Effects of wet and dry milling conditions on properties of mechanically alloyed and sintered W–C and W–B₄C–C composites

Authors: Ünal, N.¹; Öveçoğlu, M. L.²

Source: Powder Metallurgy, Volume 52, Number 3, September 2009 , pp. 254-265(12)

Buy & download fulltext article:

Price: $48.00 plus tax (Refund Policy)

Abstract:

Tungsten based W–1C and W–2B₄C–1C (wt-%) powders synthesised by mechanical alloying (MA) for milling durations of 10, 20 and 30 h, in wet (ethanol) and dry conditions, were characterised. X-ray fluorescence spectroscopy investigations revealed Co contamination which increased with increasing milling time during wet milling. X-ray diffraction investigations revealed the presence of W and WC phases in all powders, Co₃C intermetallic in the wet milled W–1C powders and W₂B intermetallic phase in both wet and dry milled W–2B₄C–1C powders. As blended and MA processed powders were consolidated into green compacts by uniaxial cold pressing at 500 MPa and solid phase sintered at 1680°C under hydrogen and argon atmospheres for 1 h. X-ray diffraction investigations revealed the presence of W₂C intermetallic phase in sintered composites produced from both wet and dry milled W–1C powders and the W₂B intermetallic phase in sintered material from the wet milled W–2B₄C–1C powder. Sintered composites from wet milled powders showed relative densities >91%, with the maximum density of 99·5% measured for the sintered 30 h wet milled W–2B₄C–1C composites. Microhardness values for the wet milled W–1C and W–2B₄C–1C composites were 2–2·5 times higher than those for dry milled composite powders. A maximum hardness value of 23·7±2·1 GPa was measured for the sintered W–2B₄C–1C composite wet milled for 20 h.

Keywords: CHARACTERISATION; BORON CARBIDE; MECHANICAL ALLOYING; TUNGSTEN; SINTERING

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/003258909X12490463446434

Affiliations: 1: Department of Metallurgical and Materials Engineering, Faculty of Chemistry-Metallurgy, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey;, Email: nil_unal@yahoo.com 2: Department of Metallurgical and Materials Engineering, Faculty of Chemistry-Metallurgy, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey

Publication date: 2009-09-01

More about this publication?

Authors wishing to cite fast track papers should give the journal name and the article DOI. This will enable reference linking via CrossRef and allow forward and backward citation tracking systems to associate the fast track citation with the final journal reference.
Editorial Board
Information for Authors
Subscribe to this Title
Terms & Conditions
Online submission site
ingentaconnect is not responsible for the content or availability of external websites