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Synthesis of heavy tungsten alloys via powder reduction technique

Published online by Cambridge University Press:  19 September 2016

Heba Al-Kelesh ,
K.S. Abdel Halim  and
M.I. Nasr
Heba Al-Kelesh*
Affiliation:
Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo 11421, Egypt
K.S. Abdel Halim
Affiliation:
Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo 11421, Egypt; and Department of Chemical Engineering, College of Engineering, University of Hai'l, Hail, Saudi Arabia
M.I. Nasr
Affiliation:
Central Metallurgical Research and Development Institute (CMRDI), Helwan, Cairo 11421, Egypt
*
a) Address all correspondence to this author. e-mail: hebaalkelesh@hotmail.com, hebaalkelesh@gmail.com
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Abstract

Heavy tungsten alloys with the following compositions 98W2Fe, 93W7Fe, and 95W2Fe3Ni were successfully prepared through gaseous reduction of metal oxide mixtures in the temperature range of 850–1000 °C. Reduced samples were subjected to sintering processes in reducing atmosphere (Ar/4% H2) at different temperatures (1200–1300 °C) and dwell times (30, 90 min). The prepared alloys together with the sintered samples were characterized by x-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and optical microscope. The microhardness of the sintered samples was measured and correlated to sintering temperature and dwell time. The presence of iron oxide decreases the reducibility of WO3 whereas the presence of NiO increases the reducibility of both iron oxide and tungsten oxide. With the increase of sintering temperature and dwell time, porosity of samples decreases forming dense structure which is coupled with the increase of hardness particularly for 95W2Fe3Ni alloy.

Keywords

heavy tungsten alloysreductionsinteringmetal oxidekinetics and mechanismhardnessmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 19 , 14 October 2016 , pp. 2977 - 2986
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Copyright
Copyright © Materials Research Society 2016 

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