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突破常规铁基粉末合金的制备工艺,设计出一种制备高密度Fe-Cu-C合金的新工艺.通过对铁粉表面进行硫化处理,Fe与S反应合成Fe S,均匀包覆在Fe粉颗粒表面,形成一层FeS润滑薄膜,有利于降低压制摩擦力.通过X射线衍射、扫描电镜、和场发射扫描电镜分析研究材料的物相、元素分布和显微组织.研究结果表明:包覆在铁粉颗粒表面的FeS薄膜,有利于提高压坯密度,活化烧结.当S质量分数为0.5%时,硫化处理的Fe-2Cu-0.8C合金的力学性能优异,压坯密度7.31 g·cm~(-3),硬度78.6 HRB,抗拉强度485 MPa;当S质量分数达到0.8%时,多余的Fe S占压制体积分数,导致试样的压坯密度降低,力学性能降低.
Break through the preparation technology of conventional iron-based powder alloy and design a new process for preparing high-density Fe-Cu-C alloy.With the sulfurization treatment on the surface of iron powder, Fe and S are reacted to synthesize FeS and uniformly coated on Fe powder The surface of the particles formed a layer of FeS lubricating film, is conducive to reduce the suppression of friction.XRD, SEM and field emission scanning electron microscopy analysis of material phase, elemental distribution and microstructure.The results show that the coating The FeS film on the surface of the iron powder particles is beneficial to improve the density of green compact and activation sintering.When the mass fraction of S is 0.5%, the mechanical properties of the vulcanized Fe-2Cu-0.8C alloy are excellent, the density of the compact is 7.31 g · cm ~ (-3), the hardness is 78.6 HRB and the tensile strength is 485 MPa. When the mass fraction of S reaches 0.8%, the excess FeS accounts for the volume fraction of pressing, resulting in the reduction of the compact density and the decrease of mechanical properties.