outubro 2014 vol. 1 num. 1 - 13th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials
Full Article - Open Access.
Trial Manufacture of Functionally Graded Commutator Mado from Copper and Resin
Nakano, K.; Ishibashi, O.; Sumiya, Y.; Tateishi, K.; Miyazaki, Y.; Watanabe, K.; Osaki, T.; Hasuo, H.;
Joining between copper and resin on commutator of electromotor is usually executed by injection molding method and copper is embedded in resin. In this case, clear boundary exists between copper and resin because copper and resin are not combined chemically. This boundary will change to be gaps or cracks after a long time use. In most cases, an abrupt fracture occurs when a force is greater than a certain value applied to this cracks or crack-like defects. In this study, so as to solve this problem, trial manufacture of functionally graded commutator made from copper and resin powder has benn executed by spark plasma sintering method. The third eleent is added into resin powder and resin powder has been executed by coefficient of linear thermal expansion may become low. Several mechanical and thermophysical properties have been investigated. The value of shearing stress between cooper and copper-resin mixed layer is more than 50Mpa. It shows that the more the content of resin increases, the higher the coefficient of thermal expansion becomes. The thermal conductivity is one-dimensional and non-steady state at 296K indicated that the change is due to mixing ratio of copper and resin.
Palavras-chave: functionally graded commutator, copper, resin, phenol, spark, plasma sintering,
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Nakano, K.; Ishibashi, O.; Sumiya, Y.; Tateishi, K.; Miyazaki, Y.; Watanabe, K.; Osaki, T.; Hasuo, H.; "Trial Manufacture of Functionally Graded Commutator Mado from Copper and Resin", p. 46-49 . In: Proceedings of the 13th International Symposium on Multiscale, Multifunctional and Functionally Graded Materials [=Blucher Material Science Proceedings, v.1, n.1].
São Paulo: Blucher,
ISSN 2358-9337, DOI 10.5151/matsci-mmfgm-062-f
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