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AbstractAbstract
[en] The low resistance of Nb to oxidation has restricted its use to temperatures that are relatively low in comparison to its (high) melting point. Recently it has been observed that the resistance to oxidation can be increased through the presence of the B allotropic form of Nb2O5. The oxidation of Nb was studied in the temperature range between 750 and 8500C and under oxygen pressure from 0,1 to 0,8 atmosphere. Identification of the phases present in the oxidation layer was emphasized and the temperature and the pressure conditions necessary for the appearance of the B-Nb2O5 allotropic form were investigated. (Author)
[pt]
A baixa resistencia a oxidacao do Nb tem restringido a utilizacao do metal a temperaturas relativamente baixas comparadas ao seu ponto de fusao. Recentemente constatou-se a possibilidade de aumentar a resistencia a oxidacao de ligas a base de Nb por meio da forma alotropica B do Nb2O5. Estuda-se a oxidacao de Nb em temperaturas compreendidas entre 750 e 8500C e pressoes entre 0,1 e 0,8 atm de O2. A enfase foi dada a identificacao das fases presentes na camada oxidada e procurou-se verificar a melhor relacao pressao/temperatura para o aparecimento da forma alotropica B do Nb2O5. (Autor)Original Title
Efeito da pressao e temperatura na obtencao da forma alotropica B do Nb2O5 durante oxidacao do niobio
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1981; 11 p; 36. Annual Congress of ABM; Recife (Brazil); 5 - 10 Jul 1981
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Miscellaneous
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Conference
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