HA/FeCrAl纤维生物功能梯度材料的制备及其性能

摘要

HA/FeCrAl fiber FGM was fabricated with hot pressing technique. SEM, EDAX and XRD were carried out to characterize its performance and microstructure. The results show that there are gradient changes in the FGM with FeCrAl fiber contents changing as 2.5%-5.0%-7.5%-10.0%-15.0%-20.0% and there is indistinct transition between gradient layers. Both HA and FeCrAl are evenly distributed in the gradient layers and interface fusion of the two phases is excellent. No obvious pores or cracks appear in the FGM. After pretreatment of diluted hydrochloric acid, the depression in fiber surface let fiber and matrix integrate better. Comprehensive bending strength of FGM is 78.89 Mpa. There exist FeCrAl fiber pull-out toughening mechanism and crack deflection toughening mechanism between layers in the FGM. Since only two phase structures with HA and FeCrAl are found in the FGM, no chemical reaction among HA and FeCrAl and hot pressing could takes place.%采用热压技术制备HA/FeCrAl纤维功能梯度材料(FGM)，并借助SEM，EDAX和XRD等对HA/FeCrAl纤维FGM的性能和微观结构进行测试及观察。研究结果表明：HA/FeCrAl纤维FGM按FeCrAl纤维体积含量呈2.5％-5.0％-7.5％-10.0％-15.0％-20.0％梯度变化，梯度层之间模糊过渡。梯度层内纤维分布均匀,无明显的孔洞或裂纹等缺陷存在，两相界面融合良好。经稀盐酸预处理后，纤维表面产生的凹陷有利于纤维与基体紧密结合。HA/FeCrAl纤维FGM整体抗弯强度为78.89 MPa，体现出较明显的纤维拔出增强机制及层间裂纹偏转增韧机制。HA/FeCrAl纤维FGM的物相为HA和FeCrAl，无其他杂质相出现，无任何两相间及与热压模具间的反应发生。