VICKERS MICROHARDNESS MEASUREMENTS IN HYDROXIAPATITE SYNTHESIZED BY THE SOL-GEL METHOD USING EGG SHELL AS PRECURSOR

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Abstract
02-005 MARCELO MACHADO.V AGUILAR, M.S.(UNIVERSIDADE ESTÁCIO DE SÁ); DE CAMPOS, J.B.(UNIVERSIDADE ESTADUAL DO RIO DE JANEIRO); MACHADO.V, M.(UNIVERSIDADE ESTADUAL DO RIO DE JANEIRO); RAMOS, V.S.(Universidade Estadual do Rio de Janeiro); Hydroxyapatite (HAP) is a ceramic material with extraordinary biocompatibility. The mechanical properties of different hydroxyapatites have been determined to make a complete characterization of this biomaterial. Other mechanical properties such as modulus of elasticity (E), fracture toughness coefficient (KIC) and analysis of the plastic behavior of the material can be determined from experimental measurements of microhardness. The hydroxyapatite studied was synthesized by sol-gel, having as precursor chicken eggshell. From the synthesized powder, the specimens (pellets) were pressed. For the pressing process, the hydraulic press EVA type 40 of the company M. Moutinho - Máquinas Operatrizes, Máquinas em Geral e Abrasivos was used. Having obtained these green test specimens, it was necessary to sinter them, since after being sintered, the samples have acquire a greater degree of compactation. For the sintering process, it was used a continuous and asymptotic heating of the pellets up to 1000 oC. After obtaining the specimens by pressing and sintering, all were tested in the microdurometer (Pantec HDX - 1000TM), where partial results of Vickers microhardness were obtained. Experimentally determined Vickers microhardness values are statistically consistent with the mean value previously determined when using the same force parameter and time of force application by the Vickers indenter. The previous stage of Vickers microhardness tests was done precisely to define which force parameter would provide a better sharpness of the impression caused by the indenter.
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