95. Manufacturing of Thick Layers Made from Nanosized SiO2 Powders by dip-Coating
- Edgar Lara-Curzio and
- Michael J. Readey
Published Online: 26 MAR 2008
Copyright © 2004 The American Ceramics Society
28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4
How to Cite
Fehringer, G. and Clasen, R. (2004) Manufacturing of Thick Layers Made from Nanosized SiO2 Powders by dip-Coating, in 28th International Conference on Advanced Ceramics and Composites B: Ceramic Engineering and Science Proceedings, Volume 25, Issue 4 (eds E. Lara-Curzio and M. J. Readey), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470291191.ch95
- Published Online: 26 MAR 2008
- Published Print: 1 JAN 2004
Print ISBN: 9780470051528
Online ISBN: 9780470291191
- bioceramic system;
- rietveld method;
- x-ray powder diffraction;
- polycrystalline materials
The sol-gel process is one of the most commonly used techniques realizing thin coatings by dip-coating on different substrates, such as glass. However the thickness of the layers is limited to a few hundred nanometers. For making layers thicker than 1 urn there are other techniques like dip-coating with aqueous suspensions. Such layers can improve the wear and chemical resistance of glasses.
The Manufacturing of thick SiO2-layers with a thickness of more than 4 fim (green stage) can be made by dip-coating with aqueous suspensions on borosilicate glass. These suspensions are made of nanosized fumed silica (DEGUSSA, Aerosil OX50). By adding methylcellulosis (MC, Sigma-Aldrich) as binder it is possible to increase the maximum layer thickness to about 7 μm.
The layers were sintered with a CO2 laser. Applying this gradient method it is possible to sinter high-temperature materials on thermally sensitive substrates. The thickness of layers made by suspension consisting a binder, were about 3 μm after sintering.
The green and sintered layers were characterized by profilometry, scratch-test and HR-SEM.