Browsing Teses e dissertações by Subject "Atmosfera de oxigênio"
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Caracterização de sistemas varistores a base de SnO2-MnO2.
(Universidade Federal de São Carlos, UFSCar, Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM, , 02/08/2002)This work focussed on the effect of addition of Nb2O5 on the electrical and microestructural properties of SnO2-MnO2 based ceramics. It was also studied the effect of heat-treatments in a oxygen-rich atmosphere in these ...