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为提高铁基粉末冶金制品的密度,试验采用高能球磨机在铁基粉末中添加少量不同含量的纳米铜粉体均匀混合,在相同压力750MPa下压制块状试样,在920℃,保护性气氛下进行烧结,烧结时间6h。对不同纳米铜含量烧结后的试样进行了密度、显微组织、硬度、TEM、XRD测试。结果表明:随纳米铜含量的提高,材料的密度明显提高。没有添加纳米铜试样烧结后的密度为6.6g/cm3;添加3%纳米铜的试样烧结后的密度为7.3g/cm3,显微组织中空隙率显著减少,同时提高了制品硬度。原因是纳米铜粉体在铁基颗粒界面上的作用,提高了材料的致密性。
In order to improve the density of iron-based powder metallurgy products, the experiment using high-energy ball mill in the iron-based powder to add a small amount of different content of copper nanoparticles uniformly mixed at the same pressure of 750MPa pressed massive sample at 920 ℃, protective atmosphere Sintering, sintering time 6h. The density, microstructure, hardness, TEM and XRD test of the sintered samples with different nano-copper content were carried out. The results show that with the increase of nano-copper content, the density of the material is obviously increased. The density of sintered samples without addition of nano-Cu was 6.6g / cm3. The density of sintered samples with addition of 3% nano-Cu was 7.3g / cm3, the porosity of microstructure was significantly reduced, and the hardness of the product was increased. The reason is the role of nano-copper powder in the iron-based particle interface, improve the material’s compactness.