Improving the resistance to sliding contact damage of zirconia using elastic gradients
Improving the resistance to sliding contact damage of zirconia using elastic gradients
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DOI：
10.1002/jbm.b.31657
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发表时间：
2010-08-01
影响因子：
3.4
通讯作者：
Zhang, Yu
中科院分区：
文献类型：
--
作者：
Kim, Jae-Won;Liu, Lela;Zhang, Yu
具有高强度的氧化锆基陶瓷已被确定为各种生物医学和工程应用中滑动部件的首选材料。尽管氧化锆假体具有较高的抗弯强度，但仍然容易受到磨损和表面损伤。我们假设，这种摩擦学损伤可以大大减轻在陶瓷表面的弹性模量的工程分级。在这项研究中，梯度结构制造渗透玻璃到氧化锆板的顶部和底部表面，从而减少外表面的模量。然后使用硬球形压头对板进行摩擦滑动试验。与未渗透的对照相比，渗透样本的断裂载荷显著增加，增加了3倍以上。滑动接触电阻的增加归因于梯度低模量表面处的拉应力减小。结果证实，适当分级的结构在下一代骨科和牙科假体的设计中非常有益。(C)2010 Wiley Periodicals，Inc. J Biomed Mater Res Part B：Appl Biomater 94 B：347- 352，2010.
Zirconia-based ceramics with high strength have been identified as a material of choice for sliding components in a variety of biomedical and engineering applications. Despite the high flexural strength, zirconia prostheses are still vulnerable to wear and surface damage. We hypothesize that such tribological damage may be substantially mitigated by an engineered grading of elastic modulus at the ceramic surface. In this study, graded structures were fabricated by infiltrating glass into the top and bottom surfaces of zirconia plates, with resulting diminished modulus in the outer surfaces. The plates were then subjected to frictional sliding tests using a hard spherical indenter. Com pared with noninfiltrated controls, infiltrated specimens showed a significant increase in the fracture loads, by over a factor of 3. The increase in the sliding contact resistance is attributed to the diminishing tensile stresses at the graded lower modulus surface. The results confirm that suitably graded structures can be highly beneficial in the design of next-generation orthopedic and dental prostheses. (C) 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 94B: 347-352,2010.