黏结剂对铁基混合粉末性能的影响  

Effect of binder on properties of iron based mixed powder

作　　者：苏凤戈 郑卓 陈陆水 SU Fengge;ZHENG Zhuo;CHEN Lushui(Jiande Welfine Technology Co.,Ltd.,Hangzhou 311613,China;Hangzhou Yitong New Materials Co.,Ltd.,Hangzhou 311613,China)

机构地区：[1]建德维佳科技有限公司,杭州311613 [2]杭州屹通新材料股份有限公司,杭州311613

出　　处：《粉末冶金材料科学与工程》2020年第5期396-402,共7页Materials Science and Engineering of Powder Metallurgy

摘　　要：利用自制的黏结剂,采用黏结工艺制备Fe-C、Fe-Cr-C和Fe-Ni-Cu-C等几种铁基混合粉末。用扫描电镜(SEM)观察Fe-Ni-Cu-C混合粉末的形貌与结构,研究黏结剂含量w(黏结剂)对Fe-C混合粉的流动性、松装密度、压缩性能与压坯横向断裂强度等的影响。结果表明,采用黏结混合法制备的Fe-Ni-Cu-C混合粉末,小颗粒大都黏结在大颗粒铁粉表面,可降低粉末成分的偏析。与未添加黏结剂的Fe-C混合粉末相比,w(黏结剂)为0.02%和0.03%时,Fe-C混合粉末的流动性降低,所需压制压力增大,但最大增幅小于6%。未添加黏结剂的Fe-C混合粉生坯强度为12.5 MPa,w(黏结剂)为0.03%的Fe-C生坯强度为13.7 MPa,固化后达到45.8 MPa。利用该工艺制备的Fe-Cr-C双排链轮压坯具有良好的机加工性能,在断续切削时,可保持链轮齿形和加工边缘的完好性。Fe-C,Fe-Cr-C,Fe-Ni-Cu-C and other iron-based mixed powders were prepared by bonder-treated process method using self-made binder.Scanning electron microscopy(SEM)was used to observe the morphology and structure of the Fe-Ni-Cu-C mixed powder.The effects of binder content(mass fraction)on the flowability,apparent density,compressibility of Fe-C mixed powder,and on the transverse rupture strength(TRS)of Fe-C greens were studied.The results show that in the Fe-Ni-Cu-C mixed powder prepared by bonder mixing method,most of the small particles are bonded to the surface of the large iron powder,which reduces the segregation of the powder composition.Compared with the Fe-C powder without binder,the flowability of Fe-C mixed powders with 0.02%and 0.03%binder increases,and the required more pressing pressure.But the maximum increase is less than 6%,which is acceptable in actual production.The TRS of Fe-C green without binder is 12.5 MPa,and that with 0.03%binder is 13.7 MPa,and 45.8 MPa after curing.The Fe-Cr-C double row sprocket blank prepared by this process has good machinability,and can keep the integrity of sprocket tooth profile and machining edge under intermittent cutting condition.

关 键 词：水雾化铁粉 黏结剂 粉末形貌 生坯加工 混合粉 

分 类 号：TF123.2[冶金工程—粉末冶金]