Ductile and brittle material removal mechanisms in natural nacre—A model for novel implant materials
Ductile and brittle material removal mechanisms in natural nacre—A model for novel implant materials
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DOI：
10.1016/j.jmatprotec.2010.06.014
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发表时间：
2010-11
影响因子：
6.3
通讯作者：
B. Denkena;J. Koehler;Analía Moral
中科院分区：
文献类型：
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作者：
B. Denkena;J. Koehler;Analía Moral
珍珠是一种存在于海贝壳内层的复合材料。它由有机软质和无机硬质组成，排列成复杂的层次结构。由于这种排列方式，珠质具有优异的力学性能（弹性模量：64.70±3.50GPa，硬度：4.41±0.45GPa，密度：2.6g/cm3）。因此，珍珠质植入材料在许多领域都有很大的应用潜力。在医学上，这些材料可用于骨置换。本文提供了一个深入了解的材料去除机制发生在天然珠层的刮擦。划痕试验是对磨削过程的简化，用于研究单一输入参数对材料去除的影响。采用不同的刀具几何形状和不同的加工参数，通过分析加工力来评估材料的去除效率。此外，使用扫描电子显微镜（SEM）和光学轮廓仪图像以及显微照片检查划痕几何形状。这些试验的结果为真珠层的可加工性和新型真珠层材料的可加工性提供了知识。
Nacre is a composite material found in the inner layer of sea shells. It consists of soft organic and hard inorganic components arranged in a complex hierarchical structure. Due to this arrangement, nacre exhibits outstanding mechanical properties (elastic modulus: 64.70±3.50GPa, hardness: 4.41±0.45GPa, density: 2.6g/cm3). Therefore, nacreous implant materials have a high potential in many fields. In medical science, these materials might be used for bone replacement. This article provides an insight into the material removal mechanisms occurring in the scratching of natural nacre. Scratch tests are a simplification of the grinding process and are used to investigate the influence of single input parameters on the material removal. Different scratch tool geometries and varying processing parameters are applied, so that the material removal efficiency can be evaluated by analyzing the process forces. Additionally, the scratch geometry is examined by using a scanning electron microscope (SEM) and optical profilometer images as well as photomicrographs. The results of these examinations provide knowledge on the machinability of nacre and also on the machinability of new nacreous materials.