摘要
采用熔铸法制备SiO2-Al2O3-MgO-CaO-F玻璃陶瓷,然后进行整体晶化;通过显微结构和物相分析、力学性能检测等手段,研究玻璃陶瓷的相组成对抗弯强度、断裂韧性和显微硬度等力学性能的影响。结果表明:通过调整原料成分配比,可实现对玻璃陶瓷中不同晶相含量的调整;随玻璃陶瓷中氟磷灰石成分(CaHPO4+CaCO3+CaF2)的含量增加,力学性能明显提高;当原料中氟磷灰石成分的理论配比(质量分数)达到40%时,玻璃陶瓷的抗弯强度、断裂韧性、显微硬度都达到实验范围内的最大值,分别为93.22 MPa、3.74 MPa·m1/2和698 MPa。相组成对SiO2-Al2O3-MgO-CaO-F玻璃陶瓷力学性能的影响主要归因于各种析出相对玻璃陶瓷的增韧效果。
SiO2-Al2O3-MgO-CaO-F？ based glass-ceramics were prepared by fusion casting method. The crystallization heat treatment was carried out according to overall crystallization method. The effect of phase composition on the mechanical properties of the glass-ceramics was investigated by SEM, XRD and mechanical performance testing. The results show that the content of the crystal phases in the glass-ceramics can be controlled by adjusting the composition of raw material. With increasing fluorapatite, the mechanical properties of the glass-ceramics are improved significantly. When the nominal fluorapatite content attains to 40%, the mechanical properties have been achieved the top value with bend strength of 93.22 MPa, fracture toughness of 3.74 MPa·m1/2 and microhardness of 698 MPa, respectively. The effect of phase composition on the mechanical properties of SiO2-Al2O3-MgO-CaO-F？ based glass-ceramics attributes to the toughening effect of the crystal phases.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2013年第5期693-699,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(51021063)
中央高校基础研究基金资助项目(2011JQ002)
关键词
玻璃陶瓷
力学性能
氟磷灰石
析出相
glass-ceramics
mechanical properties
fluorapatite
crystal phases
