Abstract
Glass‐ceramics containing barium–mica in the system Ba0.5 Mg3 (Si3AIO10)F2–2MgO · 2Al2O3· 5SiO2–Ca3 (PO4)2 are two to three times stronger than conventional mica‐containing glass‐ceramics. Moreover, the barium‐mica glass‐ceramics are easier to machine, as confirmed by a drilling test using conventional steel tools. Such mechanical properties are attributable to the microstructure of the barium–mica glass‐ceramics. Very fine, interlocking mica crystals are precipitated in the glass, and a crack‐deflection mechanism is observed by scanning electron microscopy.
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