磷酸盐生物水泥劈裂强度和硬度改善的初步研究

PRELIMINARY STUDY ON THE IMPROVEMENT OF THE SPLITTING STRENGTH AND HARDNESS OF PHOSPHATE BIO-CEMENT

以活性羟基磷灰石 (HAP ,Ca5(PO4) 3 OH)和磷酸盐生物水泥 (PBC)为基础 ,研究了碳纤维和原蚕丝纤维以及养护条件对水化试样的劈裂强度和表面硬度的改善 .实验结果表明 ,生物纤维和适宜的养护条件使水化试体的劈裂强度有一定的提高 ,Vickers硬度有较大的提高 ;用扫描电子显微镜 (SEM )和红外光谱 (IR)初步研究了纤维与水化产物之间的界面结构 ,发现纤维与生物水泥水化产物界面可能有不同程度的化学结合 .

The poorly crystallized hydroxyapatite (HAP, Ca 5(PO 4) 3OH) was prepared by sol-gel method under low temperature. Natural fibers with high elasticity module and high tensile strength and good biocompatibility and bioactivity such as silk and carbon fiber were chosen to reinforce the bio_cements, HAP and phosphate bio_cement (PBC), without losing its biocompatibility and bioactivity. The results show that with the bio_fiber and proper curing (in saturated solution of KH 2PO 4) the splitting strength of the specimens reinforced is increased to some extent and the surface hardness improves significantly. SEM and IR studies suggest that some chemical bonding may be formed at the interfaces.