کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1657017 | 1517603 | 2015 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effect of nano-CeO2 on microstructure and wear resistance of Co-based coatings Effect of nano-CeO2 on microstructure and wear resistance of Co-based coatings](/preview/png/1657017.png)
• Nano-CeO2/Co based coatings were deposited by high power laser source.
• Adding nano-CeO2, new phase Ce2Ni7 was detected, and microstructure was refined.
• Adding 1.5 wt.% nano-CeO2, hardness improved 35.3%, and mass loss decreased 55.0%.
Co-based composite coatings with different nano-CeO2 contents were successfully prepared on SPHC steel by laser cladding. The effect of nano-CeO2 on microstructure and properties of Co-based coatings were systematically investigated. The phase construction and microstructure of the coatings were characterized by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray spectrometer (EDS). The hardness and wear resistance of the coatings were evaluated by HV-1000 hardness tester and MM-200 type wear tester at room temperature as well as applied multivariate statistical analysis method. The results indicated that Co-based coatings with nano-CeO2 exhibited an excellent appearance quality, another fine microstructure and new phase Ce2Ni7 appeared. The microhardness and wear resistance of coatings first improved and then decreased with increasing nano-CeO2 content in the coatings and the improvement in microhardness and the reduction in total loss were respectively 35.3% and 55.0%, at 1.5 wt.% nano-CeO2, the wear mechanism was abrasive wear. The great effect of nano-CeO2 addition on microhardness and wear resistance of coatings were consistent with the calculation results of applied multivariate statistical analysis. Thus, it is concluded that adding nano-CeO2 is an effective and attainable way to improve the wear resistance of Co-based coatings.
Journal: Surface and Coatings Technology - Volume 276, 25 August 2015, Pages 565–572