耐磨性能的影響
(南京航空航天大學(xué) 機(jī)電學(xué)院，南京 210016)
摘 要: 采用漿料包滲法，以Cr2O3 粉為滲Cr源，純Al 粉為還原劑，NH4Cl為活化劑，Al2O3為惰性添加劑，蛋白質(zhì)(雞蛋清)為粘結(jié)劑，在純Cu表面預(yù)先鍍Ni，隨后表面漿料包滲Cr、Al，制備Cr、Al共滲層；研究稀土氧化物CeO2含量對(duì)Cr、Al滲層顯微組織和耐磨性能的影響。采用SEM和XRD測(cè)定滲層的表面形貌和結(jié)構(gòu)。結(jié)果表明：添加稀土氧化物CeO2后，滲層表面顯微組織產(chǎn)生明顯變化，顆粒由大變小，滲層變致密，組織由單一的Ni(Cr、Al)固溶體轉(zhuǎn)變?yōu)橛蒒i3Al相和固溶體混合組成；隨著稀土氧化物CeO2含量的增加，固溶體中Cr含量先增后減，滲層的摩擦因數(shù)先降后升，最小摩擦因數(shù)為純銅的1/3。
關(guān)鍵字: 純銅；Cr2O3粉；CeO2；Cr-Al滲層；稀土氧化物；耐磨性
Cr-Al coating by slurry packing on copper
（College of Mechanical and Electrical Engineering, Nanjing University of
Aeronautics and Astronautics, Nanjing 210016, China）
Abstract:By a slurry pack cementation, with Cr2O3 as chromizing source, pure Al powders as reducers, NH4Cl as activator and albumen (egg white) as cohesive agent, electroplated specimens with a layer of electroplated nickel originally deposited on copper were chromized to prepare Cr-Al coating. The effects of CeO2 content on the microstructure and wear resistance of Cr-Al coating were studied. The surface morphology and structure of coating were examined by means of SEM and XRD. The results show that the grain of the coating becomes small, the coating becomes dense, the microstructure of coating changes from a solid solution of Cr and Al in nickel of single phase into the mixture of Ni3Al phase and a solid solution after adding CeO2 oxides; the Cr content in coating firstly increases and then decreases with the increase of CeO2 content, but the coefficient of friction of coating firstly decreases and then increases with the increase of CeO2 content, and the minimum value is 1/3 that of pure copper.
Key words: pure copper; Cr2O3 powder; Ce2O; Cr-Al coating; rare earth oxide; wear resistance
