article posted 30 March 2016
B.Sc. Chemistry Goethe-University Frankfurt a.M. M.Sc. Chemistry Goethe-University Frankfurt a.M.
M.Sc. Thesis at the Federal Institute of Materials Research and Testing (BAM)
PhD Student Clausthal University of Technology Topic: Glass structures with low hydrogen and helium permeability
Supervisor: Prof. Dr. J. Deubener
Indentation study of zinc aluminosilicate glasses
Thorben Welter*1, Marianne Nofz2, Joachim Deubener1
Zinc aluminosilicate glasses are studied by Vickers indentation in order to reveal the effect of non- bridging oxygen (NBO) and incorporation of aluminium in the silica network on micromechanical properties.
Therefore glasses of perzinc and peraluminous compositions as well as nominal NBO-free glasses
on the meta-aluminous join are prepared by melt quenching.
To investigate the effect of environment on hardness, crack generation and propagation
indentation was performed in air and in dry nitrogen atmosphere on HF etched surfaces.
For constant silica fractions the increase in the Zn-to-Al ratio led to a characteristic
step-like course of the micromechanical properties at the meta-aluminous composition.
The effect of the cation size is verified by comparing the results with those obtained in
the calcia-alumina-silica system .
 A. P÷nitzsch, M. Nofz, L. Wondraczek, J. Deubener, "Bulk elastic properties, hardness and fatigue of calcium aluminosilicate glasses in the intermediate-silica range", Journal of Non- Crystalline Solids 2016, 434, 1-12.
1 Institute of Non-Metallic Materials, Clausthal University of Technology
2 Federal Institute of Materials Research and Testing (BAM)