摘要
研究了碳纤维对羟基磷灰石-磷铝酸盐-磷镁酸盐(HAP-PAC-MPC)复合生物水泥的增强、增韧作用,采用XRD、SEM和IR等测试方法分析和探讨了其作用机理。结果表明:(1)碳纤维对于复合生物水泥的增强效果明显,未经处理的碳纤维使复合生物水泥的劈裂强度提高13%,维氏硬度提高63%,而用碳纤维处理后分别提高了51%和近130%,碳纤维的最佳掺量为0.076%;(2)由于碳纤维处理后其表面含有的氧官能团—羟基和羧基的浓度显著提高,加强了它与水泥水化产物在界面处的结合力,形成了化学结合,从而使水泥基料水化、水化产物形成及结晶过程中产生的应力可以通过纤维与基料间的界面而被吸收;(3)碳纤维可以有效地阻止在外力作用下试件内裂纹的扩展或使其转向,从而导致复合材料增强、增韧。
Effect of carbon fiber on the mechanical properties of micro - hardness and splitting tensile strength of HAP - PAC - MPC - based composite biocement were studied. The reinforcing mechanism of carbon fiber was analyzed by XRD, SEM, IR, and dispemion energy spectra. The results indicate that： （ 1 ） carbon fiber is obviously effective in reinforcing the mechanical properties of the composite biocement, especially that treated by concentrated inorganic acid. The splitting tensile strength and vickers hardness of HAP - PAC - MPC - based composite biocement with treated carbon fiber increased from 12.22 MPa to 18.47 MPa, by 51% ; and from 156.64 MPa to 358.92 MPa, by 130% respectively. The optimum addition of carbon fiber treated is 0. 076%. （2） The concentration of functional groups of [ - OH] and[ - COOH] in the surface of carbon fiber treated by acid increases obviously, which strengthens the chemical bond force of the interface between carbon fiber and hydrated products of cement base. （3） The stress induced in the process of hydrating and formation of hydrates can be absorbed by the interfaces; meanwhile, the propagation of the cracks within the body of pasts upon the loading of external stress can be prevented or be turned effectively by the carbon fiber which results in the strengthening and toughening of HAP- PAC - MPC - based composite biocement.
出处
《生物医学工程研究》
2005年第2期90-94,共5页
Journal Of Biomedical Engineering Research
基金
山东省自然科学基金资助项目(Y2002F07
Q2003.F02)
