预合金粉含量对铁基胎体微观组织及性能的影响  

Influence of pre-alloyed powder content on microstructure and properties of iron-based matrix

作　　者：孙为云 康杰 丁紫阳 李连荣[1] 焦璨 刘胜新[2] SUN Weiyun;KANG Jie;DING Ziyang;LI Lianrong;JIAO Can;LIU Shengxin(Zhengzhou Technology College, Zhengzhou 450121, China;Zhengzhou University, Zhengzhou 450001, China)

机构地区：[1]郑州职业技术学院,郑州450121 [2]郑州大学,郑州450001

出　　处：《金刚石与磨料磨具工程》2020年第3期62-66,共5页Diamond & Abrasives Engineering

摘　　要：研究添加2%、6%、10%和14%质量分数的CuZnSn预合金粉,对金刚石陶瓷磨边轮铁基胎体热压烧结组织、物相组成及力学性能的影响。结果表明:不添加预合金粉烧结的铁基胎体主要包括灰白色、浅灰色和深灰色3种组织,存在的物相主要为γ-Fe、(Cu,Sn)和(γ-Fe,Ni)固溶体以及Fe4Cu3、Cu41Sn11、Ni4Sn等金属间化合物;加入预合金粉后,烧结工艺相同时,胎体中灰白色组织面积明显减少,浅灰色组织面积增加,深灰色组织面积变化不明显,除上述物相外,还出现了Cu0.61Zn0.39和CuZn2物相。随着CuZnSn预合金粉含量增加,铁基胎体的致密度、硬度、抗弯强度均呈先增大后减小的趋势,而磨损量则呈先减少后增加的趋势;在CuZnSn添加质量分数为6%时,分别达到最大值99.8%、104.4 HRB、947.2 MPa和最小值0.2725 g。添加适量CuZnSn预合金粉可以增加铁基胎体的液相量,改善粉体流动性,提高胎体性能,添加过量则会降低其综合性能。The effects of adding CuZnSn pre-alloyed powder,mass fractions of which were 2%,6%,10%and 14%,respectively,on some performances of the iron-based matrix of the diamond ceramic edging wheel were studied,namely the hot-pressed sintering structures,the phase compositions and the mechanical properties.The results show that the iron-based matrix without pre-alloyed powder mainly consists of three kinds of structures:gray-white,light gray and dark gray.The main phases areγ-Fe,(Cu,Sn),(γ-Fe,Ni)solid solution and Fe4Cu3、Cu41Sn11 and Ni4Sn intermetallic compounds.When the matrix with pre-alloyed powder added are sintered at the same conditions,the gray-white structure area decreases with increasing light gray structure area and stable dark gray structure area.In addition to the above phases,Cu0.61Zn0.39 and CuZn2 are also found.With the increase of CuZnSn pre-alloyed powder content,the density,the hardness and the bending strength of iron-based matrix increase first and then decrease,while the wear amount decreases first and then increases.When the mass fraction of CuZnSn pre-alloyed powder is 6%,the maximum values are 99.8%,104.4 HRB,947.2 MPa and the minimum value is 0.2725 g,respectively.Adding appropriate amount of CuZnSn pre-alloyed powder can increase the liquid content of the iron-based matrix,which improves the fluidity of the powder and then the properties of the matrix.However,excessive CuZnSn pre-alloy powder would reduce the comprehensive properties of the matrix.

关 键 词：CuZnSn预合金粉 铁基胎体 热压烧结 微观组织 

分 类 号：TG74[金属学及工艺—刀具与模具]