High-strength nanograined and translucent hydroxyapatite monoliths via continuous hydrothermal synthesis and optimized spark plasma sintering
High-strength nanograined and translucent hydroxyapatite monoliths via continuous hydrothermal synthesis and optimized spark plasma sintering
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DOI：
10.1016/j.actbio.2010.09.029
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发表时间：
2011-02-01
影响因子：
9.7
通讯作者：
Darr, Jawwad A.
中科院分区：
文献类型：
--
作者：
Chaudhry, Aqif A.;Yan, Haixue;Darr, Jawwad A.
高强度、完全致密的纳米晶羟基磷灰石（生物陶瓷）整体的合成是一个挑战，因为通常需要高温或长烧结时间。在这项研究中，羟基磷灰石（HA）和缺钙HA（使用一种新的连续水热流合成方法制成）的纳米棒使用放电等离子体烧结（SPS）在高达1000摄氏度的温度下在5分钟内固结至全理论密度。在SPS加热和加载循环的显著优化之后，获得完全致密的HA盘，其是半透明的，表明非常高的密度。测量了这些材料的显著高的三点弯曲强度值（高达158 MPa）。冷冻破碎的磁盘，然后扫描电子显微镜调查显示，选定的样品具有亚200纳米大小的颗粒，没有可见的孔隙，这表明他们是完全致密的。(C)2010 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The synthesis of high-strength, completely dense nanograined hydroxyapatite (bioceramic) monoliths is a challenge as high temperatures or long sintering times are often required. In this study, nanorods of hydroxyapatite (HA) and calcium-deficient HA (made using a novel continuous hydrothermal flow synthesis method) were consolidated using spark plasma sintering (SPS) up to full theoretical density in similar to 5 min at temperatures up to 1000 degrees C. After significant optimization of the SPS heating and loading cycles, fully dense HA discs were obtained which were translucent, suggesting very high densities. Significantly high three-point flexural strength values for such materials (up to 158 MPa) were measured. Freeze-fracturing of disks followed by scanning electron microscopy investigation revealed selected samples possessed sub-200 nm sized grains and no visible pores, suggesting they were fully dense. (C) 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.