This review paper characterizes glass-ceramics containing mica as main crystal phase. The phase formation reactions in dependence of the chemical composition and the microstructure are shown. Microstructure of mica glass-ceramics has been studied by electron replica and scanning electron microscopic (SEM) techniques.
Mica glass-ceramics have previously been developed in Si02-B20rA120rMgO-F--base glasses. The material is machinable because of the precipitation of micas of fluorophlogopite-type. Also, a machinable glass-ceramic for dental applications was developed based on KMg2_5(Si40 10)F2-micas. We developed mica glass-ceramics in the Si02-Al20rMgO-NaiO-K20-F glass system. Phase formation within these glasses was observed by SEM. A double controlled nucleation and crystallization of mica and apatite crystals was possible in glasses of the SiOrMgO-NaiO-K20-F-CaO-P20s-(Al20 3) system. The main crystal phases of phlogopite-type were characterized by SEM and energy dispersive x-ray spectroscopy (EDS) and apatite crystals Ca5(P04)J(OH,F) were analyzed by X-ray diffraction measurements. The glass-ceramics are useful biomaterials for bone substitution. EDS analysis shows the ion exchange between glass-ceramics and body fluids. The interface reaction is characterized by formation of a small phosphate layer, and particularly by alkali ion exchange.
Holand, W.; Gotz, W.; Carl, G.; and Vogel, W.
"Microstructure of Mica Glass-Ceramics and Interface Reactions between Mica Glass-Ceramics and Bone,"
Cells and Materials: Vol. 2
, Article 2.
Available at: http://digitalcommons.usu.edu/cellsandmaterials/vol2/iss2/2