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Phase transformation in kappa- and gamma-Al2O3 coatings on cutting tool inserts
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Materials Science . Linköping University, The Institute of Technology.ORCID iD: 0000-0002-9840-7364
Sandvik Tooling AB.
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2009 (English)In: Surface & Coatings Technology, ISSN 0257-8972, Vol. 203, no 12, 1682-1688 p.Article in journal (Refereed) Published
Abstract [en]

The phase transformation in as-deposited, metastable kappa- and gamma-alumina coatings on cutting inserts has been studied by a combination of X-ray diffraction, scanning electron microscopy and cathodoluminescence. In the case of kappa-alumina, mechanical forces during metal cutting lower the transformation temperature of the metastable phases to the thermodynamically stable alpha-alumina phase from 1050 degrees C to 930 degrees C. This is the reason why that coating has a similar performance during metal cutting when compared to the stable ce-alumina phase. The transformation temperature in gamma-alumina coated cutting tools is found to be as low as 950-975 degrees C. Cathodoluminescence (CL) has been demonstrated as a possible method for differentiation between the various alumina phases. Specifically, both kappa- and gamma-alumina films have revealed a strong room temperature CL with different peak energies depending on the phase. CL of the metastable alumina coatings annealed at the transformation temperatures corresponds to the stable alpha-alumina phase.

Place, publisher, year, edition, pages
2009. Vol. 203, no 12, 1682-1688 p.
Keyword [en]
Alumina, Phase transformation, Coatings, X-ray diffraction, Cathodoluminescence
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-17601DOI: 10.1016/j.surfcoat.2008.12.028OAI: oai:DiVA.org:liu-17601DiVA: diva2:210778
Available from: 2009-04-06 Created: 2009-04-06 Last updated: 2016-08-31

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Trinh, DavidPozina, GaliaHultman, LarsHögberg , Hans

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