Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética
Autor(a) principal: | |
---|---|
Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/11791 |
Resumo: | The radiation from lasers has been successfully applied to materials processing such as drilling, cutting and welding, sintering of ceramic oxides, surface heat treatment, directional solidification of single crystal fibers and texturing of crystalline compounds. The characteristics that make the laser radiation attractive to surface heat treatment processing are its coherence and collimation, which allowed the spatial control of the thermal energy. The modification of the material´s surface is dependent on the composition of the sample, the power of the laser and the radiation exposure time. Thus, the efficiency of crystallization, scalability and the possibility of local heating are some of the main attributes of laser crystallization. In addition, the laser can be used to induce crystallization on an amorphous substrate. Low cost of production is the main feature offered by laser crystallization to become an ideal solution for many industrial applications. A laser writing system can lead to the development of devices that can operate in aggressive environment like an acid or at high temperatures. Thus, the present work has the objective of developing versatile, low cost and programmable laser writing system, which allows the superficial heat treatment in glasses. In this work a CO2 laser source was used, which allowed the production of superficial crystallization. For the study of the developed system, it was chosen an eutectic composition glass (system LiO2.SiO2-CaO.SiO2), as the material model, in order to verify the control of the microstructure. After the crystallization the identified crystalline phases were calcium and lithium metassilicate, independent of the laser scanning speed. The microstructure formed and the depth of the heat affected zone shows a dependency with the laser scanning speed. Finally, it was found that the average interphase spacing obeys a similar relationship described by Jackson and Hunt for the solidification of eutectic systems, that is, by controlling the laser scanning speed it is possible to control the formed microstructure and thereby obtain the control of the final properties of the material. |
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Nunes, Ângela SantanaAndreeta, Marcello Rubens Barsihttp://lattes.cnpq.br/7904227795652627http://lattes.cnpq.br/253891717147950908765ce4-b0f7-4bca-91f3-34c6438ec3fe2019-09-06T18:47:43Z2019-09-06T18:47:43Z2019-03-01NUNES, Ângela Santana. Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11791.https://repositorio.ufscar.br/handle/ufscar/11791The radiation from lasers has been successfully applied to materials processing such as drilling, cutting and welding, sintering of ceramic oxides, surface heat treatment, directional solidification of single crystal fibers and texturing of crystalline compounds. The characteristics that make the laser radiation attractive to surface heat treatment processing are its coherence and collimation, which allowed the spatial control of the thermal energy. The modification of the material´s surface is dependent on the composition of the sample, the power of the laser and the radiation exposure time. Thus, the efficiency of crystallization, scalability and the possibility of local heating are some of the main attributes of laser crystallization. In addition, the laser can be used to induce crystallization on an amorphous substrate. Low cost of production is the main feature offered by laser crystallization to become an ideal solution for many industrial applications. A laser writing system can lead to the development of devices that can operate in aggressive environment like an acid or at high temperatures. Thus, the present work has the objective of developing versatile, low cost and programmable laser writing system, which allows the superficial heat treatment in glasses. In this work a CO2 laser source was used, which allowed the production of superficial crystallization. For the study of the developed system, it was chosen an eutectic composition glass (system LiO2.SiO2-CaO.SiO2), as the material model, in order to verify the control of the microstructure. After the crystallization the identified crystalline phases were calcium and lithium metassilicate, independent of the laser scanning speed. The microstructure formed and the depth of the heat affected zone shows a dependency with the laser scanning speed. Finally, it was found that the average interphase spacing obeys a similar relationship described by Jackson and Hunt for the solidification of eutectic systems, that is, by controlling the laser scanning speed it is possible to control the formed microstructure and thereby obtain the control of the final properties of the material.A radiação proveniente de lasers tem sido intensamente aplicada em processamento de materiais, tais como, processos de perfuração, corte e soldagem, tratamento térmico de superfície, texturização de compostos cristalinos, entre outros. As características que tornam a radiação laser atraente para esses propósitos são a coerência e a colimação, que permitem ajustar a distribuição de energia com elementos ópticos convencionais. Usando uma fonte de laser de CO2, foi demonstrado que a cristalização superficial em vidros poderia ser facilmente obtida. Assim, o baixo custo de equipamentos juntamente com a flexibilidade oferecida pela cristalização a laser, mostra-se uma solução ideal para muitas aplicações industriais. Ainda, a escrita a laser pode levar ao desenvolvimento de dispositivos que possivelmente possam trabalhar expostos a ambientes agressivos como ambientes ácidos ou de alta temperatura. Dessa maneira, o presente trabalho tem o objetivo de desenvolver um sistema versátil e programável, de baixo custo, que possibilite o tratamento superficial em vidros. Para o desenvolvimento do sistema programável escolheu-se trabalhar com um vidro modelo de composição eutética do sistema LiO2.SiO2-CaO.SiO2, cujos dados físico-químicos estão descritos na literatura, a fim de verificar o controle da microestrutura por meio do sistema desenvolvido. Após a cristalização superficial do vidro modelo, promovida pelo sistema desenvolvido, foram identificadas as fases cristalinas metassilicato de cálcio e metassilicato de lítio, independente da velocidade de varredura do laser. O estudo da microestrutura em função da velocidade de varredura do laser mostrou que quanto menor a velocidade de varredura, maior a quantidade de cristais formados. Também mostrou que tanto a microestrutura formada, quanto a profundidade da zona afetada pelo calor dependem da velocidade de varredura do laser. E por fim, que o espaçamento médio interfásico obedece a uma relação similar a descrita por Jackson e Hunt para a solidificação de sistemas eutéticos, ou seja, que através do controle da velocidade de varredura do laser é possível controlar a microestrutura formada e com isso obter o controle das propriedades finais do material.