摘要
在金刚石磨边轮Fe基胎体中分别添加0,0.7%,2.1%,3.5%,4.9%质量分数的Zn粉,研究Zn粉添加量对金刚石磨边轮Fe基胎体的热压烧结组织、物相组成及力学性能的影响;在此基础上,研究Fe基胎体中添加0、2.1%、3.5%质量分数的Zn粉以及浓度为24%的金刚石后制成的3种金刚石节块的性能及对应的3种磨边轮的磨削性能。结果表明:当采用相同烧结工艺时,不添加和添加Zn粉后的Fe基胎体中的白色、深灰色、灰色3种组织面积及存在形态明显变化,加入质量分数为2.1%的Zn粉有助于胎体中部分物质扩散,且其物相除γ-Fe、(Cu,Sn)和(γ-Fe,Ni)、Cu_(41)Sn_(11)固溶体以及Fe_(4)Cu_(3)、Ni_(4)Sn等金属间化合物外,还出现了Cu_(0.61)Zn_(0.39)新相。Zn粉质量分数增加,Fe基胎体的相对密度、硬度、耐磨性等皆呈下降趋势,但降幅不明显;而其抗弯强度相对未加Zn粉时的呈先增大后减小趋势,且在Zn粉添加质量分数为2.1%时提高了16.1%,达到最大值983.2 MPa;但添加的Zn粉质量分数过高,胎体热压时会出现流料现象。添加或未添加Zn粉的Fe基胎体中加入金刚石后,制作的节块与未加金刚石时的比,其抗弯强度下降,但添加Zn粉后的胎体抗弯强度降幅较小,把持力系数较大,可间接表明胎体对金刚石的把持力较高。用添加质量分数为2.1%的Zn粉的Fe基胎体制作的金刚石磨边轮磨削渗花陶瓷砖边时,与胎体中未添加Zn粉和添加质量分数为3.5%的Zn粉制作的磨边轮磨削效果比较,其锋利度适中,使用寿命最长。
The effects of adding Zn powder,different mass fractions of which were 0,0.7%,2.1%,3.5%and 4.9%,on the performances of the iron-based matrix of the diamond edging wheel were studied,namely the hot-pressed sintering structures,the phase compositions and the mechanical properties.On this basis,the properties of three kinds of diamond segments made by adding 0,2.1%,3.5%mass fraction of Zn powder and the diamond with a concentration of 24%in iron-based matrix,and the grinding performances of the corresponding three kinds of diamond edging wheels were studied.The results show that with the same sintering process,the area and the morphology of white,dark gray and gray structures in the iron-based matrix with and without Zn powder are obviously changed.The addition of Zn powder with mass fraction of 2.1%is helpful to the diffusion of some substances in the matrix,and the new phase Cu 0.61 Zn 0.39 appears in addition to the phases ofγ-Fe,(Cu,Sn),and(γ-Fe,Ni),Cu_(41)Sn_(11)solid solutions,as well as Fe_(4)Cu_(3)and Ni_(4)Sn intermetallic compounds.With the increase of Zn powder mass fraction,the relative density,the hardness and the wear of the iron-based matrix decrease,but the decline are not obvious.The bending strength of the iron-based matrix increases first and then decreases compared with that without Zn powder,and increases by 16.1%when the mass fraction of Zn powder is 2.1%,reaching the maximum value of 983.2 MPa.However,if the mass fraction of Zn powder is too high,the loss of material will appear when the matrix is hot pressed.After adding diamond to the iron-based matrix with or without Zn powder,the bending strengths of the fabricated segments decrease compared with that without diamond,but the decrease of the matrix with Zn powder are small and the holding force coefficients are larger,which indirectly indicate that the holding forces of the matrix to diamond are higher.When the diamond edging wheel made of iron-based matrix with 2.1%mass fraction of Zn powder is used to grind the edge of infiltrated ceramic brick,compared with the edging wheel made of no Zn powder and 3.5%mass fraction of Zn powder,its sharpness is moderate and its service life is the longest.
作者
孙为云
孙长红
康杰
于奇
丁紫阳
刘胜新
SUN Weiyun;SUN Changhong;KANG Jie;YU Qi;DING Ziyang;LIU Shengxin(Department of Materials Engineering,Zhengzhou Technical College,Zhengzhou 450121,China;State Key Laboratory of Advanced Brazing Filler Metals and Technology,Zhengzhou Research Institute of Mechanical Engineering,Zhengzhou 450001,China;School of Material Science&Engineering,Zhengzhou University,Zhengzhou 450001,China)
出处
《金刚石与磨料磨具工程》
CAS
北大核心
2021年第4期45-52,共8页
Diamond & Abrasives Engineering
基金
河南省重大创新示范专项(201110210600)。
关键词
Zn粉
Fe基胎体
热压烧结
金刚石节块
金刚石磨边轮
zinc powder
iron-based matrix
hot-pressed sintering
diamond segments
diamond edging wheel
