硅黄铜预合金粉末在金刚石工具中的应用  

Application of silicon brass pre-alloyed powder in diamond tools

作　　者：于奇 马佳 龙伟民 钟素娟 潘建军 于新泉 YU Qi;MA Jia;LONG Wei-min;ZHONG Su-juan;PAN Jian-jun;YU Xin-quan(State Key laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州机械研究所有限公司新型钎焊材料与技术国家重点实验室,郑州450001

出　　处：《粉末冶金技术》2020年第3期206-210,233,共6页Powder Metallurgy Technology

基　　金：郑州市重大科技创新专项资助项目(2019CXZX0065);中原科技创新领军人才资助项目(ZYQR20180030)。

摘　　要：采用气水耦合雾化法制备了含有质量分数0.4%稀土Ce的硅黄铜预合金粉末,在680~720℃热压烧结预合金粉末,获得了致密烧结体。通过洛氏硬度计测试烧结体硬度为HRB 62~65,使用万能力学实验机测试烧结体抗弯强度为530~550 MPa,利用扫描电子显微镜观察烧结体基体微观组织为α相黄铜,组织中还存在蠕虫状及花状的弥散银灰色(β′+γ)相。选择添加质量分数20%的硅黄铜预合金粉末配方(铁粉+铜粉+锌粉+预合金粉末)制备花岗岩切割用金刚石刀头,与单质粉末混合配方(铁粉+铜粉+锌粉)制备的刀头相比,添加硅黄铜预合金粉末的刀头硬度增加22%,抗弯强度降低8%,刀头锋利度和使用寿命整体提升,胎体磨粒夹杂减少,并出现大量排屑沟槽。The silicon brass pre-alloyed powder with 0.4%Ce by mass was prepared by gas-water coupling atomization method.The dense sintered body were obtained by hot pressing sintering at 680~720℃.The hardness of the sintered body is HRB 62~65 tested by Rockwell hardness tester,and the bending strength is 530~550 MPa tested by the universal testing machine.The microstructure of the sintered body is consisted of the brass phase(a phase)and the vermicular and flower-like dispersed silver gray(β’+g)phases observed by scanning electron microscope.The diamond cutting segment for granites were prepared by the mixed powders of iron powder+copper powder+zinc powder+20%silicon brass pre-alloyed powder by mass.Compared with the cutting segment prepared by the elemental powders(iron powder+copper powder+zinc powder),the hardness of the cutting segment prepared by the mixed powders with silicon brass pre-alloyed powder increases by 22%and the bending strength decreases by 8%.The sharpness and service life of the cutting segment with silicon brass pre-alloyed powder were improved,and the matrix was characterized by the reduction of abrasive inclusions and a large number of chip removal grooves.

关 键 词：预合金粉末 烧结 金刚石工具 锋利度 使用寿命 

分 类 号：TG749[金属学及工艺—刀具与模具]