Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5463243 | Materials Letters | 2017 | 10 Pages |
Abstract
Glasses with the composition 41ZnO·49SiO2·4La2O3·6Al2O3 were crystallized 100 K above glass transition temperature. This resulted in the surface crystallization of an unknown phase chemically close to willemite. After 20 h, a 85 µm thick surface layer was formed which was composed of dendrite-like structures and an interpenetrating glass phase. The bulk glass has a coefficient of thermal expansion much larger than that of the surface layer. This leads to compressive stresses at the surface and a notable increase in the mechanical strength. After crystallization for 20 h at 800 °C, a four point bending strength of 219 MPa was reached while the glass shows a strength of 73 MPa. This may help to improve the mechanical properties of glasses and might also be important for ceramic glazes.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Christian Bocker, Christian Funke, Christian Rüssel,