Article In: 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

Key information

Authors:

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.

Published in

January 1, 2000

Abstract

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.

Publication details

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Publication version

AO - Author's Original

Publisher

Elsevier

Link to the publisher's version

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

Title of the publication container

International Journal of Refractory Metals and Hard Materials

First page or article number

47

Last page

53

Volume

18

Issue

1

ISSN

0263-4368

DOI

10.1016/s0263-4368(00)00014-7

Fields of Science and Technology (FOS)

materials-engineering - Materials engineering

Keywords

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

Publication language (ISO code)

eng - English

Alternative identifier (URI)

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

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