バリウム雲母を析出させた結晶化ガラスの機械的性質

概要

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Fine mica crystals (1-2μm) were precipitated by reheating glasses in the system Ba_<0.5>Mg_3 (Si_3AlO_<10>) F_2-Mg_2Al_4Si_5O_<18>-Ca_3 (PO_4)_2. This glass-ceramics were two times stronger (≈350 MPa in bending) than conventional mica-containing glass-ceramics. The glass-ceramics contained two types of mica crystals, i. e., calcium-rich type and barium-rich type. MgF_2 in the glass compositions was effective to increase the content of the barium-mica crystal. It was found that barium-rich mica crystal effectively deflected cracks to improve mechanical strength, and that calcium-rich mica crystal generated the ease of machining.
1992-03-01