Microhardness Knoop And Vickers
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Effect of indentation load and time on knoop and vickers microhardness tests for enamel and dentin
The aim of this study was to determine the effect of variations in indentation load and time on the Knoop and Vickers hardness numbers (KHN and VHN) for enamel and dentin. Twenty molar teeth were divided into twenty enamel and twenty dentin specimens. Each specimen was tested using a Knoop or Vickers microhardness tester at different loads and times. The dif
Materials Research. Publicado em: 2009
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2. Study of the parameters for microhardness test on dentin and enamel bovines, composite resin and amalgam / Estudo de parâmetros para ensaios de microdureza em amálgama de prata, resina composta, dentina e esmalte bovinos
The hardness is a mechanical property utilized to compare restorative materials such as biological tissue and can be defined as the resistance of material for a permanent impression and a number related to the applied force and the surface area. As each material has its own mechanical characteristic, for this study utilized two materials: amalgam and composi
Publicado em: 2008
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3. Evaluation of dental ceramics regarding tensile bond strength to dentin, Knoop and Vickers microhardness, surface roughness and atomic force microscopy / "Avaliação de cerâmicas odontológicas quanto à resistência de união com a dentina, por ensaio de tração, microdurezas Knoop e Vickers, rugosidade superficial e microscopia de força atômica"
Foram ensaiadas quatro cerâmicas VMK 95, Omega 900, IPS d. Sign e Cergogold. Os ensaios realizados foram: 1) resistência de união, por ensaio de tração, à dentina humana, de cones (6 x 3 x 5mm) de cerâmica, unidos por meio de cimentos fosfato de zinco, resinosos Rely X e Panávia F (n=10); 2) rugosidade pelos parâmetros Ra, Rt, Ry, Rz e Rp, de superf
Publicado em: 2006
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4. Combined Micro-Hardness and Eddy Currents Applied to the Study of Steel Decarburizing
Carbon is the most important element going in the steels composition since it largely contributes to their mechanical performance. During the heat treatment of steels, a part of atoms of carbon could be removed from the superficial zone of the steel, which is the result of the atmospheric oxygen attraction by forming gaseous carbon monoxide. This phenomenon,
Matéria (Rio J.). Publicado em: 2006
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5. Microstructural changes due to laser surface melting of an AISI 304 stainless steel
Several techniques can be used to improve surface properties. These can involve changes on the surface chemical composition (such as alloying and surface welding processes) or on the surface microstructure, such as hardening and melting. In the present work surface melting with a 3kW CO2 cw laser was done to alter surface features of an AISI 304 stainless st
Materials Research. Publicado em: 2001