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Itens para a visualização no momento 91-100 of 196
Montagem de um dispositivo para espectroscopia de ressonância de ultrassom e aplicação na análise da relaxação estrutural da fase amorfa do tungstato de zircônio
(2014-06-24)
Zirconium tungstate (ZrW2O8) is a ceramic material, which exhibits cubic symmetry, first
prepared some 50 years ago by Graham et al. and presents a series of unusual properties, most
notably the isotropic contraction ...
Síntese e caracterização de revestimentos protetores de ZrN/TiN sobre o biomaterial Nitinol obtidos por tratamento duplex.
(2014-06-05)
The present work aims to study about duplex treatment on the biomaterial Nitinol (NiTi). This treatment consists in titanium nitride (TiN) formed by plasma nitration, followed by zirconium nitride (ZrN) thin film deposition ...
Influência da temperatura de sinterização nas propriedades mecânicas de molas de alumina injetadas em baixa pressão
(2014-06-05)
In this work, ceramic coil springs was prepared by low-pressure injection molding using alumina submicrometer-sized powder. The powder are mixed with organic binders in the Pelstman machine tank for several hours resulting ...
Química de superfície e atrito em nanoescala do aço-carbono AISI 1045 nitretado e pós-oxidado a plasma
(2014-06-23)
This work presents a quantitative chemical interpretation of friction for the
most external layers of AISI 1045 steel previously nitrided and post-oxidized during 0, 1,
5, 10, 20 and 30 min. The characterization of ...
Avaliação das técnicas de dispersão mecânica e ultrassônica de nanotubos de carbono de paredes múltiplas em resina epóxi
(2014-06-03)
In this study nanotubes/epoxy composites were produced in order to evaluate which of the two studied techniques would result in a better degree of dispersion and unentanglement of carbon nanotubes in epoxy resin. The ...
Fotossensibilizadores nanoestruturados por sistema camada por camada
(2014-06-05)
The search for materials that can be modified at molecular level has been the subject of several studies worldwide. Thus, the production techniques of thin films stand out due to the possibility of reducing costs and ...
Caracterização magnética de aço com a superfície endurecida
(2014-06-03)
This work investigates the magnetic properties (hysteresis loop and Barkhausen noise) in some steels (ABNT 1045, 1050 and 1548) whose surfaces had been hardened by induction. The goal was to develop a non-destructive test ...
Aplicação de areia de britagem de rochas basálticas na fabricação de concreto de cimento Portland
(2014-06-03)
Despite the technological advances on the structural concrete production, in natura materials are still used. This fact has been causing environmental and economic problems to the manufacturing chain. One of the problems ...
Tratamento termoquímico assistido a plasma para incremento da resistência à corrosão de aço-carbono
(2014-06-24)
This paper presents a study to facilitate the application of duplex treatment of
nitriding and post oxidation plasma as a way of enhancing the corrosion resistance of
carbon steel. The influence of microstructure, phase ...