Atomic Friction
Mostrando 1-12 de 20 artigos, teses e dissertações.
-
1. Experimental Thermal Analysis in Rotary Friction Welding of Dissimilar Materials
ABSTRACT: Rotary friction welding process (RFW) is one of the most used processes in the world for manufacturing bimetallic components that require high mechanical strength. All process occurs in solid state at temperatures below the melting point of the involved materials, having as the main bonding mechanisms the diffusion and mechanical mixture. The purpo
J. Aerosp. Technol. Manag.. Publicado em: 23/09/2019
-
2. Carbon Distribution in Ferritic-Martensitic Fe-Cr-C Alloys
Carbon distribution in Fe-Cr-C alloys with a variety of Cr concentrations is studied based on internal friction, optical and transmission-electron microscopy. It is found that the carbon distribution strongly depends on initial microstructure, being ferritic or ferritic/martensitic, which is determined by the thermal treatment, and Cr and carbon concentratio
Mat. Res.. Publicado em: 28/05/2018
-
3. Corrosion and Wear Resistance of Carbon Films Obtained by Electrodeposition on Ferritic Stainless Steel
In improving the corrosion and hardness proprieties of ferritic stainless steel, the use of protective coatings becomes an interesting alternative. In this study, a carbon layer was deposited on AISI 430 by electrodeposition using N,N-dimethylformamide with the addition of an organic dopant as the electrolyte. The AISI 430 stainless steel was pretreated by a
Mat. Res.. Publicado em: 2015-04
-
4. Bias voltage influence on the mechanical and tribological properties of titaniumaluminum nitride coatings produced by triode magnetron sputtering
TixAl1-xN coatings were grown using the triode magnetron sputtering technique with various bias voltages between -40 V and -150 V. As the bias voltage increased, an increase in the Al atomic percentage was observed, presenting a competition with Ti and producing structural changes. Moreover, the grain size and roughness were also strongly influenced by the b
Matéria (Rio J.). Publicado em: 2015-03
-
5. Investigation of the nugget zone corrosion behavior in friction stir welded lap joints of 6061-T6 aluminum alloy
The corrosion behavior at different positions (top and bottom) of the weld nugget zone along the thickness plates in AA6061-T6 aluminum alloys welded by friction stir lap welding, under the conditions of 1000 rpm-60 mm/min and 900 rpm-40 mm/min in a 3.5 wt% NaCl solution, was investigated by Tafel polarization at ambient temperature. The morphology of the nu
Mat. Res.. Publicado em: 2014-12
-
6. Micro and nanometric wear evaluation of metal discs used on determination of biodiesel fuel lubricity
The contact of diesel fuel with engine subsystems demands a good wear resistance. Lubricity is an important feature for integrity of injection system and the sulphur composites are primarily responsible for lubrication of the injector nozzle. Biodiesel is responsible for partially restoring the lubricity of diesel fuel that presents low levels of sulphur com
Mat. Res.. Publicado em: 04/07/2014
-
7. Preliminary viability studies of fibroblastic cells cultured on microcrystalline and nanocrystalline diamonds produced by chemical vapour deposition method
Implant materials used in orthopedics surgery have demonstrated some disadvantages, such as metallic corrosion processes, generation of wear particles, inflammation reactions and bone reabsorption in the implant region. The diamond produced through hot-filament chemical vapour deposition method is a new potential biomedical material due to its chemical inert
Mat. Res.. Publicado em: 13/11/2012
-
8. AÇO DUPLEX LDX 2101 SUBMETIDO À NITRETAÇÃO POR IMPLANTAÇÃO IÔNICA, IMPLANTAÇÃO IÔNICA POR IMERSÃO EM PLASMA E DESCARGA LUMINOSA: PROPRIEDADES MECÂNICAS E TRIBOLÓGICAS
In the present work showing the results on mechanical and tribological properties of duplex stainless steel LDX2101 nitriding by Ion Implantation (II), Plasma Immersion Ion Implantation (PI3) and Glow Discharge (GD). Nitrogen ion implantation was performed at room temperature and 350 C. The nitrogen fluencies were combined to obtain an atomic nitrogen concen
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/04/2011
-
9. DLC with silver nanoparticles study for space and biomedical applications / Estudo de crescimentos de filmes de DLC com nanopartículas de prata para aplicações espaciais e biomédicas
Diamond-like carbon (DLC) is a metastable form of amorphous carbon with high mechanical hardness, chemical inertness, optical transparency, low friction coefficient and its wear resistant. Since centuries, silver is known as bactericidal agent and, as a soft metal, its also used as a solid lubricant. This project develops a deposition process to insert silve
Publicado em: 2008
-
10. Entanglement and matrix product states in quantum phase transitions / Aceleração da nitretação ionica pela nanoestruturação de superficies metalicas induzidas por bombardeio com gases nobres
A presente tese trata o estudo as propriedades físicas resultantes em sistemas metálicos com superfícies nanoestrutura as pelo bombardeio com gás nobre e posteriormente nitretados com técnicas basea as em plasma. A busca e novas condições e tratamento que aumentem a velocidade a ifusão o nitrogênio é e grande interesse para a modificação e superf
Publicado em: 2007
-
11. Avaliação in vitro da força de atrito entre braquetes e fios ortodonticos na distalização do canino superior pela Tecnica de Força Direcional Seqüencial de Tweed-Merrifield / Evaluation of frictional forces in vitro between brackets and orthodontic wires in upper cusp distalization according to the Tweed-Merrifield Sequential Directional Force Technique
O objetivo desse estudo foi avaliar in vitro a força de atrito gerada na mecânica de distalização do canino superior pelo uso do gancho ?J? na Técnica da Força Direcional Seqüencial de Tweed-Merrifield, de acordo com as variáveis: tipo e marcas dos braquetes; espessura e marcas dos fios; técnica de amarração e análise das superfícies dos fios e
Publicado em: 2006
-
12. INFLUÊNCIA DA CONDENSAÇÃO CAPILAR NA FRICÇÃO EM NANO ESCALA / INFLUENCE OF CAPILLARY CONDENSATION IN NANOSCALE FRICTION
In this work, the procedures developed to the calibration of the AFM photodetector and cantilevers for lateral force measurements in our AFM is presented. A Matlab code that controls the microscope allows the study of the influence of the normal force on the lateral one. A second Matlab code was developed in order to study the adhesion forces in an automated
Publicado em: 2005