Toughening mechanisms in iron-containing hydroxyapatite/titanium composites
Toughening mechanisms in iron-containing hydroxyapatite/titanium composites
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DOI：
10.1016/j.biomaterials.2009.11.046
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发表时间：
2010-03-01
期刊：
影响因子：
14
通讯作者：
Zhang, C. P.
中科院分区：
文献类型：
--
作者：
Chang, Q.;Chen, D. L.;Zhang, C. P.
纯羟基磷灰石（HA）是脆性的，它不能直接用于承重生物医学应用。本研究的目的是开发一种新的含铁HA/钛复合材料，通过无压烧结在相对较低的温度，特别强调识别潜在的增韧机制。Fe的加入使HA/Ti复合材料形成了独特的Ti/Fe核壳结构，外层为Ti，内层为Fe，与HA基体结合良好。随着Ti-Fe颗粒添加量的增加，复合材料的相对密度、硬度和弹性模量降低，而抗弯强度、断裂韧性、疲劳抗力和相关的断口粗糙度显著增加。在复合材料中观察到不同的增韧机制，包括裂纹桥接，分支和偏转，从而有效地提高裂纹扩展阻力，导致复合材料的力学性能的显着改善。(C)2009爱思唯尔有限公司保留所有权利。
Pure hydroxyapatite (HA) is brittle and it cannot be directly used for the load-bearing biomedical applications. The purpose of this investigation was to develop a new iron-containing HA/titanium composite via pressureless sintering at a relatively low temperature with particular emphasis on identifying the underlying toughening mechanisms. The addition of iron to HA/titanium composites led to a unique and favorable core/shell microstructure of Ti-Fe particles that consisted of outer titanium and inner iron, and good interfacial bonding with HA matrix. While the relative density, hardness and Young's modulus reduced, the flexural strength, fracture toughness, fatigue resistance, and the related fracture surface roughness increased significantly with increasing amount of Ti-Fe particles. Different toughening mechanisms including crack bridging, branching and deflection were observed in the composites, thus effectively increasing the crack propagation resistance and resulting in a substantial improvement in the mechanical properties of the composites. (C) 2009 Elsevier Ltd. All rights reserved.