| Texto completo | |
| Autor(es): |
Peçanha‚ R.M.
;
Ferreira‚ F.
;
Coelho‚ G.C.
;
Nunes‚ C.A.
;
Sundman‚ B.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | INTERMETALLICS; v. 15, n. 8, p. 999-1005, 2007. |
| Resumo | |
In the present work, the Nb-B binary system was thermodynamically optimized. The stable phases in this system are BCC (niobium), Nb3B2, NbB, Nb3B4, Nb5B6, NbB2, B (boron) and liquid L. The borides Nb3B2, NbB, Nb3B4 and Nb5B6 and the B (boron) were modeled as stoichiometric phases and the liquid L, BCC (niobium) and NbB2 as solutions, using the sublattices model, with their excess terms described by the Redlich-Kister polynomials. The Gibbs energy coefficients were optimized based on the experimental values of enthalpy of formation, low temperature specific heat, liquidus temperatures and temperatures of invariant transformations. The calculated Nb-B diagram reproduces well the experimental values from the literature. (C) 2006 Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 99/06160-0 - Calculo termodinamico do sistema nb-b. |
| Beneficiário: | Rockfeller Maciel Peçanha |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |
| Processo FAPESP: | 00/08062-5 - Bo Sundman | Royal Institute of Technology - Suécia |
| Beneficiário: | Gilberto Carvalho Coelho |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |
| Processo FAPESP: | 97/06348-4 - Estudo de estabilidade de fases em ligas Nb-B-Si ricas em Nb |
| Beneficiário: | Carlos Angelo Nunes |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |