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Previous issue date: 2011-12-21 / Metal/ceramic interfaces using zirconia have dominated the industrial
applications in the last decade, due to the high mechanical strength and fracture
toughness of zirconia, especially at temperatures below 300 ?C. Also noteworthy is the
good ionic conductivity in high temperatures of this component. In this work joining
between ZrO2 Y-TZP and ZrO2 Mg-PSZ with austenitic stainless steel was studied.
These joints were brazed at high-vacuum after mechanical metallization with Ti using
filler alloys composed by Ag-Cu and Ag-Cu-Ni. The influence of the metallization, and
the affinity between the different groups (ceramic / filler alloys) was evaluated, in order
to achieve strong metal/ceramic joints. Evaluation of joints and interfaces, also the
characterization of base materials was implemented using various techniques, such as:
x-ray diffraction, leak test, three-point flexural test and scanning electron microscopy
with chemical analysis. The microstructural analysis revealed physical and chemical
bonds in the metal/ceramic interfaces, providing superior leak proof joints and stress
cracking, in order to a good joint in all brazed samples. Precipitation zones and reaction
layers with eutetic characteristics were observed between the steel and the filler metal / As interfaces metal/cer?micas utilizando zirc?nia t?m dominado as
aplica??es industriais na ?ltima d?cada, em virtude da alta resist?ncia
mec?nica e tenacidade ? fratura da zirc?nia, especialmente em temperaturas
abaixo de 300 ?C. Destaca-se tamb?m a boa condutividade i?nica em
temperaturas elevadas deste componente. No presente trabalho, estudou-se as uni?es
entre ZrO2 Y-TZP e ZrO2 Mg-PSZ com o a?o inox austen?tico 304. Estas jun??es foram
produzidas por brasagem a alto-v?cuo ap?s a metaliza??o mec?nica com Ti utilizandose
ligas de adi??o compostas por Ag-Cu e Ag-Cu-Ni. Avaliou-se a influ?ncia da
metaliza??o, bem como a afinidade entre os diversos grupos (cer?mica / liga de adi??o)
com o intuito de se conseguir a melhor uni?o metal/cer?mica. A avalia??o das uni?es e
interfaces, bem como a caracteriza??o dos materiais de base foi feita com recurso de
diversas t?cnicas, tais como: difra??o de raios-x, ensaios de estanqueidade, flex?o em 3-
pontos e microscopia eletr?nica de varredura com microan?lise por espectroscopia de
energia dispersiva de raios-x. A an?lise microestrutural revelou liga??es f?sicas e
qu?micas na interface metal/cer?mica, proporcionando boa estanqueidade e tens?o de
ruptura e, consequentemente, uma boa uni?o em todas as amostras brasadas. Foram
observadas zonas de precipita??o e camadas de rea??o com caracter?sticas eut?ticas
entre o a?o e o metal de adi??o
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15581 |
| Date | 21 December 2011 |
| Creators | Silva, Jo?o Moreno Vilas Boas de Souza |
| Contributors | CPF:80732810400, http://lattes.cnpq.br/8671649752936793, Martinelli, Ant?nio Eduardo, CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Paskocimas, Carlos Alberto, CPF:06296687877, http://lattes.cnpq.br/2365059843175411, Maciel, Theophilo Moura, CPF:13264850400, http://lattes.cnpq.br/9476858938351846, Nascimento, Rubens Maribondo do |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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