热压制备硅酸铝纤维/TCP生物FGM的微观结构与性能

Microstructure and performance of alumina silicate fibres/TCP biological FGM fabricated by hot pressing technique

采用热压工艺制备了硅酸铝纤维/TCP生物功能梯度材料(FGM)。采用X射线衍射分析、扫描电镜、EDAX线扫描能谱分析、密度分析及洛氏硬度分析对FGM进行了研究,结果表明:纤维含量分布呈轴向对称梯度变化。FGM整体完好,无破损或裂纹出现。FGM在宏观上呈现较模糊的梯度分布,微观上则表现出成分的连续变化。TCP基体与纤维结合紧密。FGM中TCP与硅酸铝纤维及热压模之间均未发生化学反应生成杂质化合物,HA至TCP的相变是因为羟基磷灰石的分解产生。随纤维含量增加,FGM各梯度层的断裂形式由脆性断裂逐渐转变为韧性断裂,且韧性程度随纤维含量增加而增强。各梯度层硬度和相对密度随纤维含量的增加而提高,且在纤维含量为60 vol%时达到最高,分别为92.7 MPa和86.5%。

Alumina silicate fibres/TCP biological functionally gradient material（FGM） was fabricated by hot pressing technique.X-ray diffraction analysis,SEM,EDAX linear scanning analysis,density and hardness test were adopted to carry out the research of the FGM.The results show that fibre contents distribution changes symmetrically in the FGM.No flaws and breakages appear in the FGM.FGM presents indistinct gradient distribution in macrostructure and continuous component changes in microstructure.TCP matrix combines with silicate fibres tightly in the FGM.Decomposition of hydroxyapatite leads to phase transformation from HA to TCP and no chemical reaction happens among TCP and fibre and the hot pressing die.With the increase of fibre contents,the fracture way changes from brittle fracture to toughness fracture and the toughness degree increases.The hardness and relative density are enhanced with the increase of fibre contents.60 vol% fibres gradient layer behaves the highest value with hardness and relative density equal to 92.7 MPa and 86.5%,respectively.