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首页> 外文期刊>Journal of Materials Engineering and Performance >An Investigation on the Wear and Corrosion Behavior of HVOF-Sprayed WC-12Co-Al2O3 Cermet Coating
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An Investigation on the Wear and Corrosion Behavior of HVOF-Sprayed WC-12Co-Al2O3 Cermet Coating

机译：HVOF喷涂WC-12CO-AL2O3金属陶瓷涂层磨损和腐蚀行为的研究

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摘要

The aim of the present study is to develop thermally sprayable WC-12Co and WC-12Co-xAl(2)O(3) (x = 10 and 15 wt.%) cermet coatings on steel substrate (SS 304) by high-velocity oxy fuel (HVOF) method. Influence of Al2O3 addition on the wear and corrosion behavior of WC-12Co coating has been studied. The microstructure and chemical composition of the coatings were analyzed using field emission scanning electron microscope (FESEM), and phase identification was carried out using x-ray diffraction (XRD) studies. The morphology of the coating appears as coarse granular structure. The XRD studies revealed the presence of hexagonal WC phase along with eta-Co6W6C phase. It has been observed from the microhardness measurements, that the values gradually increase from 950 to 1300 HK with the addition of Al2O3 from 0 to 15 wt.%. The wear rate of WC-12Co-15Al(2)O(3) (3.19 x 10(-6) mm(3)/Nm) and WC-12Co-10Al(2)O(3) (5.26 x 10(-6) mm(3)/Nm) coatings was seen to be one order of magnitude lower than that of WC-12Co (2.9 x 10(-5) mm(3)/Nm) coating. The polarization studies revealed that WC-12Co-15Al(2)O(3) cermet coating showed superior corrosion protection than that of WC-12Co-10Al(2)O(3) and WC-12Co coatings. This has been attributed to the gradual decrease in the porosity levels with an increase in Al2O3 content which is supported by morphology studies. The microhardness and wear behavior of WC-12Co-Al2O3 coatings are equivalent to those of hard chrome suggesting the possibility of its replacement.
机译：本研究的目的是通过高速度在钢基板（SS 304）上产生可热喷雾的WC-12CO和WC-12CO-XAL（2）O（3）（X = 10和15重量％）金属陶瓷涂层氧气燃料（HVOF）方法。研究了Al2O3对WC-12CO涂层的磨损和腐蚀行为的影响。使用场发射扫描电子显微镜（FESEM）分析涂层的微观结构和化学成分，使用X射线衍射（XRD）研究进行相位鉴定。涂层的形态表现为粗粒结构。 XRD研究表明，六方WC期的存在以及ETA-CO6W6C相。已经从显微硬度测量中观察到，该值从950逐渐增加到1300 HK，加入Al 2 O 3从0至15重量％。％。 WC-12CO-15AL（2）O（3）（3.19×10（-6）mm（3）/ nm）和WC-12CO-10AL（2）O（3）（5.26×10（ - 6）毫米（3）/ nm）涂层被观察到比WC-12CO（2.9×10（-5）mm（3）/ nm）涂层低一种数量级。偏振研究表明，WC-12CO-15AL（2）O（3）金属陶瓷涂层显示出优于WC-12CO-10AL（2）O（3）和WC-12CO涂层的优异腐蚀保护。这已归因于孔隙率水平的逐渐减小，随着形态学研究支持的Al 2 O 3含量增加。 WC-12Co-Al2O3涂层的显微硬度和磨损行为与硬铬的微硬度和磨损行为相当于表明其更换的可能性。

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