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Nanoindentation creep behavior of enamel biological nanocomposites

机译：搪瓷生物纳米复合材料的纳米压痕蠕变行为

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摘要

Creep behaviour and mechanical properties of developing and mature porcine molar enamels in natural, lyophilized and burnt states were investigated by an AFM-attached nanoindentation system. The natural premature enamel has nearly 3 to 15 times more creep than mature enamel because of abundant organics and water contents. The natural mature enamel has the balanced mechanical properties, i.e., relatively high modulus and hardness with viscoelastic/viscoplastic deformation ability. After lyophilization, the mature enamel and those at late maturation stage had a significant increase in creep, while those at the transition stage with higher organics content showed slight but not statistically significant increase. A heat treatment to 600 degrees C destroyed most organics and led to the crystal growth of HAp crystallites in enamel mineral. As a result, the modulus and hardness of the burnt samples were significantly increased, while the ability of viscous deformation was compromised. A small amount of soft organic matrix between the nanoscale building units of hard mineral is thus one of the important factors for the stress transfer, as well as the viscous deformation. More significantly, water seems to play a vital role for the organics to fulfil its function and is essential in the design of the natural biological nanocomposite to resist external force. This study can provide a deeper understanding of the relationship between enamel's composition, structure and mechanical performance.
机译：通过附有AFM的纳米压痕系统研究了处于自然，冻干和燃烧状态的发育中和成熟的猪磨牙瓷釉的蠕变行为和力学性能。由于丰富的有机物和水含量，天然的过早瓷釉的蠕​​变比成熟的瓷釉高近3至15倍。天然的成熟搪瓷具有平衡的机械性能，即具有较高的模量和硬度以及粘弹/粘塑性变形能力。冻干后，成熟牙釉质和处于成熟后期的牙釉质的蠕变显着增加，而处于过渡阶段且有机物含量较高的牙釉质的蠕变显着增加，但无统计学意义。热处理至600摄氏度会破坏大多数有机物，并导致搪瓷矿物中HAp微晶的晶体生长。结果，燃烧样品的模量和硬度显着增加，而粘性变形的能力受到损害。因此，在硬质矿物的纳米级建筑单元之间少量的软有机基质是应力转移以及粘性变形的重要因素之一。更重要的是，水似乎对于有机物履行其功能起着至关重要的作用，并且在抵抗外力的天然生物纳米复合材料的设计中至关重要。这项研究可以更深入地了解搪瓷的成分，结构和机械性能之间的关系。

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