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Characterization and thermal behavior of calcium deficient hydroxyapatite whiskers with various Ca/P ratios

机译:不同钙/磷比的缺钙羟基磷灰石晶须的表征和热行为

摘要

Calcium deficient hydroxyapatite (Ca-def HA) whiskers with various Ca/P ratios were synthesized by a homogeneous hydrothermal precipitation method using acetamide. They had high crystallinity for Ca/P > 1.54, with a mean length of 79-113 μm and an aspect ratio of 85-103. No whisker entanglement and aggregation were found in the products. Thermal analyses revealed that the Ca/P ratio and crystallinity of the products showed significant effects on the crystalline phase, constitution and morphological stability of the whiskers at an elevated temperature. The whiskers with Ca/P > 1.54 were morphologically stable at temperatures below 1200 °C, with minor TCP appearance after heat-treatment at 800 °C; no further decomposition of the whiskers was found with increasing temperature. Such whiskers are possibly one promising reinforcing materials for preparing highly reliable apatite ceramics and composites either in dense or porous block materials with high mechanical properties and good enhanced biological performance.
机译:采用乙酰胺通过均相水热沉淀法合成了具有多种Ca / P比的缺钙羟基磷灰石(Ca-def HA)晶须。当Ca / P> 1.54时,它们具有高结晶度,平均长度为79-113μm,长径比为85-103。在产品中未发现晶须缠结和聚集。热分析表明,产物的Ca / P比和结晶度对晶须在高温下的晶相,组成和形态稳定性具有显着影响。 Ca / P> 1.54的晶须在低于1200°C的温度下在形态上稳定,在800°C的热处理后仅有少量TCP外观。随着温度升高,未发现晶须的进一步分解。这种晶须可能是一种有前途的增强材料,用于以高机械性能和良好的生物性能在致密或多孔块状材料中制备高度可靠的磷灰石陶瓷和复合材料。

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  • 作者

    Zhang H; Zhang M;

  • 作者单位
  • 年度 2011
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  • 原文格式 PDF
  • 正文语种 eng
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