Department of Technological Sciences and Development, Campus de Ponta Delgada, Azores University, 9501-801, Ponta Delgada, Açores, Portugal ; Physics Department of FCT/UNL, CEFITEC-Centre of Physics and Technological Research, Quinta da Torre, 2829-516, Caparica, Portugal.
Department of Technological Sciences and Development, Campus de Ponta Delgada, Azores University, 9501-801, Ponta Delgada, Açores, Portugal ; CIRN-Centre of Research in Natural Resources, 9501-801, Ponta Delgada, Açores, Portugal.
Nanoscale Res Lett. 2010 Aug 31;6(1):20. doi: 10.1007/s11671-010-9766-z. eCollection 2011.
In this study, we tailor the microstructure of hydroxyapatite/zirconia nanocrystalline composites by optimizing processing parameters, namely, introducing an atmosphere of water vapor during sintering in order to control the thermal stability of hydroxyapatite, and a modified sol-gel process that yields to an excellent intergranular distribution of zirconia phase dispersed intergranularly within the hydroxyapatite matrix. In terms of mechanical behavior, SEM images of fissure deflection and the presence of monoclinic ZrO2 content on cracked surface indicate that both toughening mechanisms, stress-induced tetragonal to monoclinic phase transformation and deflection, are active for toughness enhancement.
在这项研究中，我们通过优化加工参数来调整羟基磷灰石/氧化锆纳米晶复合材料的微观结构，即在烧结过程中引入水蒸气气氛以控制羟基磷灰石的热稳定性，以及采用改进的溶胶-凝胶工艺，使氧化锆相在羟基磷灰石基体中呈弥散分布。从力学性能方面来看，SEM 图像中裂纹的偏转和裂纹表面出现的单斜 ZrO2 含量表明，两种增韧机制，即应力诱导四方相向单斜相的转变和偏转，都对提高韧性有效。
