Fluorescence studies of polycrystalline Al2O3 composite constituents: piezo-spectroscopic calibration and applications
| dc.contributor.author | Dassios, K. G. | en |
| dc.contributor.author | Galiotis, C. | en |
| dc.date.accessioned | 2015-11-24T17:34:27Z | |
| dc.date.available | 2015-11-24T17:34:27Z | |
| dc.identifier.issn | 0947-8396 | - |
| dc.identifier.uri | https://olympias.lib.uoi.gr/jspui/handle/123456789/13967 | |
| dc.rights | Default Licence | - |
| dc.subject | optical fluorescence | en |
| dc.subject | bridging stresses | en |
| dc.subject | oxidation | en |
| dc.subject | sapphire | en |
| dc.subject | strain | en |
| dc.subject | scales | en |
| dc.subject | line | en |
| dc.subject | luminescence | en |
| dc.subject | dependence | en |
| dc.subject | crystal | en |
| dc.title | Fluorescence studies of polycrystalline Al2O3 composite constituents: piezo-spectroscopic calibration and applications | en |
| heal.abstract | Optical fluorescence microscopy (OFM) was used to quantify the effect of applied stress or strain upon the position of the R fluorescence line of alpha-Al2O3 composite constituents (fibers and matrices) prior to composite processing. Polycrystalline Nextel(TM) Nextel 720 fibers were tested under tension and compression by means of a cantilever beam technique, whereas the polycrystalline matrix was tested in compression. The position of the R fluorescence line was correlated to applied strain and stress in order to provide the piezo-spectroscopic calibration curve and the corresponding coefficients for both sensors, which form the basis for interpretation of frequency shifts from full, all-alumina, composites. The piezo-spectroscopic coefficients of the polycrystalline matrix were found to be 2.57 cm(-1) GPa(-1) and 2.52 cm(-1) GPa(-1) for the R1 and R2 lines respectively, whereas the coefficients for the polycrystalline alpha-Al2O3 Nextel 720 fibers were found to be 3.07 cm(-1) GPa(-1) and 2.91 cm(-1) GPa(-1) for the R1 and R2 lines, respectively. The effects of collection probe size, as well as penetration depth, are discussed. The established piezo-spectroscopic behavior is used inversely to quantify the residual stresses in the as-received fibers due to the presence of sizing, as well as in the thermally grown alumina layer of an industrial thermal barrier coating. | en |
| heal.access | campus | - |
| heal.fullTextAvailability | TRUE | - |
| heal.identifier.primary | DOI 10.1007/s00339-002-2075-3 | - |
| heal.identifier.secondary | <Go to ISI>://000221675000042 | - |
| heal.journalName | Applied Physics a-Materials Science & Processing | en |
| heal.journalType | peer reviewed | - |
| heal.language | en | - |
| heal.publicationDate | 2004 | - |
| heal.publisher | Springer | en |
| heal.recordProvider | Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Μηχανικών Επιστήμης Υλικών | el |
| heal.type | journalArticle | - |
| heal.type.el | Άρθρο Περιοδικού | el |
| heal.type.en | Journal article | en |
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