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Itens para a visualização no momento 71-80 of 150
Identificação e caracterização dos sítios superficiais de partículas de alumina e interações de adsorção com o ácido esteárico
(2014-06-24)
Ceramic oxides, e.g. alumina, can be used in various applications due to their
reactive surface, hardness and thermomechanical resistance. One of the attributes that
determines its application is the ability of the surface ...
Caracterização de compósitos elastoméricos com resíduos industriais de copolímero de butadienoe estireno (SBR) desvulcanizado por micro-ondas
(2014-06-23)
The aim of this work was to evaluate the effects of two accelerated aging processes on
the chemical characteristics of styrene butadiene rubber (SBR) composites filled with
industrial scraps (SBR-r) devulcanized by ...
Estudo de plastificantes alternativos ao dioctilftalato (DOP) para um composto de poli (cloreto de vinila) (PVC)
(2014-06-23)
The physical characteristics of the PVC can be changed by adding different additives
during processing. A specific type of poly(vinyl chloride) (PVC), obtained by emulsion
method is widely used in the manufacture of shoes ...
Efeito da oxidação nas análises de dureza e atrito em filmes finos de Si3N4
(2014-06-23)
Hard coatings are widely used in surface engineering of mechanical components due to
their high wear resistance and reduced friction coefficients. Actually, the dry cutting techniques
are demanding new materials with ...
Estudo da influência do lubrificante sólido MoS2 nas propriedades de revestimentos protetores de TiN
(2014-06-03)
In this study we investigated the protective coating of titanium nitride using incorporation of molybdenum disulfide as a solid lubricant, seeking application in parts and cutting tools in the metal working industry. This ...
Avaliação de diferentes potenciais interatômicos no cálculo do tensor de elasticidade do tungstato de zircônio
(2014-05-28)
Zirconium tungstate (ZrW2O8) is a material that exhibits negative thermal expansion (NTE), over a wide temperature range (0.3 at 1050 K). Although thoroughly studied, controversies still remain concerning the microscopic ...
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 ...