A novel approach for direct synthesis of nanocrystalline tungsten carbide from milled scheelite ore

Harjinder Singh, O. P. Pandey

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

In recent years, nanostructured tungsten carbide (WC) has been synthesized mainly from precursors like WO3, W, WCl6, and WCl 4. These pure precursors are obtained by multistep high temperature treatments from the ore. Single phase nanocrystalline WC has been synthesized for the first time from scheelite ore at significantly lower [923 K (650°C)] temperature. The activated charcoal and Mg turnings have been used as carbon source and reducing agent, respectively. The effect of time and temperature on the reaction has been investigated. The reaction by-products and impurities were washed firstly with dilute HCl and then with dilute base. The powders were characterized by X-ray diffraction technique and high resolution transmission electron microscope. The XRD patterns were refined by Rietveld method. The WC crystallite size was observed to decrease with lowering of synthesis temperature. The average crystallite size of WC formed was 20 nm. This report presents an exclusive, straight forward, environment friendly, and reproducible method for synthesis of nanocrystalline WC directly from scheelite ore.

Original languageEnglish
Pages (from-to)1428-1434
Number of pages7
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume44
Issue number6
DOIs
StatePublished - Dec 2013
Externally publishedYes

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