【摘要】 以碳纤维(carbon fiber,Cf)为增强相,采用微波法合成的含硅羟基磷灰石(carbon fiber reinforced silicon–substituted hydroxyapatite,Si–HA)为基体,用丙烯酸/衣康酸的缓冲液为凝固剂,制备了碳纤维增强含硅羟基磷灰石(Cf/Si–HA)骨水泥。研究了碳纤维体积含量、偶联剂种类和用量、柠檬酸钠的加入量对骨水泥抗折强度的影响,并采用正交实验法探讨了各因素的协同影响作用。采用X射线衍射、万能材料试验机、扫描电子显微镜和红外光谱对Cf/Si–HA骨水泥的抗折强度、显微结构和组分等进行了表征。结果表明:随碳纤维体积含量、硅烷偶联剂KH–550和柠檬酸钠含量的增加,骨水泥的抗折强度均呈现先增大后减小的趋势。当碳纤维体积含量为30%、硅烷偶联剂KH–550质量含量(下同)为0.8%、柠檬酸钠含量为25%时,骨水泥的抗折强度达到极大值43.8MPa。更多还原

【Abstract】 Carbon fiber reinforced silicon-substituted hydroxyapatite (Cf/Si–HA) bone cement composites were prepared by the microwave chemical reaction process using a buffer solution of acrylic acid and itaconic acid as gelling agent. The influences of volume fraction of carbon fibers, kinds and contents of coupling agents and sodium citrate content in the buffer solutions on the flexural strength of bone cements were particularly investigated. The flexural strength, microstructure and functional groups of the composites were characterized using an X-ray diffractometer, universal strength testing machine, scanning electron microscope and Fourier transform infrared spectrometer. The cooperative influences of the three factors on the properties of bone cements are discussed by an orthogonal experimental design. The results show that with the increase of the carbon fibers volume fraction, silane agent KH–550 content and sodium citrate content, the flexural strengths of Cf/Si–HA bone cement composites display a trend of increasing to a maximum first and then decreasing. The flexural strength of the prepared composite reaches the maximum value of 43.8 MPa when the carbon fiber volume fraction, silane agent KH–550 and sodium citrate mass contents are 30%, 0.8% and 25%, respectively.更多还原