O ensaio mecanico de microdureza Vickers consiste em aplicar uma forca sobre a superficie de materiais e induzir uma deformacao plastica localizada. Por meio da anelise das dimensoes da impressao gerada em funcao da carga aplicada, determina-se um parametra denominado microdureza. Este ...
A forma do indentador de um testador de dureza Vickers deve ser capaz de produzir impressões geométricas semelhantes, independentemente do tamanho; a impressão deve ter pontos de medição bem definidos; e o indentador deve ter alta resistência à autodeformação. Um diamante na...
Para determinacao do perfil de dureza, foram realizados ensaios de dureza Vickers. Para obtencao e caracterizacao das microestruturas presentes no fundido Bi-1,5%Ag, fez-se o uso da microscopia otica e da fluorescencia de raios-x. Uma estrutura de dendritas facetadas de Bi circundadas ...
Before and after the heat treatments, microstructure analyzes of the implants were performed by optical and scanning electron microscopy, the phase transformation temperatures were quantified by differential scanning calorimetry, the phases were identified by X-ray diffraction and...
Samples were subjected to microhardness test and results shown in Vickers scale, at the top and the bottom of each sample. Statistical analysis showed that samples cured with fi rst generation LED presented the lowest values for Vickers hardness, either at the top or the bottom. In conclusion,...
In hardness measure system, Brinell e Vickers, the process to obtain the diameter and e diagonal of the identation, is liable to errors, since when made by experienced operators. This happens because the boundary lines are not sharp and by the fact that the human vision needs to training ...
The materials were evaluated for surface microhardness obtained by Vickers microhardness testing. Fifteen samples were prepared with 11 mm diameter and 2 mm thick, each restorative material. The samples were kept in storage conditions of the following substances: Gatorade 庐 (pH 2,9); Coca- Cola ...
Logo apos foram realizadas anAlises metalogrAficas corn auxilio de microscopio optico, ensaio de dureza superficial e perfil de dureza corn microdurometro em escala Vickers. Os resultados mostraram que para todos os tempos de tratamento houve endurecimento superficial em relaCAo ao material nAo ...
Methods: Ten test bodies were developed per sample (n= 10) and subjected to Vickers microhardness and porosity testing by computerized microtomography. Results: With respect to the presence of porosity, expressed in percentages, the Filtek group had the lowest mean values. When compared statistically...
The specimens were then submitted to Vickers microhardness test and flexural test. Data were analysed with ANOVA and Student-Newman-Keuls post-hoc test. The scheme of aging C and the Proclinic-PM composite recorded statistically lower microhardness values (p<0,05) than the other. Flexural ...