Carbon Ceramic
Mostrando 25-36 de 36 artigos, teses e dissertações.
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25. Poly(borosiloxanes) as precursors for carbon fiber ceramic matrix composites
Ceramic matrix composites (CMCs), constituted of a silicon boron oxycarbide (SiBCO) matrix and unidirectional carbon fiber rods as a reinforcement phase, were prepared by pyrolysis of carbon fiber rods wrapped in polysiloxane (PS) or poly(borosiloxane) (PBS) matrices. The preparation of the polymeric precursors involved hydrolysis/condensation reactions of a
Materials Research. Publicado em: 2007-06
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26. Mapeamento do processo mecanizado de soldagem unilateral FCAW com backing cerâmico aplicável no passe de raiz em aço carbono
This work aims to evaluate one-sided welding automatic using the flux cored arc welding process with ceramic backing in the root bead. The tests were performed using a KUKA KR-16, robot for welding in the flat position. The wire is the AWS A5.20-79 E 71T-1, with 1.2 mm diameter, V-groove butt joints were design to be used in steel plate ASTM A-36. The proces
Publicado em: 2007
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27. Obtenção e caracterização de filmes de TiO2 depositados sobre cerâmica de revestimento via magnetron sputtering DC
Titanium oxide (TiO2) under ultraviolet light becomes catalyst of chemical reactions. This phenomenon can be used to break down hydrocarbon and water molecules bound. Hydrocarbon was changing into water and carbon dioxide. Adsorbed water molecule is degraded by film and form a layer of adsorbed hydroxyl groups (OH), which are able to increase surface energy,
Publicado em: 2007
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28. Thin film of copper hexacyanoferrate dispersed on the surface of a conducting carbon ceramic material, SiO2/ZrO2/C-graphite: characteristics and electrochemical studies
O material SiO2/ZrO2/C-graphite (SZC) foi preparado pelo método sol-gel apresentando duas composições, designadas por: (a) SZC30 (SiO2= 50%, ZrO2= 20%, C= 30%) e (b) SZC20 (SiO2 =60%, ZrO2= 20%, C= 20%) em % m. A estrutura do material foi investigada por difração de raios X (XRD), microscopia eletrônica de transmissão de alta resolução (HR-TEM) e es
Journal of the Brazilian Chemical Society. Publicado em: 2006-12
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29. Surface characterization of alumina reinforced with niobium carbide obtained by polymer precursor
Active filler controlled pyrolysis of polymers (AFCOP) is a recent method for obtaining near-net shaped ceramic bodies. Alumina based composites have been developed for use as cutting tools, so knowledge of the surface composition is extremely important because it is directly related to the hardness and wear resistance Samples containing a fixed concentratio
Materials Research. Publicado em: 2006-09
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30. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Compósitos são materiais de engenharia heterogêneos, constituídos de um ou mais tipos de reforço, com orientação definida ou não dispersos em uma matriz que tanto pode ser cerâmica, metálica ou polimérica. A combinação adequada destes materiais permite que as propriedades intrínsecas de cada um dos componentes contribuam na formação de um nov
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/07/2000
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31. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Composites are heterogeneous materials made by one or more types of reinforcements, disposed or not in a definied direction, which is dispersed in a ceramic, metallic or polymeric matrix. The combination of these materials permits that the intrinsic properties from each one of the components contribute in the formation of a new material having characteristic
Publicado em: 2000
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32. Processamento de compósitos C-SiCxOy via pirólise polimérica para aplicações termo estruturais / Processing of SICxOy composites by polymeric pyrolysis to thermo-structural applications
Compósitos são materiais de engenharia heterogêneos, constituídos de um ou mais tipos de reforço, com orientação definida ou não dispersos em uma matriz que tanto pode ser cerâmica, metálica ou polimérica. A combinação adequada destes materiais permite que as propriedades intrínsecas de cada um dos componentes contribuam na formação de um nov
Publicado em: 2000
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33. Detecção por emissão atomica : comparação de celas de detecção utilizadas em analise cromatografica
A GC-MIP system consisting of a Gas Chromatograph coupled to a Microwave Induced Plasma detector was used to analyze hydrocarbons and organochlorinated compounds. The chromatographic data acquired at the emission lines of carbon, chlorine and hydrogen was used to evaluate the performance of the GC-MIP. Such studies were undertaken using the MIP with configur
Publicado em: 1996
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34. Caracteristicas da usinagem de um composito de resina fenolica reforçada com fibras de vidro e carbono
Some experiments were carried out to study the performance of many different tool materials, like pure ceramic (AI203+Zr02), mixed ceramic (A1203+TiC) , SIALON (A1203+SbN4) , whiskers reinforced ceramic (AI203+sic) , cemented carbide ISO K10, cubic boron nitride (CBN), o and diamond (PCD). They were tested in turning of carbon and glass fiber reinforced feno
Publicado em: 1992
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35. Continuous Production of Flor Sherry from New York State Wines1
Flor sherry-like wines were produced continuously from New York State wines from Delaware or cold-pressed Concord grapes whose pigment contents were reduced with activated carbon. The course of flor fermentation was followed by total aldehyde analysis. Optimal flor production was observed at 18 to 20 C. Two continuous methods of fermentation were used. A gla
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36. Microbial production of surfactants and their commercial potential.
Many microorganisms, especially bacteria, produce biosurfactants when grown on water-immiscible substrates. Biosurfactants are more effective, selective, environmentally friendly, and stable than many synthetic surfactants. Most common biosurfactants are glycolipids in which carbohydrates are attached to a long-chain aliphatic acid, while others, like lipope