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Influence of O and Co on the early stages of sintering of Wc-Co: A surface study by AES and STM
KTH, Superseded Departments, Materials Science and Engineering.
KTH, Superseded Departments, Metallurgy.
2000 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 48, no 17, 4357-4362 p.Article in journal (Refereed) Published
Abstract [en]

The influence of oxygen on the sintering behavior of WC-Co has been investigated by Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). Deposition of Co on the WC(0001) surface and subsequent annealing at 650 degreesC results in a 2x2 reconstructed pre-cursor layer on top of which Co grows in weakly bound islands which can be moved on the surface by the STM rip. Annealing at 850 degreesC removes excess Co and leaves only the 2x2 surface. Oxygen exposure of the 2x2 surface results in a clustered cobalt oxide overlayer which on annealing at 750 degreesC breaks up and restores the 2x2 structure as the metallic Co wets the surface.

Place, publisher, year, edition, pages
2000. Vol. 48, no 17, 4357-4362 p.
Keyword [en]
STM, AES, WC(0001), Co, O, oxides, carbide, wetting, cemented carbides, wc(0001)
URN: urn:nbn:se:kth:diva-20160ISI: 000165337900017OAI: diva2:338853
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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