Please use this identifier to cite or link to this item: doi:10.22028/D291-24624
Title: Enhancement of fracture strength of cutted plate glass by the application of SiO2 sol-gel coatings
Author(s): Endres, Klaus
Mennig, Martin
Amlung, Martin
Gier, Andreas
Schmidt, Helmut K.
Language: English
Year of Publication: 1999
OPUS Source: High-performance coatings for transparent systems in large-area and, or high-volume applications : September 6 - 10, 1998 / 2nd International Conference on Coatings on Glass, ICCG. [H. Pulker ..., ed.]. - Amsterdam : Elsevier, 1999, S. 204-208
SWD key words: Glasscheibe
Tetraethylsilicat <Tetraethylorthosilicat>
DDC notations: 620 Engineering and machine engineering
Publikation type: Conference Paper
Abstract: 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 to this record: urn:nbn:de:bsz:291-scidok-29328
ISBN: 0-444-50247-5
Date of registration: 9-Jul-2010
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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