金刚石与磨料磨具工程2026，Vol.46Issue(4)：461-469,9.DOI:10.13394/j.cnki.jgszz.2025.0062
扫描速度对电子束选区熔化制备Ni-Cu/金刚石复合材料微观组织及性能的影响
Effect of scanning speed on microstructure and properties of Ni-Cu/diamond composites prepared by electron beam selective melting
摘要
Abstract
Objectives:With the development of geological drilling towards the deep Earth and deep sea,the requirements for the matrix material of drill bits are becoming increasingly stringent.Traditional polycrystalline diamond compact(PDC)drill bit bodies are mainly prepared by sintering a hard phase and a binder phase.The current problem is that it is difficult to resist the strong impact brought by a large number of solid particles of rock chips and high pumping pressure in deep drilling.The drill bit body will be damaged prematurely due to excessive wear,causing the PDC drill teeth to prematurely fall off or break,which greatly reduces the service life of the drill bit.In addition,the traditional PDC drill bit bodies are mainly made by machining or high-temperature sintering using a mold,which has the disadvantages of a long preparation cycle,low efficiency and poor control of drill bit precision.Methods:In this paper,Ni-Cu alloy powder and diamond powder are used as raw materials to prepare Ni-Cu/diamond composites for a PDC drill bit matrix by electron beam selective melting(EBSM).Through microscopic characterization and mechanical property testing,the effect of scanning speed on the density,bending strength and wear resistance of the Ni-Cu/diamond composite is systematically investigated.Results:The results show that with the gradual increase of the scanning speed,the density,bending strength,and wear ratio of Ni-Cu/diamond composite samples after printing show a trend of first increasing and then gradually decreasing.When the scanning speed is 4.50 m·s-1,the scanning speed is low,and the heat input on the surface of the mixed raw materials is too large,which leads to the formation of defects and pores,so the performance of the Ni-Cu/diamond composite sample under this condition is poor.When the scanning speed is 4.75 m·s-1,the density,flexural strength and wear ratio reach the maximum values of 94.4%,142.2 MPa and 0.63,respectively,and the wear resistance of the sample reaches the optimal value.When the scanning speed is further increased to 5.50 m·s-1,part of the metal powder on the specimen surface is not sufficiently melted due to the excessive scanning speed,resulting in cracks and bonding defects appearing inside the specimen,so the specimen's performance shows a decreasing trend.Conclusions:Therefore,it can be concluded that the prepared Ni-Cu/diamond composites exhibit optimal bending strength and wear resistance when the electron beam scanning speed is 4.75 m·s-1.关键词
电子束选区熔化(EBSM)/Ni-Cu/金刚石复合材料/抗弯强度/磨耗比Key words
electron beam selective melting(EBSM)/Ni-Cu/diamond composites/bending strength/wear ratio分类
化学化工引用本文复制引用
李浩东,刘麦子,王一帆,范永刚,王聪..扫描速度对电子束选区熔化制备Ni-Cu/金刚石复合材料微观组织及性能的影响[J].金刚石与磨料磨具工程,2026,46(4):461-469,9.基金项目
国家重点研发计划(2021YFB3701800) （2021YFB3701800）
国家自然科学基金(52104360,52374367). （52104360,52374367）
