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Previous issue date: 2016-06-30 / O comp?sito Mo-Cu ? muito usado como material para contatos el?tricos e dissipadores de calor devido ?s excelentes propriedades do cobre de condutividade t?rmica e el?trica e boa trabalhabilidade, aliada ? alta resist?ncia a solda e eros?o por arco el?trico do molibd?nio. No primeiro caso, formas bastante simples s?o exigidas e a infiltra??o de cobre l?quido em um esqueleto de molibd?nio pr?-sinterizado ? a t?cnica de consolida??o normalmente utilizada. Diferentemente, geometrias mais complexas e densidades iguais ou pr?ximas da te?rica s?o necess?rias para aplica??o como dissipadores de calor. A metalurgia do p? atrav?s das t?cnicas de prepara??o de p?s com processamento por moagem de alta energia, compacta??o ou moldagem de p? por inje??o e sinteriza??o ? uma rota bastante vi?vel para produ??o desses componentes. Entretanto, a baixa solubilidade entre cobre e molibd?nio dificulta a obten??o de densidade igual ou pr?xima da densidade te?rica. Este trabalho investiga a obten??o do comp?sito Mo-27,82%?Cu preparado por moagem de alta energia e mistura mec?nica dos p?s de cobre e heptamolibdato de am?nio (HMA) de f?rmula qu?mica (NH4)6Mo7O24 .4H2O, decomposto e reduzido por H2, antes e durante a sinteriza??o, evidenciando duas rotas de fabrica??o diferentes para o material. A influ?ncia da press?o de compacta??o na densifica??o e microestrutura do comp?sito Mo-27,82%?Cu tamb?m foi investigada. Para isto, os p?s mo?dos por 50 horas foram prensados a 200, 400 e 600 MPa. Para se entender o efeito da temperatura na densidade e microestrutura do comp?sito Mo-27,82%?Cu, amostras foram sinterizadas a 1000, 1100 e 1200 oC. Os corpos prensados a 200 e 400 MPa e sinterizados a 1200 oC alcan?aram a maior densidade entre as amostras produzidas, no valor de 94?0,4 % da densidade te?rica. Por?m, aqueles que foram decompostos e reduzidos durante a sinteriza??o apresentaram trincas de fabrica??o. J? os corpos sinterizados a 1100 oC atingiram o maior valor de microdureza (571,70?78,82 HV), apesar de uma baixa densidade em rela??o a te?rica (79,17?1,78%). / The Mo-Cu composite is a material used for electrical contact and heat sinks due its excellent properties of thermal and electrical conductivity and cooper good workability allied to its great resistance welding and electrical arc erosion of molybdenum. In the first case, simple shapes are required and the infiltration of the pre-sintered molybdenum skeleton with liquid copper is the technique of consolidation normally used. On the second case, more complex geometries and a density near or equal the theoretical density are required for the application as heat sink. The powder metallurgy is a very viable route for the production of these components, through the techniques of powder preparation processed by mechanical alloying, compaction or casting. However, the low dissolution of one component in the other and the liquid copper high contact angle on the molybdenum phase difficult the obtainment of a density near or equal the theoretical density. This research investigates the obtainment of the Mo-27,82%?Cu composite prepared by mechanical alloying and mechanical mix of the copper powders and ammonium heptamolybdate (HMA) of chemical formula (NH4)6Mo7O24 .4H2O, decomposed and reduced by ?2 before and during the sintering, showing two different fabrication routes for the material. The compaction pressure influence at the densification and microstructure of the Mo-27,82%?Cu composite were also investigated. For this, the powder milled for 50 hours and the mixed powder were pressed at 200, 400 and 600 MPa. In order to understand the temperature effect at the density and microstructure were sintered at 1000, 1100 and 1200 ?C. The bodies pressed at 200 and 400 MPa and sintered at 1200?C reached 94?0,4 % of the theoretical density. However, those which were decomposed and reduced during sintering showed manufacturing cracks. On the other hand, the bodies sintered at 1100 ?C reached the highest microhardness value (571,70?78,82 HV), despite a low theory density (79.17 ? 1.78%).
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21685 |
| Date | 30 June 2016 |
| Creators | Assun??o, Rodolfo Albuquerque Buarque de |
| Contributors | 45327220478, Silva, Angelus Giuseppe Pereira da, 30814111491, Alves J?nior, Clodomiro, 09621199468, Gomes, Uilame Umbelino, 05012180410, Costa, Francine Alves da |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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