Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting

Diatomite has a wide variety of applications due to its physical and chemical properties and is widely used as a filter material because of its high porosity. It is a material that also has dielectric properties when in its natural state. In this work, a dielectric tape produced from the diatomite w...

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Autor principal: Macedo, Amanda Regina de Souza
Outros Autores: Gomes, Uilame Umbelino
Formato: Dissertação
Idioma:por
Publicado em: Brasil
Assuntos:
Diatomita
Tape casting
Microestrutura
Propriedades Dielétricas
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/24002
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id ri-123456789-24002
record_format dspace
institution Repositório Institucional
collection RI - UFRN
language por
topic Diatomita
Tape casting
Microestrutura
Propriedades Dielétricas
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
spellingShingle Diatomita
Tape casting
Microestrutura
Propriedades Dielétricas
CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA
Macedo, Amanda Regina de Souza
Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
description Diatomite has a wide variety of applications due to its physical and chemical properties and is widely used as a filter material because of its high porosity. It is a material that also has dielectric properties when in its natural state. In this work, a dielectric tape produced from the diatomite was studied through the tape casting process, to be applied in ceramic capacitors. The raw material (diatomite) was characterized by particulometry, X-ray diffraction (XRD), X-ray fluorescence (FRX), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) ). The ceramic tape was obtained by the preparation of a slip with diatomite powder, solvent, dispersant, binder, plasticizer and antifoam; The mixing of the materials was carried out in a ball mill. The rheology test was performed to evaluate the viscosity of the suspension. The slip was glued onto a film and, after 24 hours, the green ribbon was removed, which was characterized by differential thermal and thermogravimetric analysis (ATD \ ATG), DRX, FRX and MEV. A ceramic capacitor (prototype) was built with the green ribbon, in which the electrical capacitance and resistance measurements were performed, and the dielectric constant of the material (diatomite tape) was obtained as a function of the frequency used. The green ribbon underwent a heat treatment, for the removal of organics, at a temperature of 600 ° C and a heating rate of 0.5 ° C / min. The sintering was performed at three different temperatures (1000 ° C, 1150 ° C and 1250 ° C), with a heating rate of 5 ° C / min. And 60 min isotherm. The sintered tape was characterized by the XRD and SEM analyzes, and the results obtained for the measurements of density and porosity. It was observed that the sintered samples presented high porosity in their microstructure, however, for the higher sintering temperatures, there was a reduction of this porosity. The diatomite morphology was maintained for the green and sintered bands, showing its navicular and tubular shape. The presence of pores is due to a typical characteristic of the raw material (diatomite) used, as well as to the processing parameters, which significantly influenced the physical and dielectric properties of the material, particularly green tape. The crystalline structure, the microstructure, and the values of density and porosity obtained for the sintered tape varied according to the dilatometric behavior of the material due to alotropic transformations of the diatomite with temperature. The values of dielectric constants ranged from approximately 123.78 to 17.73 for low and high frequencies, respectively, of the green ribbon.
author2 Gomes, Uilame Umbelino
author_facet Gomes, Uilame Umbelino
Macedo, Amanda Regina de Souza
format masterThesis
author Macedo, Amanda Regina de Souza
author_sort Macedo, Amanda Regina de Souza
title Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
title_short Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
title_full Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
title_fullStr Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
title_full_unstemmed Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
title_sort obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting
publisher Brasil
publishDate 2017
url https://repositorio.ufrn.br/jspui/handle/123456789/24002
work_keys_str_mv AT macedoamandareginadesouza obtencaoecaracterizacaodeumafitadieletricaabasedediatomitaatravesdoprocessotapecasting
_version_ 1773967250598920192
