The influence of technical factor and ingredient design on crystallization behavior of MgO-SiO_2-Al_2O_3-B_2O_3-KF glass-ceramics

摘要

In this paper, the the micro crystallization behavior of MgO-SiO_2-Al_2O_3-B_2O_3-KF glass-ceramics which was prepared by sintering and water quenching method was discussed. The study indicated that the compacts shrinkage of MgO-SiO_2-Al_2O_3-B_2O_3-KF glass-ceramics were related to its vitrification and its component crystallization degree;;about the density of sintered compacts, the higher the crystallization degree, the higher the dense it owns. The conclusion reached above is significant in dimension control to the produce process. In the samples when the proportion of ingredient was closer to the atomic ratio of mica crystal, the higher the micro crystallization degree of the glass-ceramics will be. When sintering temperatuer is 1000oC,the MgO-SiO_2-Al_2O_3-B_2O_3-KF glass-ceramics begain to present the crystallization;;when it achieves to 1050°C, the crystallization degree is highest; continue to increase the sintering temperature, the micro crystallization will be melted again.