粒度搭配对水雾化铁粉工艺性能的影响  

Effect of particle size mixed on the properties of water-atomized iron powder

作　　者：羊求民[1,2] 李松林[1,2] 陈文[1,2] 杨宝刚[1] 向锦涛[1,3] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]莱芜市粉末冶金先进制造重点实验室,山东莱芜271100 [3]湖南大学化学化工学院,长沙410082

出　　处：《材料科学与工艺》2012年第4期94-98,103,共6页Materials Science and Technology

基　　金：湖南省科技计划资助项目(2012GK3172);粉末冶金国家重点实验室创新基金资助项目(200902);莱芜市粉末冶金先进制造重点实验室开放基金资助项目(201101)

摘　　要：为了研究粒度组成对水雾化铁粉松装密度、流动性、压缩性及压制过程的影响,将-80+100目和-325目两种粒径的水雾化纯铁粉以不同比例搭配进行研究.结果表明:通过控制不同的粒度组成,铁粉松装密度在2.84～3.42 g/cm3内变化、铁粉流动性在20～31 s/50 g内变化;与纯粗粉样品A相比,在粗粉中添加质量分数25%细粉的样品B在低压(<300 MPa)下压坯密度增加,高压(≥300 MPa)时压坯密度减少;细粉质量分数为75%时的样品D与样品C相比,压坯密度均增加;全部采用-325目细粉的样品E与样品D相比,压坯密度均降低.当压制压力低于300 MPa时,压坯致密化主要由颗粒的滑移、重排决定;当压制压力高于300 MPa时,压坯致密化主要以粉末的塑性变形为主.Different proportions of two kinds（ -80 ＋ 100 mesh and -325 mesh） of water atomized pure iron powder were taken to study the different effect on the apparent density, flowahility, compressibility and com- pression process. The results showed that the apparent density of iron varied in the range of 2.84 - 3.42 g./cm3 and the flowability in 20 - 31 s/50 g by controlling the composition of different particle size. Compared to coarse powder, when 25 % fine powder was added in the coarse powder, the green density increased at the low pressure （ 〈300 MPa） and decreased under high pressure （〉I 300 MPa）.When the fine powder＇s ratio in- creased to 75%, the green density increased. Further more, the fine powder＇s ratio increased to 100%, the value of green density is decreased. At low pressure （ 〈 300 MPa） , the mechanism of compact densification is the slippage and rearrangement of particle ; Under high pressure （ ≥ 300 MPa）, however, the mechanism of corn-pact densification is the plastic deformation of powder.

关 键 词：粉末冶金 水雾化 铁粉 粒度组成 压制性 

分 类 号：O643.364[理学—物理化学]