选择一种出SiO2-MgO-Al2O3-K2O-CaO-P2O5-F基础玻璃体系,并添加不同量的ZnO,制备出性能良好的可切削生物微晶玻璃.结果表明,由于ZnO的添加,可使母玻璃的熔化温度由1450℃降至1300℃,可切削生物活性微晶玻璃的母玻璃能够在较低的温度熔化制备.母玻璃晶化后析出相主要为云母相和氟磷灰石相;各种晶相的组合形貌为花瓣形态,其断口呈现穿晶断裂的特征,并有晶体拔出,使材料具备了较高的强度;由于析出了较多的云母相,该微晶玻璃兼具良好的可切削性能.
A basic composition of SiO2-MgO-Al2O3-K2O-CaO-P2O5-F glass system was selected,
and different contents of ZnO were added. The melting results show that the addition of ZnO can reduce the melting temperature of the glass
from 1450℃ to 1300℃. Thus, the transparent as-cast glasses of the machinable bioactive glass ceramic can be obtained at the lower temperature.
The main phases of the glass ceramic are mainly mica phase and apatite phase after crystallization. Microstructure of the glass ceramic is petaloid-like.
The fracture of the glass ceramic is transgranular and some crystals are drawn and this feature makes the glass ceramic show high strength. The glass ceramic
also has good machinability due to the existence of mica phase.
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