spelling ri-123456789-240022022-04-01T18:43:12Z Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting Macedo, Amanda Regina de Souza Gomes, Uilame Umbelino http://lattes.cnpq.br/9858094266525225 http://lattes.cnpq.br/9858094266525225 Silva, Ariadne de Souza http://lattes.cnpq.br/5623381698478389 Souza, Carlson Pereira de http://lattes.cnpq.br/1030834608582624 Oliveira, Leiliane Alves de http://lattes.cnpq.br/7082478793734403 Diatomita Tape casting Microestrutura Propriedades Dielétricas CNPQ::ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA Diatomite has a wide variety of applications due to its physical and chemical properties and is widely used as a filter material because of its high porosity. It is a material that also has dielectric properties when in its natural state. In this work, a dielectric tape produced from the diatomite was studied through the tape casting process, to be applied in ceramic capacitors. The raw material (diatomite) was characterized by particulometry, X-ray diffraction (XRD), X-ray fluorescence (FRX), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) ). The ceramic tape was obtained by the preparation of a slip with diatomite powder, solvent, dispersant, binder, plasticizer and antifoam; The mixing of the materials was carried out in a ball mill. The rheology test was performed to evaluate the viscosity of the suspension. The slip was glued onto a film and, after 24 hours, the green ribbon was removed, which was characterized by differential thermal and thermogravimetric analysis (ATD \ ATG), DRX, FRX and MEV. A ceramic capacitor (prototype) was built with the green ribbon, in which the electrical capacitance and resistance measurements were performed, and the dielectric constant of the material (diatomite tape) was obtained as a function of the frequency used. The green ribbon underwent a heat treatment, for the removal of organics, at a temperature of 600 ° C and a heating rate of 0.5 ° C / min. The sintering was performed at three different temperatures (1000 ° C, 1150 ° C and 1250 ° C), with a heating rate of 5 ° C / min. And 60 min isotherm. The sintered tape was characterized by the XRD and SEM analyzes, and the results obtained for the measurements of density and porosity. It was observed that the sintered samples presented high porosity in their microstructure, however, for the higher sintering temperatures, there was a reduction of this porosity. The diatomite morphology was maintained for the green and sintered bands, showing its navicular and tubular shape. The presence of pores is due to a typical characteristic of the raw material (diatomite) used, as well as to the processing parameters, which significantly influenced the physical and dielectric properties of the material, particularly green tape. The crystalline structure, the microstructure, and the values of density and porosity obtained for the sintered tape varied according to the dilatometric behavior of the material due to alotropic transformations of the diatomite with temperature. The values of dielectric constants ranged from approximately 123.78 to 17.73 for low and high frequencies, respectively, of the green ribbon. Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) A diatomita possui uma grande variedade de aplicações devido as suas propriedades físicas e químicas, sendo utilizada amplamente como material filtrante por causa da sua elevada porosidade. É um material que, também, apresenta propriedades dielétricas quando no seu estado natural. Neste trabalho, estudou-se a obtenção de uma fita cerâmica produzida a partir da diatomita através do processo de tape casting, para ser aplicado como em capacitores dielétricos. A matéria-prima (diatomita) foi caracterizada através dos ensaios de particulometria, difração de raio x (DRX), fluorescência de raio x (FRX), microscopia eletrônica de varredura (MEV), e por espectroscopia de infravermelho com transformada de Fourier (FTIR). A fita cerâmica foi obtida através do preparo de uma barbotina com pó de diatomita, solvente, dispersante, ligante, plastificante e antiespumante; a mistura dos materiais foi realizada em um moinho de bolas. Foi realizado o ensaio de reologia para avaliar a viscosidade da suspensão. A barbotina foi colada sobre um filme e, após 24 horas, foi retirada a fita verde, que foi caracterizada através de análise térmica diferencial e termogravimétrica (ATD\ATG), DRX, FRX e MEV. Foi construído um capacitor cerâmico dielétrico (protótipo) com a fita verde, no qual foram realizadas as medidas elétricas de capacitância e resistência, e foi obtida a constante dielétrica do material (fita diatomita). A fita verde passou por um tratamento térmico para a eliminação dos orgânicos a uma temperatura de 600ºC e com uma taxa de aquecimento de 0,5 ºC\min. A sinterização foi realizada em três temperaturas diferentes (1000ºC, 1150ºC e 1250ºC), com uma taxa de aquecimento de 5ºC\min. e isoterma de 60 min. A mesma foi então caracterizada através das análises de DRX, MEV, e medidas de densidade e porosidade. Foi observado que as amostras sinterizadas apresentaram muita porosidade na sua microestrutura, entretanto, para as temperaturas de sinterizaçãomaiores, houve uma redução dessa porosidade. A morfologia da diatomita se manteve para as fitas a verde e sinterizadas, mostrando a sua forma navicular e tubular. A presença de poros deve-se a uma característica típica da matéria prima (diatomita) utilizada, como também aos parâmetros de processamento, que influenciaram significativamente nas propriedades dielétricas do material, particularmente da fita a verde. 2017-10-06T22:51:48Z 2017-10-06T22:51:48Z 2017-07-31 masterThesis MACEDO, Amanda Regina de Souza. Obtenção e caracterização de uma fita dielétrica a base de diatomita através do processo tape casting. 2017. 80f. Dissertação (Mestrado em Ciência e Engenharia de Materiais) - Centro de Ciências Exatas e da Terra, Universidade Federal do Rio Grande do Norte, Natal, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/24002 por Acesso Aberto application/pdf Brasil UFRN PROGRAMA DE PÓS-GRADUAÇÃO EM CIÊNCIA E ENGENHARIA DE MATERIAIS

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