Synthesising Carbo-Nitrides of some D-Group Transition Metals Using a Solar Furnace at PSA

Nobumitsu Shohoji; Fernando A. Costa Oliveira; Luis Guerra Rosa; José Cruz Fernandes; Teresa Magalhães; Manuel Caldeira Coelho; José Rodríguez; Inmaculada Cañadas; Carlos Ramos; Diego Martínez

doi:10.4028/www.scientific.net/MSF.730-732.153

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HomeMaterials Science ForumMaterials Science Forum Vols. 730-732Synthesising Carbo-Nitrides of some D-Group...

Synthesising Carbo-Nitrides of some D-Group Transition Metals Using a Solar Furnace at PSA

Abstract:

Carbo-nitride synthesis was undertaken using a solar furnace at PSA in flowing N₂/Ar gas mixture under total pressure 1 atm and processing temperature T = 1600°C for some d-group transition elements (Ti; Zr, V, Nb, Mo, W) starting from 1.5G/M (graphite/metal powder mixture with mole ratio 1.5:1) compact to ensure co-presence of free carbon with the reaction product. Clear X-ray diffraction (XRD) evidence of formation of carbo-nitride was detected for Ti (IVa group metal) showing higher N content in the carbo-nitride synthesised in N₂ gas environment at partial pressure p(N₂) = 1 atm than that at p(N₂) = 0.5 atm. For M = V and Nb (Va group metals), formation of mono-carbide MC single-phase was detected in the N₂ environment showing no evidence of formation of carbo-nitride in spite of presence of N₂ in the environment. For M = Mo and W (VIa group metals), formation of higher carbide, among several options of carbide phases, appeared to be promoted in the N₂ gas environment although, like in cases with the Va group metals, no evidence of dissolution of N into the reaction product was detected. As such, at T = 1600°C in N₂ gas environment up to p(N₂) = 1 atm under concentrated solar beam, carbo-nitride formed from the 1.5G/M mixture only for IVa group metal (Ti) but not for Va and VIa group metals. Anyway, it seemed certain that N₂ gas affected somehow the reaction path between G and M to yield the carbide phase for M = V, Nb, Mo and W.

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Periodical:

Materials Science Forum (Volumes 730-732)

Pages:

153-158

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.730-732.153

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Online since:

November 2012

Authors:

Nobumitsu Shohoji, Fernando A. Costa Oliveira, Luis Guerra Rosa, José Cruz Fernandes, Teresa Magalhães, Manuel Caldeira Coelho, José Rodríguez, Inmaculada Cañadas, Carlos Ramos, Diego Martínez

Keywords:

Carbo-Nitride, Non-Stoichiometry, Solar Furnace, Synthesis

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References

[1] E.K. Storms, Refractory Carbides, Academic, New York, 1968.

Google Scholar

[2] H. Matzke, Diffusion in carbides and nitrides: Unsolved problems, Defect and Diffusion Forum 83 (1992) 111-130.

DOI: 10.4028/www.scientific.net/ddf.83.111

Google Scholar

[3] M.-A. Nicolet, Diffusion barriers in thin films, Thin Solid Films 52 (1978) 415-443.

DOI: 10.1016/0040-6090(78)90184-0

Google Scholar

[4] J. Rodríguez, D. Martínez, L. Guerra Rosa, J. Cruz Fernandes, P.M. Amaral, N. Shohoji, Photochemical effects in carbide synthesis of d-group transition metals (Ti, Zr; V, Nb, Ta; Cr, Mo, W) in a solar furnace at PSA (Plataforma Solar de Almería), J. Solar Energy Engineering 123 (2001) 109-116.

DOI: 10.1115/sed2001-163

Google Scholar

[5] H. Becker, U. Zwicker, Gase und Kohlenstoff in Metallen, edited by E. Fromm and E. Gebhardt, Springer-Verlag, Berlin, Heidelberg, New York (1976), pp.397-419.

DOI: 10.1002/mawe.19770080708

Google Scholar

[6] J. Cruz Fernandes, C. Anjinho, P.M. Amaral, L. Guerra Rosa, J. Rodríguez, D. Martínez, F.A. Costa Oliveira, N. Shohoji, Characterisation of solar-synthesised TiCx (x = 0.50, 0.625, 0.75, 0.85, 0.90 and 1.0) by X-ray diffraction, density and Vickers microhardness, Mater. Chem. Phys. 77 (2002) 711-718.

DOI: 10.1016/s0254-0584(02)00131-1

Google Scholar

[7] S. Nagakura, T. Kusunoki, F. Kakimoto, Y. Hirotsu, Lattice parameter of the non-stoichiometric compound TiNx, J. Appl. Cryst. 8 (1975) 65-66.

DOI: 10.1107/s0021889875009545

Google Scholar

[8] J. Cruz Fernandes, F.A. Costa Oliveira, B. Granier, J.M. Badie, L. Guerra Rosa, N. Shohoji, Kinetic aspects of reaction between tantalum and carbon material (active carbon or graphite) under solar radiation heating, Solar Energy 80 (2006) 1553-1560.

DOI: 10.1016/j.solener.2006.01.001

Google Scholar

[9] N. Shohoji, L. Guerra Rosa, J. Cruz Fernandes, D. Martínez, J. Rodríguez, Catalytic acceleration of graphitisation of amorphous carbon during synthesis of tungsten carbide from tungsten and excess amorphous carbon in a solar furnace, Mater. Chem. Phys. 58 (1999) 172-176.

DOI: 10.1016/s0254-0584(98)00275-2

Google Scholar

[10] F.A. Costa Oliveira, J. Cruz Fernandes, J.M. Badie, B. Granier, L. Guerra Rosa, N. Shohoji, High meta-stability of tungsten sub-carbide W2C formed from tungsten/carbon powder mixture during eruptive heating in a solar furnace, Internat. J. Refractory Met. Hard Mater. 25 (2007) 101-106.

DOI: 10.1016/j.ijrmhm.2006.03.001

Google Scholar

[11] N. Shohoji, T. Magalhães, F.A. Costa Oliveira, L. Guerra Rosa, J. Cruz Fernandes, J. Rodríguez, I. Cañadas, D. Martínez, Heterogeneity along the height in disc specimens of graphite/tungsten powder mixtures with sub-stoichiometric carbon atom ratios heated by concentrated solar beam to 1600ºC, Mater. Trans. 51 (2010) 381-388.

DOI: 10.2320/matertrans.m2009313

Google Scholar

[12] N. Shohoji, J.M. Badie, B. Granier, F.A. Costa Oliveira, J. Cruz Fernandes, L. Guerra Rosa, Formation of hexagonal h-MoC1-x phase at a temperature lower than 1660ºC by solar radiation heating under presence of excess free carbon, Internat. J. Refractory Met. Hard Mater. 25 (2007) 220-225.

DOI: 10.1016/j.ijrmhm.2006.05.004

Google Scholar