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Metaliza??o mec?nica com Ti de placas de Al2O3 utilizando m?quina ferramenta computadorizada para brasagem metal/cer?micaVieira, Jo?o Dantas Paiva 22 August 2015 (has links)
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Previous issue date: 2015-08-22 / Neste trabalho empregou-se a t?cnica de metaliza??o mec?nica para produzir um revestimento de metal ativo, no caso o tit?nio (Ti), no substrato cer?mico de alumina (Al2O3), a fim de favorecer o molhamento com ligas de adi??o convencionais. Utilizou-se um processo autom?tico com o emprego de uma m?quina ferramenta de controle num?rico computadorizado (CNC) sem a interven??o do operador. Posteriormente, a cer?mica metalizada foi brasada, com tubo met?lico de inox 304, por t?cnica indireta em forno de alto v?cuo, utilizando liga de adi??o convencional Ag-28Cu. A interface resultante foi caracterizada por t?cnica de an?lise micro estrutural em microsc?pio eletr?nico de varredura (MEV) acoplado com sistema de microan?lise qu?mica por energia dispersiva (EDS) e o desempenho mec?nico, por ensaio de cisalhamento, realizado em uma m?quina universal de ensaios mec?nicos, que apresentou baixos valores da tens?o de cisalhamento. A metaliza??o com tit?nio mostrou resultado satisfat?rio com pode ser observado pelas an?lises microsc?picas, enquanto a brasagem apresentou diferen?as significativas, a menor, nos resultados de resist?ncia das amostras analisadas, quando comparadas a outros trabalhos, na mesma ?rea. / In this work employed the mechanical metallization technique to produce a thin film of
titanium in the ceramic substrate of alumina (Al2O3), in order to favor wetting with
conventional adding alloys. Was used an automated process with employment a
machine tool computer numerical control (CNC) without operator intervention.
Subsequently, the metallized ceramic was brazed with metallic stainless steel tube 304,
by indirect technique in high-vacuum oven, using conventional alloying addition Ag-
28Cu. The resulting interface was characterized by technique of micro structural
analysis using scanning electron microscopy (SEM) coupled with energy dispersive
spectroscopy (EDS) for chemical microanalysis and mechanical performance, shear test,
carried out on a universal testing machine. The titanium metallization film was observed
by electron microscopy showing an interface with good interaction between the
elements of the materials involved, and the thickness of the layer of titanium fairly
regular, consistent with results in the same work area. While brazing interface presented
some defects, mainly due to the furnace atmosphere and vacuum pressure, which has
not reached the specified value, identified in other studies, which influenced, to some
extent, the mechanical results.
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