Sulfurizing treatments on the surface of iron powder for preparing high density Fe-Cu-C alloys
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摘要: 突破常規鐵基粉末合金的制備工藝，設計出一種制備高密度Fe-Cu-C合金的新工藝.通過對鐵粉表面進行硫化處理，Fe與S反應合成FeS，均勻包覆在Fe粉顆粒表面，形成一層FeS潤滑薄膜，有利于降低壓制摩擦力.通過X射線衍射、掃描電鏡、和場發射掃描電鏡分析研究材料的物相、元素分布和顯微組織.研究結果表明：包覆在鐵粉顆粒表面的FeS薄膜，有利于提高壓坯密度，活化燒結.當S質量分數為0.5%時，硫化處理的Fe-2Cu-0.8C合金的力學性能優異，壓坯密度7.31 g·cm-3，硬度78.6 HRB，抗拉強度485 MPa；當S質量分數達到0.8%時，多余的FeS占壓制體積分數，導致試樣的壓坯密度降低，力學性能降低.Abstract: Breaking through the conventional P/M processing, a new process for preparing high density Fe-Cu-C alloys was designed. Through sulfuring treatments on the surface of iron powder, Fe reacts with moderate S to generate FeS, which is uniformly coated on the surface of iron powder particles and formed a thin-layered FeS lubrication film. The FeS lubrication film is useful for reducing the friction of compaction. The phase, element distribution and microstructure were characterized by X-ray diffraction, scanning electron microscopy and field emission scanning electron microscopy. The results show that the FeS lubrication film coating on the surface of iron powder is significant to improve the green density and activate sintering. After sulfuring treatments, Fe-2Cu-0.8C alloys with 0.5% S exhibit higher mechanical properties:the green density reaches 7.31 g·cm-3, the hardness 78.6 HRB, and the tensile strength 485 MPa. When the mass fraction of S is 0.8%, redundant FeS accounts for pressing volume fraction, resulting in the decreasing of green density and mechanical properties.
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參考文獻
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