Microstructure and self-sharpening of the magnetite cap in chiton tooth

作者：Wang, C.; Li, Q. Y.; Wang, S. N.; Qu, S. X.; Wang, X. X.^*

来源：Materials Science & Engineering C-Materials for Biological Applications, 2014, 37: 1-8.

DOI：10.1016/j.msec.2013.12.029

• Tooth
• Biomineral
• Magnetite
• Chiton
• Self-sharpening

The magnetite cap of chiton tooth (Acanthochiton rubrolineatus) was studied with SEM. Three microstructurally distinct regions were recognized: Region I, close to the anterior surface of the cusp and composed of thick rod microstructure units; Region III, close to the posterior surface and composed of fine fibers; and Region II, sandwiched between Regions 1 and II and composed of thin sheets. The microstructure units in the three regions constitute a continuous and integrated architecture component. The hardness of Regions I and II was measured to be Hv270 and Hv490, respectively. Based on these microstructure observation and hardness data, the abrasive behavior and microstructural mechanism of self-sharpening of the chiton tooth were discussed in the paper. The self-sharpening was attributed to the combined effect of the hardness and the texture orientation of the microstructure units in Regions I and II.

• 出版日期2014-4-1
• 单位浙江大学