Slow crack growth behaviour of hydroxyapatite ceramics

被引:59
作者
Benaqqa, C
Chevalier, J
Saädaoui, M
Fantozzi, G
机构
[1] Inst Natl Sci Appl, CNRS, Dept Mat, UMR 5510,GEMPPM, F-69621 Villeurbanne, France
[2] Mohammadias Sch Engn, LERSIM, Simulat Instrumentat & Measures Dept, Rabat 10000, Morocco
关键词
ageing; crack growth; fracture toughness; hydroxyapatite; mechanical properties;
D O I
10.1016/j.biomaterials.2005.03.031
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Among materials for medical applications, hydroxyapatite is one of the best candidates in orthopedics, since it exhibits a composition similar to the mineral part of bone. Double torsion technique was here performed to investigate slow crack growth behaviour of dense hydroxyapatite materials. Crack rate, V, versus stress intensity factor, K-1, laws were obtained for different environments and processing conditions. Stress assisted corrosion by water molecules in oxide ceramics is generally responsible for slow crack growth. The different propagation stages obtained here could be analyzed in relation to this process. The presence of a threshold defining a safety range of use was also observed. Hydroxyapatite ceramics appear to be very sensitive to slow crack growth, crack propagation occurring even at very low K-1. This can be explained by the fact that they contain hydroxyl groups (HAP: Ca-10(PO4)(6)(OH)(2)), favouring water adsorption on the crack surface and thus a strong decrease, of surface energy in the presence of water. This study demonstrates that processing conditions must be carefully controlled, specially sintering temperature, which plays a key role on V-K-1 laws. Sintering at 50 degrees C above or below the optimal temperature, for example, may shift the V-K-1 law towards very low stress intensity factors. The influence of ageing is finally discussed. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:6106 / 6112
页数:7
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