The biomedical co-continuous(β-TCP+MgO)/Zn-Mg composite was fabricated by infiltrating Zn-Mg alloy into porousβ-TCP+MgO using suction exsorption technique.The microstructure,mechanical properties and corrosion behav...The biomedical co-continuous(β-TCP+MgO)/Zn-Mg composite was fabricated by infiltrating Zn-Mg alloy into porousβ-TCP+MgO using suction exsorption technique.The microstructure,mechanical properties and corrosion behaviors of the composite were evaluated by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),mechanical testing,electrochemical and immersion test.It was found that the molten Zn-Mg alloy had infiltrated not only into the pores but also into the struts of the porousβ-TCP+MgO scaffold to form a compact composite.The Zn-Mg alloy contacted to theβ-TCP+MgO scaffold closely,and no reaction layer can be found between the alloy and the scaffold.The compressive strength of the composite was as high as244MPa,which was about1000times higher than that of the original porousβ-TCP+MgO scaffold and2/3of the strength of the Zn-Mg bulk alloy.The electrochemical and immersion tests in simulated body fluid(SBF)solution indicated that the corrosion resistance of the composite was better than that of the Zn-Mg bulk alloy.The corrosion products on the composite surface were mainly Zn(OH)2.Appropriate mechanical and corrosion properties indicated that the(β-TCP+MgO)/Zn?Mg composite fabricated by suction exsorption would be a very promising candidate for bone substitute.展开更多
Carbon fiber reinforced aluminum matrix （Cf/Al） composite has many excellent properties, and it has received more and more attention. Two-dimensional （2D） Cf/Al composites were fabricated by vacuum and pressure in...Carbon fiber reinforced aluminum matrix （Cf/Al） composite has many excellent properties, and it has received more and more attention. Two-dimensional （2D） Cf/Al composites were fabricated by vacuum and pressure infiltration, which was an integrated technique and could provide high vacuum and high infiltration pressure. The effect of specific pressure on the infiltration quality of the obtained composites was comparatively evaluated through microstructure observation. The experimental results show that satisfied Cf/Al composites could be fabricated at the specific pressure of 75 MPa. In this case, the preform was infiltrated much more completely by aluminum alloy liquid, and the residual porosity was seldom found. It is found that the ultimate tensile strength of the obtained Cf/Al composite reached maximum at the specific pressure of 75 MPa, which was improved by 138.9% compared with that of matrix alloy.展开更多
采用真空吸渗挤压工艺制备了二维碳纤维增强铝基（2D-Cf/Al）复合材料。在挤压力（比压）为60-90 MPa、真空度为10-30 k Pa、浸渗挤压温度为580-620℃、保压时间为60-120 s时,可以获得浸渗充分和成形质量良好的复合材料。微观组织观察...采用真空吸渗挤压工艺制备了二维碳纤维增强铝基（2D-Cf/Al）复合材料。在挤压力（比压）为60-90 MPa、真空度为10-30 k Pa、浸渗挤压温度为580-620℃、保压时间为60-120 s时,可以获得浸渗充分和成形质量良好的复合材料。微观组织观察分析表明,基体合金和碳纤维分布均匀,纤维无折断、漂移现象,无明显微观缺陷。对Cf/Al复合材料进行密度和拉伸性能测试,其密度比基体合金降低17.9%,抗拉强度提高100%。热处理实验表明,经过T6热处理,基体合金的组织得到改善,内部应力和缺陷得到有效控制和消除,抗拉强度提高41%,而碳纤维和基体合金热膨胀系数的差异会在复合材料内部产生不良应力,导致其拉伸性能没有提高反而下降16%。展开更多
基金Project (51101039) supported by the National Natural Science Foundation of ChinaProject (E201005) supported by the Natural Science Foundation of Heilongjiang Province,China
文摘The biomedical co-continuous(β-TCP+MgO)/Zn-Mg composite was fabricated by infiltrating Zn-Mg alloy into porousβ-TCP+MgO using suction exsorption technique.The microstructure,mechanical properties and corrosion behaviors of the composite were evaluated by means of scanning electron microscopy(SEM),X-ray diffraction(XRD),mechanical testing,electrochemical and immersion test.It was found that the molten Zn-Mg alloy had infiltrated not only into the pores but also into the struts of the porousβ-TCP+MgO scaffold to form a compact composite.The Zn-Mg alloy contacted to theβ-TCP+MgO scaffold closely,and no reaction layer can be found between the alloy and the scaffold.The compressive strength of the composite was as high as244MPa,which was about1000times higher than that of the original porousβ-TCP+MgO scaffold and2/3of the strength of the Zn-Mg bulk alloy.The electrochemical and immersion tests in simulated body fluid(SBF)solution indicated that the corrosion resistance of the composite was better than that of the Zn-Mg bulk alloy.The corrosion products on the composite surface were mainly Zn(OH)2.Appropriate mechanical and corrosion properties indicated that the(β-TCP+MgO)/Zn?Mg composite fabricated by suction exsorption would be a very promising candidate for bone substitute.
基金Projects(51221001,51275417)supported by the National Natural Science Foundation of ChinaProject(SKLSP201103)supported by the Fund of the State Key Laboratory of Solidification ProcessingProject(B08040)supported by the Introducing Talents of Discipline toUniversities,China
文摘Carbon fiber reinforced aluminum matrix （Cf/Al） composite has many excellent properties, and it has received more and more attention. Two-dimensional （2D） Cf/Al composites were fabricated by vacuum and pressure infiltration, which was an integrated technique and could provide high vacuum and high infiltration pressure. The effect of specific pressure on the infiltration quality of the obtained composites was comparatively evaluated through microstructure observation. The experimental results show that satisfied Cf/Al composites could be fabricated at the specific pressure of 75 MPa. In this case, the preform was infiltrated much more completely by aluminum alloy liquid, and the residual porosity was seldom found. It is found that the ultimate tensile strength of the obtained Cf/Al composite reached maximum at the specific pressure of 75 MPa, which was improved by 138.9% compared with that of matrix alloy.
文摘采用真空吸渗挤压工艺制备了二维碳纤维增强铝基（2D-Cf/Al）复合材料。在挤压力（比压）为60-90 MPa、真空度为10-30 k Pa、浸渗挤压温度为580-620℃、保压时间为60-120 s时,可以获得浸渗充分和成形质量良好的复合材料。微观组织观察分析表明,基体合金和碳纤维分布均匀,纤维无折断、漂移现象,无明显微观缺陷。对Cf/Al复合材料进行密度和拉伸性能测试,其密度比基体合金降低17.9%,抗拉强度提高100%。热处理实验表明,经过T6热处理,基体合金的组织得到改善,内部应力和缺陷得到有效控制和消除,抗拉强度提高41%,而碳纤维和基体合金热膨胀系数的差异会在复合材料内部产生不良应力,导致其拉伸性能没有提高反而下降16%。
基金National High-Tech Research and Development Program of China(2013AA8011004B)Foundation for Innovative Research Groups of the National Natural Science Foundation of China(CX201227)State Key Laboratory of Solidification Processing in NWPU(SKLSP201103)
