Densificação de Compósitos de Cobre-Grafite
DOI:
https://doi.org/10.5935/1809-2667.19990011Keywords:
.Abstract
Neste trabalho são apresentados os resultados obtidos no estudo de densificação de compósitos de cobre-grafite, tendo em vista a aplicação destes materiais em contatos elétricos. Foram utilizados duas composições: Cu -5 peso C e Cu -20 peso C. Os pós prensagem uniaxial em matriz de aço temperado (AE=8mm) em 200 MPa. As condições de sinterização utilizadas foram: 950° C/10min, 950° C/20min, 950° C/40min e 950° C/60min. Foram analisados os seguintes parâmetros: a variação de massa, a contração linear, a densidade aparente e a morfologia das amostras sinterizadas em função das condições de sinterização.Downloads
References
ASM Committee Electric Contact Materials, 1979. p. 662-695.
EMMER, S., HAVALDA, A. Copper-graphite Composite Material for Application to Sliding Electrical Contacts. Journal de Physique IV, v. 3, p. 1799-1806, 1993.
CHIAVERINI, V. Metalurgia do pó: técnicas e produtos. 3. ed. São Paulo: ABM, p. 270-276, 1992.
SANTOS, C. A. Estudo de compacatação e sinterização de compósitos de cobre-grafite para uso em contatos elétricos. Campos dos Goytacazes (RJ) 1998. 68p. Tese (Mestrado) - Engenharia e Ciencia dos Materiais - Universidade Estadual do Norte Fluminense - UENF.
DOMBROSKI, J.M., et al. Effect of additives on the Sintered Properties of Copper Compacts The International of Powder Metallurgy. American Powder Metallurgy Institut, v. 28, n. 1, p. 27-39, 1992.
LENEL, F.L. Powder Metallurgy: Principles and Applications. New Jersey: Princeton, 1980. p. 99-115.
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