金刚石工具用适配型CuSnZnNi预合金粉末的研制  

Development of suitable CuSnZnNi pre-alloyed powder for diamond tools

作　　者：于奇 马佳 龙伟民 钟素娟 于新泉 潘建军 YU Qi;MA Jia;LONG Weimin;ZHONG Sujuan;YU Xinquan;PAN Jianjun(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：《金刚石与磨料磨具工程》2021年第2期23-27,共5页Diamond & Abrasives Engineering

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

摘　　要：在CuSn合金中添加Zn、Ni元素研制一种CuSnZnNi适配型预合金粉,克服了CuSn10合金硬度低,对金刚石把持力弱,通用性欠佳等问题。通过添加质量分数为20%的Zn元素研制了CuSnZn合金,相对CuSn10合金固液相温差由170℃降为34℃,合金的流动性得到显著提升。电子显微镜分析表明:随着Zn元素加入,(α+δ)-CuSn共析组织显著增加,同时烧结体中的α-(Cu,Sn)相逐渐转变为α-(Cu,Zn)相;XRD分析表明合金中生成了Cu6Sn5、Cu41Sn11、Cu5.6Sn的δ相和Cu5Zn8的γ相。在合金中继续添加Ni元素可细化合金晶粒,提高烧结体致密度,强化相组织,阻止裂纹扩展,且合金中出现α-(Cu,Ni)固溶体和金属间化合物Ni3Sn。研制的预合金粉末可提高金刚石工具烧结性能,具有优良的适配性。Based on the composition of CuSn alloy,Zn and Ni elements were added to develop CuSnZnNi pre-alloyed powder,which would overcome the problems of low hardness,weak holding power of diamond and poor universality of CuSn10.CuSnZn alloy was prepared by adding 20%zinc element.Compared with CuSn10 alloy,the temperature difference between solid and liquid phase decreased from 170℃to 34℃,and the fluidity of the alloy was significantly improved.The microstructure of CuSn eutectoid phase(α+δ)increased significantly with the addition of Zn element.Meanwhile,α-(Cu,Sn)phase gradually transformed intoα-(Cu,Zn)phase in the sintered matrix.XRD analysis showed thatδphase of Cu6Sn5,Cu41Sn11,Cu5.6Sn andγphase of Cu5Zn8 were formed in the alloy.The results show that the grain size of the alloy could be refined and the density of sintered body improved by adding nickel element continuously.At the same time,Ni could strengthen the phase structure and prevent the crack growth.Solid solution ofα-(Cu,Ni)and intermetallic compound Ni3Sn appeared in the alloy.The results show that the pre-alloyed powder could improve the sintering performance of diamond tools,which have excellent adaptability.

关 键 词：金刚石工具 预合金粉末 胎体性能 组织转变 

分 类 号：TG74[金属学及工艺—刀具与模具] TF124[冶金工程—粉末冶金]