Metallization
Mostrando 1-12 de 18 artigos, teses e dissertações.
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1. A New Miniaturized Low-Profile and Stable Dual-Band FSS with 2.5D Structure for ISM Bands
Abstract Based on 2.5-Dimensional (2.5D) frequency selective surface (FSS) structures, a new miniaturized frequency selective surface structure is proposed in this work to operate as a bandreject filter in the 2.4 GHz (2400 to 2483.5 MHz) and 5 GHz (5150 to 5350 MHz and 5470 to 5725 MHz) ISM (Industrial, Scientific, and Medical) bands. The FSS has the metall
Journal of Microwaves, Optoelectronics and Electromagnetic Applications. Publicado em: 2022
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2. Development and comparison of n+pn+ and n+pp+ solar cells in multicrystalline silicon
The goal of this paper is to present the development and comparison of p-type multicrystalline silicon solar cells with screen printed metallization. Industrial processes were developed to manufacture the n+pn+and n+pp+ solar cells. The n+pn+ structure was obtained with single phosphorus diffusion. The n+pp+ solar cell was developed and the p+ region was opt
Mat. Res.. Publicado em: 23/08/2013
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3. Desenvolvimento de células solares com metalização por serigrafia : influência do emissor N+
The main goal of the solar cell industry is to obtain high efficiency and low production cost. One line of action is to increase the efficiency of industrial solar cell . The goal of this dissertation is to develop n+pn+ solar cells in p-type Si-Cz wafer, solar grade, with metallization by screen printing and to evaluate the influence of the n+ emitter and P
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/12/2012
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4. Otimização e comparação de processos para formação do campo retrodifusor com boro em células solares
The aim of this thesis was to develop and compare methods for the formation of the back surface field and emitter with boron using n-type and p-type solar-grade Si-Cz wafers as well as analyze and optimize a manufacturing process of solar cells with structure n+pp+ and back surface field formed by boron. The highly doped p+ region was formed by spin-on depos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/03/2012
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5. Metalização mecânica de ZrO2 com Ti para brasagem ZrO2/Aço com ligas de adição sem metal ativo
As interfaces metal/cerâmicas utilizando zircônia têm dominado as aplicações industriais na última década, em virtude da alta resistência mecânica e tenacidade à fratura da zircônia, especialmente em temperaturas abaixo de 300 C. Destaca-se também a boa condutividade iônica em temperaturas elevadas deste componente. No presente trabalho, estudou
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/12/2011
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6. PELLETIZING AND REDUCING OF MAGNETITE CONCENTRATE / PELOTIZAÇÃO E REDUÇÃO DE CONCENTRADO MAGNETÍTICO
The global increasing trend of producing iron ore fines (sinter feed and pellet feed) has also increased the importance of the agglomeration processes, in particular the pelletizing, which has as main characteristic to produce high quality pellets with excellent mechanical resistance, besides being a less polluting process than the sintering. Currently, Braz
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/04/2011
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7. Preparo, caracterização e aplicação de fases estacionárias de poli(dimetilsiloxano-co-metilfenilsiloxano) sorvidas e imobilizadas sobre sílica e sílica zirconizada / Preparation, characterization and application of stationary phases based on poly(dimethylsiloxane-co-methylphenylsiloxane), sorbed and immobilized onto silica and zirconized silica
This work describes the development of new stationary phases (SP) based on poly(dimethylsiloxane-co-methylphenylsiloxane) sorbed and immobilized onto silica and zirconized silica for reversed phase high performance liquid chromatography. The polymer was immobilized by thermal treatment at 140 °C during 6 h, which were the conditions that produced SP with th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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8. Brazing of metals to zirconia mechanically metallized with titanium
The mechanical metallization is a successful technique at laboratory scale and specially applied to oxide ceramics. Indirect brazing process of zirconia to metals is achieved using active-metal-free filler alloys on previously metallized ceramic. Stabilized zirconia ceramics were mechanically metallized with Ti and wetting conditions evaluated using commerci
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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9. Preparation and antibacterial activity of silver nanoparticles impregnated in bacterial cellulose
A simple method was developed to load a large amount of silver nanoparticles into bacterial cellulose (BC) produced by Gluconacetobacter xylinus in a controlled manner. Due to the high electron-rich oxygen density in the BC macromolecules and the large surface area of the BC nanoporous structure as an effective nanoreactor, the in situ direct metallization t
Polímeros. Publicado em: 05/02/2010
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10. Sensor piezelétrico baseado na tecnologia dos eletretos termo-formados: aprimoramentos dos processos de produção / Piezoelectric sensor based on electrets thermoforming technology: improvements on the production processes
This work describes two improvements on the production of piezoelectric sensors, which are based on thermo-formed electrets technology. These sensors which were previously prepared by fusing and molding two Teflon FEP films into bubbles structures in a hot-press system, presented piezoelectric coefficients over 300 pC/N after properly electrical charging. Ho
Publicado em: 2010
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11. Deposition of thin film of titanium on ceramic substrate using the discharge for hollow cathode for Al2O3/Al2O3 indirect brazing
Thin films of titanium were deposited onto Al2O3 substrate by hollow cathode discharge method for the formation of a ceramic-ceramic joint using indirect brazing method. An advantage of using this technique is that a relatively small amount of titanium is required for the metallization of the ceramic surface when compared with other conventional methods. Rap
Materials Research. Publicado em: 2009
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12. Caracterização Microestrutural e Tribocorrosiva de Sistemas Metalocerâmicos Odontológicos do Tipo Ni-Cr/Porcelana E Ni-Cr/Ti/Porcelana
A prótese parcial fixa é empregada na reabilitação da forma e função de dentes parcial ou totalmente comprometidos, devendo permanecer unida permanentemente aos remanescentes dentários. O material mais utilizado na confecção de próteses odontológicas é a porcelana feldspática, disponibilizada sob a forma de pó de aluminossilicatos. As porcelana
Publicado em: 2006