中文摘要：

为了解石墨表面镀镍对金刚石钻头胎体性能的影响,采用热压烧结法制备了镀镍石墨/胎体复合材料,用扫描电镜观察石墨镀镍前后与胎体之间界面结合状态的变化,并研究了石墨表面镀镍对复合材料的抗弯强度、洛氏硬度以及在无冷却液的条件下与花岗岩对磨时的摩擦系数和磨损量的影响。结果表明：石墨表面镀镍之后,石墨与胎体之间的结合强度大幅度提高;提高了复合材料的整体性能,以及抗弯强度和硬度;增大了摩擦副的摩擦系数,且增大了胎体的磨损量。石墨表面镀镍提高了石墨/胎体复合材料的物理力学性能,但是降低了其干摩擦性能。

英文摘要：

To find out the influence of electroplating nickel on the graphite surface on the properties of diamond bit matrix,the Ni-coated graphite / matrix composite material is prepared by the hot-press method.Then,the change of the interface between the graphite and the matrix is observed by the scanning electron microscope before and after electroplating nickel on the graphite.And the influence of electroplating nickel on the graphite surface on the bending strength and Rockwell hardness of the composite materials are studied.Besides,the influence of electroplating nickel on the graphite surface on the friction coefficient and friction loss of the composite materials while rubbing against granite without coolant is studied.The results show that after electroplating nickel on the graphite,the bending strength between the graphite and the matrix is improved greatly,and the whole performance of the composite materials also improved.As a result,the bending strength and the Rockwell hardness of the composite materials are improved,but the friction coefficient of the friction pair and the friction loss of the composite materials are improved.These show that to electroplate nickel on graphite improves the physical and mechanical properties of the Ni-coated graphite/matrix composite material and decreases its dry friction and friction behavior.