润滑剂对Fe基粉末冶金材料温压工艺的影响

Effects of lubricants on the warm compaction process of Fe-based powder metallurgy materials

通过扫描电子显微镜观察和性能测试研究了硬脂酸锌、乙烯基双硬脂酰胺(ethylene bis stearamide,EBS)、复合润滑剂以及压制温度对Fe基粉末冶金材料温压工艺的影响规律。结果表明:当润滑剂加入量(质量分数)超过0.4%后,Fe基粉末的流动性和松装密度均随润滑剂加入量的增加而降低,其中加入单一EBS润滑剂的影响更大。添加润滑剂后增加了Fe基粉末冶金生坯的致密度,其中添加硬脂酸锌和复合润滑剂的Fe基粉末冶金生坯断口颗粒间结合更为紧密。润滑剂对提高Fe基粉末冶金试样生坯密度、烧结密度及抗弯强度的作用顺序为复合润滑剂>硬脂酸锌>EBS,Fe基粉末冶金材料的密度和力学性能均随温压温度的升高而增加。在最佳润滑剂加入量0.4%时,120℃温压Fe基粉末冶金试样密度比室温压制Fe基粉末冶金试样的密度提高了0.14~0.21 g/cm^3,硬度和抗弯强度提高了40%~65%。

The effects of zinc stearate, ethylene bis stearamide （EBS）, composite lubricant, and compaction temperature on the warm compaction process of Fe-based powder metallurgy （PM） materials were investigated by scanning electron microscopy （SEM） and properties tests. The results show that the apparent density and flow rate of Fe-based powders decrease with increasing lubricant content when the lubricant content is higher than 0.4%, and the effect of EBS is the greatest. The density of Fe-based PM green compacts increases by use of lubricants, and the particles combine more closely when zinc stearate and composite lubricant are used. The effect of lubricants on the green density, sintered density, and bending strength of Fe-based PM samples is composite lubricant 〉 zinc stearate 〉 EBS in order, and the density and mechanical properties of Fe-based PM materials increase with increasing compaction temperature. When the lubricant content is 0.4%, the density of Fe-based PM samples by warm compaction at 120 ℃ are improved by 0.14,4）.21 g/cm3 compared to that of the conventional compaction samples, and the hardness and bending strength are increased by 40% -65%.