纳米镍粉对孕镶金刚石切削工具胎体性能的影响

摘要

The sintering temperature being lowered and matrix material being selected in the manufacturing process are the good way to reduce the effect of sintering temperature on the properties of diamond and improve matrix performance of cut-ting tools.Diamond impregnated matrix samples with an appropriate amount of nano-nickel powder were prepared by the vacuum hot-pressed.The hardness, strength, friction properties and microstructure were investigated in order to evaluate the feasibility of this method.The results show that for WC-based diamond impregnated matrix, HRC of the matrix contai-ning nano-nickel powder is increased by 11.9%, bending strength by 18.4% and abrasion ratio by 44.5% than those of the matrix without nano-nickel powder respectively;and for Fe-based diamond impregnated matrix, HRC of the matrix con-taining nano-nickel powder is increased by 19.5%, bending strength by0.2%, and abrasion ratio by 33.3%than those of the matrix without nano-nickel powder respectively.So adding nano-nickel powder to the matrix can both reduce the effect of sintering temperature on diamond and improve cutting performance.%为减小孕镶金刚石切削工具的烧结温度对单晶金刚石性能的影响和改善切削工具胎体性能，降低烧结温度和优选胎体配方材料是很好的解决方法。在切削工具的胎体中加入适量纳米镍粉，通过对制备试样的硬度、强度和耐磨性测试及微观特征分析，综合评价该方法的可行性。结果表明：对于WC基胎体，含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高11.9％，抗弯强度提高18.4％，耐磨性提高44.5％；对于Fe基胎体，含有纳米镍粉的胎体较不含纳米镍粉的胎体HRC提高19.5％，抗弯强度提高0.2％，耐磨性提高33.3％。既减小了温度对金刚石的影响，又提高了切削工具整体性能。