2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 5: Composite, Ceramic, Quasi-crystals, Nanomaterials & Coatings
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 578 pages |
| ISBN: | 978-1-987820-07-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Effect of different carbon sources on direct synthesis of nano tungsten carbide from scheelite
Harjinder Singh1; O.P. Pandey2;1GOVERNMENT POLYTECHNIC COLLEGE, Ferozepur, India; 2THAPAR UNIVERSITY, Patiala, India;
Type of Paper: Regular
Id Paper: 283
Topic: 14
Abstract:
Tungsten carbide (WC) is known for its exceptional tribo-mechanical properties. It is extensively used in cutting and mining tools, surface coatings, defence, chemical and electronic industries. Apart from mechanical properties, it also possesses good catalytic properties. It is considered as an economical alternative to precious noble metal platinum (Pt) used in fuel cells. Nano tungsten carbide is prepared from pure tungsten precursors like WO, W(CO)6, W, WCl6 and WCl4. These pure precursors are obtained from tungsten ore(s) through lengthy and costly extraction processes. The direct production of nano tungsten carbide from scheelite (tungsten ore) can reduce the use of chemicals and cost of production. This paper investigates the effect of different carbon sources, activated charcoal (solid) and acetone (liquid) with or without magnesium on direct reduction/carburization of scheelite to nano tungsten carbide. The reactions were carried out in an autoclave at 800°C. The impurities were removed after synthesis by washing the reaction products with dilute HCl (1:1). The results indicate that even the use of only carbon (activated charcoal or acetone) can produce nano WC. However, reaction products also contained unreacted scheelite. On the other hand, the use of solid carbon with magnesium as a reducing agent produces single phase nano tungsten carbide. The powders were characterized by X- ray diffraction, SEM and TEM.