石墨烯对铁基金属结合剂金刚石磨具性能的影响

Effect of Graphene on Performance of Fe-Based Metal Binder Diamond Abrasive Tools

本文通过调整Fe-Co-Cu-Sn中石墨烯的含量来探究石墨烯对铁基金属结合剂金刚石磨具性能的影响。通过X射线衍射仪、扫描电子显微镜、万能力学试验机等测试了铁基金属结合剂金刚石磨具的显微结构、物相结构、力学性能和物理性能。结果表明:结合剂中石墨烯的含量仅对晶相含量有影响;当石墨烯含量为0.4%(质量分数)时,磨具的抗弯强度最高,为256.0 MPa,较无石墨烯磨具提高了17.4%;随着石墨烯含量增加,石墨烯由片状均匀分布转变为逐渐团聚,断口组织由脆性断裂转变为韧性断裂,磨具的热膨胀系数逐渐降低,导热系数逐渐提高;磨具的磨耗比呈先增加后减少的趋势,当石墨烯含量为0.4%时,磨耗比最高,为199.8,较不添加石墨烯的磨具提高了约21%。

The effect of graphene on the performance of Fe-based metal binder diamond abrasive tool was studied by adjusting the graphene content in Fe-Co-Cu-Sn.The microstructure,phase structure,mechanical properties and physical properties of Fe-based metal binder diamond abrasive tool were tested by X-ray diffractometer,scanning electron microscope and universal mechanical testing machine.The results show that the graphene content in binder only affects the content of crystalline phase.When the graphene content is 0.4%(mass fraction),the bending strength of abrasive tool is the highest,being 256.0 MPa,which is 17.4%higher than that of abrasive tool without graphene.With the increase of graphene content,graphene changes from flake like uniform distribution to gradual agglomeration,and the fracture structure changes from brittle fracture to ductile fracture.With the increase of graphene content,the thermal expansion coefficient of abrasive tool gradually decreases and the thermal conductivity gradually increases.The abrasive ratio of abrasive tool increases first and then decreases.When the graphene content is 0.4%,the abrasive ratio is the highest,being 199.8,which is about 21%higher than that of abrasive tool without graphene.