Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation

Detalhes bibliográficos
Autor(a) principal: Gomes, Diego Ribas
Data de Publicação: 2014
Tipo de documento: Dissertação
Idioma: eng
Título da fonte: Repositório Institucional da UFSC
Texto Completo: https://repositorio.ufsc.br/xmlui/handle/123456789/123313
Resumo: Dissertação (mestrado) - Universidade Federal de Santa Catarina, Programa de Pós-Graduação em Ciência e Engenharia de Materiais, Florianópolis, 2014.
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spelling Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluationCiencia dos materiaisEngenharia de materiaisLasersAblação (Aerotermodinamica)Óxido de alumínioResistencia de materiaisDissertação (mestrado) - Universidade Federal de Santa Catarina, Programa de Pós-Graduação em Ciência e Engenharia de Materiais, Florianópolis, 2014.Abstract : The use of advanced ceramics has been limited by the high machining costs, with grinding and polishing accounting for 50-80% of the final product's total cost; and the inability of achieving satisfactory dimensional control and surface quality. Laser ablative processes are an alternative, considering the absence of wear-subjected tools and the possibility of very fine material removal. Although the research on laser ablation is a current topic of interest, with growing number of publications year after year, it's been focusing mainly on ultra-short pulses (in the order of pico- and femtoseconds), while the research on the low-cost and low-energy-consuming nanosecond regime (> 100 ns) is relatively scarce, specially for ceramics. This process outcomes are still difficult to predict, due to the many simultaneous and self-interacting physical processes that take place in a relatively short time. In this study, an experimental analysis has been carried out for a three-dimensional machining process with a 120 ns pulsed ytterbium fibre-laser on dense Al2O3 samples, initially through design of experiments, and later trough a step-by-step optimization procedure, evaluating ablation rate and resulting roughness. Then, surface morphology and fracture strength were evaluated for two of the "optimized" parameters sets. A very well-defined difference in removal rate and resulting surface topographies was observed, suggesting a threshold point between distinct ablation mechanisms. One of the combinations gave rise to interesting features of straight, angled shock-waves around melt pits. The fracture strength for both regimes also differed significantly, with a clear increase (121,6% e 163,5%) of the Weibull modulus combined with a decrease of the characteristic stress, compared to the non-ablated samples.Fredel, Márcio CelsoJanssen, RolfUniversidade Federal de Santa CatarinaGomes, Diego Ribas2014-08-06T18:04:10Z2014-08-06T18:04:10Z2014info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis75 p.| il., grafs., tabs.application/pdf327139https://repositorio.ufsc.br/xmlui/handle/123456789/123313engreponame:Repositório Institucional da UFSCinstname:Universidade Federal de Santa Catarina (UFSC)instacron:UFSCinfo:eu-repo/semantics/openAccess2016-03-07T18:55:21Zoai:repositorio.ufsc.br:123456789/123313Repositório InstitucionalPUBhttp://150.162.242.35/oai/requestopendoar:23732016-03-07T18:55:21Repositório Institucional da UFSC - Universidade Federal de Santa Catarina (UFSC)false
dc.title.none.fl_str_mv Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
title Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
spellingShingle Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
Gomes, Diego Ribas
Ciencia dos materiais
Engenharia de materiais
Lasers
Ablação (Aerotermodinamica)
Óxido de alumínio
Resistencia de materiais
title_short Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
title_full Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
title_fullStr Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
title_full_unstemmed Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
title_sort Nanosecond ablation of alumina with an ytterbium fibre-laser: experimental study, topography and damage evaluation
author Gomes, Diego Ribas
author_facet Gomes, Diego Ribas
author_role author
dc.contributor.none.fl_str_mv Fredel, Márcio Celso
Janssen, Rolf
Universidade Federal de Santa Catarina
dc.contributor.author.fl_str_mv Gomes, Diego Ribas
dc.subject.por.fl_str_mv Ciencia dos materiais
Engenharia de materiais
Lasers
Ablação (Aerotermodinamica)
Óxido de alumínio
Resistencia de materiais
topic Ciencia dos materiais
Engenharia de materiais
Lasers
Ablação (Aerotermodinamica)
Óxido de alumínio
Resistencia de materiais
description Dissertação (mestrado) - Universidade Federal de Santa Catarina, Programa de Pós-Graduação em Ciência e Engenharia de Materiais, Florianópolis, 2014.
publishDate 2014
dc.date.none.fl_str_mv 2014-08-06T18:04:10Z
2014-08-06T18:04:10Z
2014
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv 327139
https://repositorio.ufsc.br/xmlui/handle/123456789/123313
identifier_str_mv 327139
url https://repositorio.ufsc.br/xmlui/handle/123456789/123313
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 75 p.| il., grafs., tabs.
application/pdf
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFSC
instname:Universidade Federal de Santa Catarina (UFSC)
instacron:UFSC
instname_str Universidade Federal de Santa Catarina (UFSC)
instacron_str UFSC
institution UFSC
reponame_str Repositório Institucional da UFSC
collection Repositório Institucional da UFSC
repository.name.fl_str_mv Repositório Institucional da UFSC - Universidade Federal de Santa Catarina (UFSC)
repository.mail.fl_str_mv
_version_ 1808652276936474624

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