Toughening characterization in alumina platelet-hydroxyapatite matrix composites

被引:27
作者
Gautier, S [1 ]
Champion, E [1 ]
Bernache-Assollant, D [1 ]
机构
[1] CNRS, Lab Mat Ceram & Traitements Surface, F-87060 Limoges, France
关键词
D O I
10.1023/A:1008964230258
中图分类号
R318 [生物医学工程];
学科分类号
0831 [生物医学工程];
摘要
Fracture toughness of Al2O3 platelet-reinforced hydroxyapatite (HAP) ceramics was investigated using the Vickers' indentation technique. The geometrical anisotropy of alumina platelets induces an anisotropic toughening. The efficiency of reinforcing mechanisms remains maximum for a crack propagating with an angular deviation inferior to 30 degrees around the direction perpendicular to alumina disc faces. This is assumed to result from a crack deflection mechanism which induces a favorable contribution of mode II failure. A small effect of hydroxyapatite grain size becomes noticeable in the direction parallel to alumina disc faces. The toughening depends on the size and volume content of alumina platelets. Large size platelets provoke a spontaneous microcracking of the HAP matrix which is detrimental to the mechanical reliability, whereas small platelets lead to a strong toughening. The results relate to the intensity of thermoelastic residual stresses within the matrix around alumina inclusions. (C) 1999 Kluwer Academic Publishers.
引用
收藏
页码:533 / 540
页数:8
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