臼齿多级微结构增韧机理  

Toughness Mechanism of Hierarchical Microstructure of Cheek Tooth

作　　者：陈斌[1] 程自东 蔺诗韵 方仲祺 聂书严 江智平 

机构地区：[1]重庆大学航空航天学院,重庆400044

出　　处：《陶瓷学报》2017年第6期904-907,共4页Journal of Ceramics

基　　金：国家自然科学基金(11272367)

摘　　要：作为一种天然生物陶瓷复合材料,臼齿具有多尺度微结构。它首先由羟基磷灰石层和胶原蛋白组成,进而羟基磷灰石层又是由羟基磷灰石片构成。并且相邻磷灰石层中的磷灰石片具有不同的方向,它们构成一种交叉微结构。建立臼齿层状及交叉两级微结构模型,考察了羟基磷灰石层状微结构的断裂能以及羟基磷灰石片交叉微结构的拔出力,结果表明羟基磷灰石的层状微结构增加了臼齿的断裂能,而羟基磷灰石片交叉微结构增加了磷灰石片的最大拔出力。分析结果被实验验证。臼齿通过其不同尺度上的优良微结构,使其获得优良的力学性质。As a natural bioceramic composite, cheek tooth possesses hierarchical microstructure. It consists first of hydroxyapatite layers and collagen protein matter, which make up a laminated microstructure. Further, the hydroxyapatite layers are composed of hydroxyapatite sheets. The hydroxyapatite sheets in different layers have different orientations, which compose a crossed microstructure. The two-level models of the tooth are respectively built for investigating the fracture energy of the laminated microstructure and the maximum pullout force of the crossed microstructure. It is revealed that the laminated microstructure increases the fracture energy of the tooth and the fiber-crossed microstructure enhances the maximum pullout force of the fiber sheets. The analytical result about the maximum pullout force of the crossed microstructure is experimentally validated. It can be concluded that the excellent microstructures in different hierarchies of the tooth endow the tooth with high-performance mechanical properties.

关 键 词：臼齿 羟基磷灰石 层状微结构 交叉微结构 断裂韧性 

分 类 号：TQ174.75[化学工程—陶瓷工业]