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Effect of microscale shear stresses on the martensitic phase transformation of nanocrystalline tetragonal zirconia powders
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.ORCID iD: 0000-0001-8775-0602
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2010 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 30, no 13, p. 2749-2755Article in journal (Refereed) Published
Abstract [en]

For the first time, the effect of microscale shear stress induced by both mechanical compression and ball-milling on the phase stability of nanocrystalline tetragonal zirconia (t-ZrO2) powders was studied in water free, inert atmosphere. It was found that nanocrystalline t-ZrO2 powders are extremely sensitive to both macroscopic uniaxial compressive strain and ball-milling induced shear stress and easily transform martensitically into the monoclinic phase. A linear relationship between applied compressive stress and the degree of tetragonal to monoclinic (t→m) phase transformation was observed. Ball-milling induced microscale stress has a similar effect on the t→m phase transformation. Furthermore, it was found that even very mild milling condition, such as 120 rpm, 1 h (0.5mm balls) was enough to induce phase transformation. Surfactant assisted ball-milling was found to be very effective in de-agglomeration of our nanocrystalline porous ZrO2 particles into discrete nanocrystals. However, the t→m phase transformation could not be avoided totally even at very mild milling condition. This suggests that the metastable t-ZrO2 is extreme sensitive to microscale shear stress induced by both mechanical compression and ball-milling. The findings presented in this work are very important in further understanding the stress-induced phase transformation of nanocrystalline t-ZrO2 powders in a water free atmosphere and their further stabilization in industrially relevant solvents.

Place, publisher, year, edition, pages
2010. Vol. 30, no 13, p. 2749-2755
Keywords [en]
Biomedical application, Composites, Milling, Phase transformation, ZrO2
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-27048DOI: 10.1016/j.jeurceramsoc.2010.05.025OAI: oai:DiVA.org:ri-27048DiVA, id: diva2:1054052
Note

A2056

Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2018-07-06Bibliographically approved

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Ahniyaz, Anwar

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