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- Alumino-silicate glass (1) (entfernen)
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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.