Optimization of mechanical and tribological properties of a dental SiO2-Al2O3-K2O-CaO-P2O5 glass-ceramic
Optimization of mechanical and tribological properties of a dental SiO2-Al2O3-K2O-CaO-P2O5 glass-ceramic
复制标题
牙科 SiO2-Al2O3-K2O-CaO-P2O5 微晶玻璃机械和摩擦学性能的优化
DOI：
10.1016/j.jmbbm.2019.103523
复制
发表时间：
2020
影响因子：
3.9
通讯作者：
Yang Bingbing
中科院分区：
文献类型：
--
作者：
Wang Gaoqi;Fu Kun;Wang Shouren;Yang Bingbing
以氟磷灰石为主晶的牙科微晶玻璃常用作饰面瓷。然而，在临床上，瓷的失效以断裂或过度磨损的形式发生。研究了SiO2-Al 2 O3-K2 O-CaO-P2 O 5氟磷灰石微晶玻璃的显微结构对其力学性能和摩擦学性能的影响，并通过调整含量和烧结工艺来提高其综合性能。采用烧结法制备了不同CaO含量和热处理制度的微晶玻璃。用X射线衍射仪和扫描电镜对样品的相组成和晶体长度进行了表征。结合力学性能，研究了干润滑和人工唾液润滑条件下的摩擦磨损行为。结果表明，不同的CaO含量和热处理温度可以改变氟磷灰石主晶的结晶度。较大的结晶度改善了机械性能，显著影响摩擦和磨损行为。当CaO含量为6.0wt%、烧结温度为1100 °C时，试样的综合性能最好，表现出优异的力学性能和耐磨性。
Dental glass-ceramics with main crystal of fluorapatite are usually employed as veneering porcelain. However, failure of the porcelain happens clinically in the form of fracture or excessive wear. The aims of the study were to evaluate the influence of microstructures of a SiO2–Al2O3–K2O–CaO–P2O5fluorapatite glass-ceramic on its mechanical properties and tribological behaviors, and to improve the comprehensive performance by adjusting content and sintering process. The glass-ceramics were fabricated by sintering method with different CaO contents and heat treatment regimes. Phase compositions and crystal length of specimens were characterized by X-ray diffractometer and scanning electron microscope. Combined with mechanical properties, friction and wear behaviors in both dry and artificial saliva lubrication conditions were investigated. The results show that different content of CaO and heat treatment temperature could change crystallinity of main fluorapatite crystal. Larger crystallinity improves the mechanical properties, significantly influencing friction and wear behaviors. The specimens with 6.0 wt % CaO and sintered at 1100 °C have the best comprehensive performance, which show excellent mechanical properties and wear resistance.