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Influence of Thermal History on the Crystallization Behavior and Hardness of a Glass‐Ceramic
Author(s) -
Roesky Rainer,
Varner James R.
Publication year - 1991
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1991.tb04353.x
Subject(s) - materials science , crystallization , ceramic , indentation hardness , composite material , vickers hardness test , diffraction , thermal , glass ceramic , hardness , microstructure , thermodynamics , physics , optics
The glass system SiO 2 ─Al 2 O 3 ─Li 2 O─TiO 2 was examined to determine the dependence of hardness on heat‐treatment temperature. In addition to hardness measurements, X‐ray diffraction (XRD) was used to determine the type and amount of phases present and to relate this to the hardness results. Hardness increased with heat‐treatment temperature. This correlated with the amounts of crystals present, as determined by XRD. For a particular heat‐treatment temperature, when hardness was plotted versus load on the indenter, there was a load dependence. There was at first a rapid decrease as the load on the indenter increased, with a constant value being approached at higher loads.