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)CAPES: Código de Financiamento 001porUniversidade Federal de São CarlosCâmpus São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarTécnica de cristalizaçãoSistema eutéticoCrystallization techniqueEutectic systemLasersENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAImplementação do sistema de cristalização superficial induzida por laser em vidro de composição eutéticaImplementation of a surface crystallization system induced by laser in eutectic composition glassinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisOnline921fb0d2-c74f-4d6a-984b-36d81af28359info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINALAngela Santana Nunes - Dissertação Definitiva.pdfAngela Santana Nunes - Dissertação Definitiva.pdfapplication/pdf2338094https://repositorio.ufscar.br/bitstream/ufscar/11791/1/Angela%20Santana%20Nunes%20-%20Disserta%c3%a7%c3%a3o%20Definitiva.pdfc6c6f5b78c08affa92721bcfe1fc43f8MD51LICENSElicense.txtlicense.txttext/plain; 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dc.title.por.fl_str_mv |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
dc.title.alternative.eng.fl_str_mv |
Implementation of a surface crystallization system induced by laser in eutectic composition glass |
title |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
spellingShingle |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética Nunes, Ângela Santana Técnica de cristalização Sistema eutético Crystallization technique Eutectic system Lasers ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
title_full |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
title_fullStr |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
title_full_unstemmed |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
title_sort |
Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética |
author |
Nunes, Ângela Santana |
author_facet |
Nunes, Ângela Santana |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/2538917171479509 |
dc.contributor.author.fl_str_mv |
Nunes, Ângela Santana |
dc.contributor.advisor1.fl_str_mv |
Andreeta, Marcello Rubens Barsi |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/7904227795652627 |
dc.contributor.authorID.fl_str_mv |
08765ce4-b0f7-4bca-91f3-34c6438ec3fe |
contributor_str_mv |
Andreeta, Marcello Rubens Barsi |
dc.subject.por.fl_str_mv |
Técnica de cristalização Sistema eutético |
topic |
Técnica de cristalização Sistema eutético Crystallization technique Eutectic system Lasers ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.eng.fl_str_mv |
Crystallization technique Eutectic system Lasers |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
The radiation from lasers has been successfully applied to materials processing such as drilling, cutting and welding, sintering of ceramic oxides, surface heat treatment, directional solidification of single crystal fibers and texturing of crystalline compounds. The characteristics that make the laser radiation attractive to surface heat treatment processing are its coherence and collimation, which allowed the spatial control of the thermal energy. The modification of the material´s surface is dependent on the composition of the sample, the power of the laser and the radiation exposure time. Thus, the efficiency of crystallization, scalability and the possibility of local heating are some of the main attributes of laser crystallization. In addition, the laser can be used to induce crystallization on an amorphous substrate. Low cost of production is the main feature offered by laser crystallization to become an ideal solution for many industrial applications. A laser writing system can lead to the development of devices that can operate in aggressive environment like an acid or at high temperatures. Thus, the present work has the objective of developing versatile, low cost and programmable laser writing system, which allows the superficial heat treatment in glasses. In this work a CO2 laser source was used, which allowed the production of superficial crystallization. For the study of the developed system, it was chosen an eutectic composition glass (system LiO2.SiO2-CaO.SiO2), as the material model, in order to verify the control of the microstructure. After the crystallization the identified crystalline phases were calcium and lithium metassilicate, independent of the laser scanning speed. The microstructure formed and the depth of the heat affected zone shows a dependency with the laser scanning speed. Finally, it was found that the average interphase spacing obeys a similar relationship described by Jackson and Hunt for the solidification of eutectic systems, that is, by controlling the laser scanning speed it is possible to control the formed microstructure and thereby obtain the control of the final properties of the material. |
publishDate |
2019 |
dc.date.accessioned.fl_str_mv |
2019-09-06T18:47:43Z |
dc.date.available.fl_str_mv |
2019-09-06T18:47:43Z |
dc.date.issued.fl_str_mv |
2019-03-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
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masterThesis |
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publishedVersion |
dc.identifier.citation.fl_str_mv |
NUNES, Ângela Santana. Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11791. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/11791 |
identifier_str_mv |
NUNES, Ângela Santana. Implementação do sistema de cristalização superficial induzida por laser em vidro de composição eutética. 2019. Dissertação (Mestrado em Ciência e Engenharia de Materiais) – Universidade Federal de São Carlos, São Carlos, 2019. Disponível em: https://repositorio.ufscar.br/handle/ufscar/11791. |
url |
https://repositorio.ufscar.br/handle/ufscar/11791 |
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openAccess |
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Universidade Federal de São Carlos Câmpus São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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Universidade Federal de São Carlos Câmpus São Carlos |
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