Artigo De: orcid, scopus, cienciavitae

Carbide formation of Va-group metals (V, Nb and Ta) in a solar furnace

International Journal of Refractory Metals and Hard Materials

Amaral, P.M.; Fernandes, J.C.; et al. — 2000 — Elsevier

Informações chave

Autores:

Amaral, P.M. (Pedro Miguel Gomes Abrunhosa Amaral); Fernandes, J.C. (José Jorge Lopes da Cruz Fernandes); Rosa, L.G. (Luís Manuel Guerra da Silva Rosa); Martínez, D.; Rodríguez, J.; Shohoji, N.; Amaral, P. M.; et al.

Publicado em

1 de janeiro de 2000

Resumo

In our recent series of solar carbide synthesis for Si and d-group transition metals (Ti, Zr; Cr, Mo, W) using graphite (G) or amorphous carbon (aC) as carburising medium, we observed some evidences indicative of involvement of photochemical effects in the reaction process. For example, (1) graphitisation of aC was accelerated during carburisation of W under solar radiation; (2) high-temperature mono-carbide phase of Mo (α-MoC1−x) formed at a temperature appreciably lower than the lower-threshold temperature of the stability range of the α-MoC1−x phase given in the available equilibrium phase diagram for Mo–C system. In this work, we investigated solar carburisation reactions for Va-group metals (V, Nb, Ta) in Ar or N2 gas environment. For this group of metals, only carbide phases formed even in N2 atmosphere without forming carbonitride like the cases with VIa-group metals (Cr, Mo, W). For carburisation of Ta with aC in Ar, an unexpected formation of sub-carbide Ta2C besides mono-carbide TaC took place, while Ta2C phase did not form through carburisation of Ta with aC in N2 or carburisation of Ta with G in either Ar or N2 atmosphere. No graphitisation promotion for aC was detected during the carburisation of none of the Va-group elements.

Detalhes da publicação

Autores da comunidade :

Versão da publicação

AO - Versão original do autor

Editora

Elsevier

Ligação para a versão da editora

https://www.sciencedirect.com/science/article/pii/S0263436800000147?via%3Dihub

Título do contentor da publicação

International Journal of Refractory Metals and Hard Materials

Primeira página ou número de artigo

47

Última página

53

Volume

18

Fascículo

1

ISSN

0263-4368

DOI

10.1016/s0263-4368(00)00014-7

Domínio Científico (FOS)

materials-engineering - Engenharia dos Materiais

Palavras-chave

  • Vanadium
  • Niobium
  • Tantalum
  • Carbide
  • Amorphous carbon
  • Graphite
  • Solar furnace

Idioma da publicação (código ISO)

eng - Inglês

Identificador alternativo (URI)

http://www.scopus.com/inward/record.url?eid=2-s2.0-0033714980&partnerID=MN8TOARS

Acesso à publicação:

Acesso apenas a metadados