水气联合雾化制备超细铁粉及其在激光焊锯片上的应用  

Preparation of ultra-fine iron powders by water-gas atomization and its application on laser welding saw blades

作　　者：李鑫 李世进 乐晨 樊子民[1] 蔡佳宁 LI Xin;LI Shijin;LE Chen;FAN Zimin;CAI Jianing(College of Materials Science and Engineering,University of Science and Technology Xi′an,Xi′an 710000,China;ZHONGZHI Advanced Material Technology Co.,Ltd.,Quanzhou 362000,Fujian,China;TIZ Advanced Alloy Technology Co.,Ltd.,Quanzhou 362000,Fujian,China)

机构地区：[1]西安科技大学材料科学与工程学院,西安710000 [2]泉州众志新材料科技有限公司,福建泉州362000 [3]泉州天智合金材料科技有限公司,福建泉州362000

出　　处：《金刚石与磨料磨具工程》2023年第3期305-312,共8页Diamond & Abrasives Engineering

摘　　要：用水气联合雾化工艺制备超细铁粉,对比超细铁粉、还原铁粉和羰基铁粉的物性和微观形貌,并在一定的热压工艺下制备3种铁粉的烧结块,考察其断口形貌和力学性能;同时,在一定焊接条件下将3种铁粉应用于激光焊锯片的过渡层,考察其焊接性能。结果表明:水气联合雾化工艺制备的超细铁粉颗粒较细、氧含量低、纯度和球形度高、烧结活性好;且烧结块断口存在明显韧窝组织,其韧性较高,在较低的烧结温度下便可达到较大的致密度、硬度及抗弯强度。将超细铁粉应用到激光焊锯片过渡层中,锯片焊接强度远高于欧盟EN13236标准规定的600 MPa。在烧结压力为35 MPa、烧结温度为810℃、保温时间为3 min时制作刀头,再用此刀头制作锯片,锯片达到的最大焊接强度为1900 MPa。Ultra-fine iron powder was prepared by water-gas atomization process.The physical properties and the mi-cro morphologies of the ultra-fine iron powder,the reduced iron powder and the carbonyl iron powder were compared.The sintered blocks of three kinds of iron powders were prepared under a certain hot pressing process,and their fracture morphologies and mechanical properties were investigated.At the same time,the three kinds of iron powders were ap-plied to the transition layer of laser welding saw blades under certain welding conditions to investigate their welding performances.The results show that the ultra-fine iron powder prepared by water-gas atomization process has fine particles,lower oxygen content,higher purity and sphericity,and better sintering activity.There are obvious dimple structures on the fracture surface of the sintered block,which has higher toughness and can achieve greater density,hardness and bending strength at lower sintering temperature.When the ultra-fine iron powder is applied to the trans-ition layer of the laser welding saw blade,the welding strength of the saw blade is much higher than 600 MPa specified in the EU EN13236 standard.When the sintering pressure is 35 MPa,the sintering temperature is 810℃and the hold-ing time is 3 min,the cutter head is made,and then the saw blade is made with this cutter head.The maximum welding strength of the saw blade is 1900 MPa.

关 键 词：水气联合雾化 超细铁粉 激光焊锯片 过渡层 焊接强度 

分 类 号：TG74[金属学及工艺—刀具与模具] TF123[冶金工程—粉末冶金] TG71[冶金工程—冶金物理化学]