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Titel: Enhancement of fracture strength of cutted plate glass by the application of SiO2 sol-gel coatings
Verfasser: Endres, Klaus
Mennig, Martin
Amlung, Martin
Gier, Andreas
Schmidt, Helmut K.
Sprache: Englisch
Erscheinungsjahr: 1999
Quelle: Thin solid films. - 351. 1999, 1/2, S. 132-136
SWD-Schlagwörter: Glas
Biegefestigkeit
Sol-Gel-Verfahren
Rasterelektronenmikroskop
Kalknatronglas
Tetraethylsilicat <Tetraethylorthosilicat>
DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: The influence of SiO2 sol-gel coatings on the bending strength of soda lime plate glass samples has been investigated by 3 point bending and double ring bending strength measurements. The samples were prepared by manual glass cutting and were coated with two different types of SiO2 coating: A TEOS coating (thickness of about 100 nm) was obtained from sols synthesized by acid catalysis of tetraethoxysilane and a MTKS coating (thickness of about 1 &micro;m) was obtained from a methyl modified nanoparticulate SiO2 sol. The coatings were applied by dipping and were densified at 500'°C for 1 h. The fracture strength &sigma;0 of edge coated plate glass (60 x 25 x 3.8 mm), determined by 3 point bending test (according to EN 843-1), was increased after coating with TEOS from &sigma;0 = 24 MPa to 40 MPa (67% increase). The fracture strength increased to &sigma;0 = 56 MPa (133% increase) on applying MTKS or a double coating of TEOS followed by MTKS. The evaluation of these measurements using Weibull statistical analysis resulted in m values of 4.1 and 4.2 for the TEOS and MTKS coating and 3.5 for double coating (uncoated glasses m = 5.7), respectively. These results combined with high resolution secondary electron microscopy investigations led to the conclusion that the strengthening effect of the two different sol-gel systems is due to a partial flaw healing and clamping of the crack sides.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-29234
hdl:20.500.11880/24671
http://dx.doi.org/10.22028/D291-24615
SciDok-Publikation: 5-Jul-2010
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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