too. Comparing the Vickers microhardness results obtained and analyzing the statistical values calculed, could be noted that theses results have a reasonable similarity. The average to samples of hidroxiapatite using chicken eggs shells as precursor differing around 12,27% of the average to commercial hidroxiapatite samples.