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Reduction-Carburization of the Oxides of Ni and W towards the Synthesis of Ni-WC Carbides
Department of Materials Science and Engineering, Royal Institute of Technology.ORCID-id: 0000-0002-2358-7719
Kungliga tekniska högskolan, KTH.
Department of Minerals Technology and Processing, Central Metallurgical Research and Development Institute (CMRDI), Cairo.
Division of Materials Process Science, Department of Materials Science and Engineering, Royal Institute of Technology, Kungliga tekniska högskolan, KTH, Department of Metallurgy, Royal Institute of Technology, Stockholm, Division of Metallurgy, Department of Materials Science and Technology, Royal Institute of Technology.
2010 (engelsk)Inngår i: Advanced Materials Forum V: selected, peer reviewed papers from the V International Materials Symposium MATERIAiS 2009 (14th meeting of SPM - Sociedade Portuguesa de Materiais), Instituto Superior Técnico, Technical University of Lisbon, April 5 - 8, Lisbon, Portugal, 2009 / [ed] Luís Guerra Rosa; Fernanda Margarido, Stafa-Zurich: Trans Tech Publications Inc., 2010, s. 952-962Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Ternary Ni-W-C cemented carbides were synthesized directly from mixture powder of NiO-WO3 by simultaneous reduction-carburization in mixed H2-CH4 gas environment in a thin bed reactor in the temperature range 973-1273K. The kinetics of the reaction was closely followed by monitoring the mass change using thermogravimetric method (TGA). The nascent particles of the metals formed by reduction could react with the gas mixture with well-defined carbon potential to form a uniform product of Ni-W-C. The gas mixture ratio was adjusted in such a way that the Ni-W-C formed was close to the two phase tie line. In view of the fact that each particle was in direct contact with the gas mixture, the reaction rate could be conceived as being controlled by the combined reduction-carburization reaction. From the reaction rate, the Arrhenius activation energies were evaluated. Characterization of the carbides produced was carried out by using X-ray diffraction, SEM-EDS as well as high resolution electron microscope (HREM). The grain sizes were also determined. Correlations were found between the carbide composition as well as grain size and the process parameters such as temperature of the reduction-carburization reaction as well as the composition of the gas mixture. The results are discussed in the light of the kinetics of the reduction of oxides and the thermodynamic constraints.

sted, utgiver, år, opplag, sider
Stafa-Zurich: Trans Tech Publications Inc., 2010. s. 952-962
Serie
Materials Science Forum, ISSN 0255-5476 ; 636
HSV kategori
Forskningsprogram
Processmetallurgi
Identifikatorer
URN: urn:nbn:se:ltu:diva-32093DOI: 10.4028/www.scientific.net/MSF.636-637.952Lokal ID: 676870d0-969f-4f58-a407-bedf9d2fa28bOAI: oai:DiVA.org:ltu-32093DiVA, id: diva2:1005327
Konferanse
Advanced Materials Forum : 05/04/2009 - 08/04/2009
Merknad
Upprättat; 2010; 20141022 (hesahm)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2018-01-11bibliografisk kontrollert

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