HVAF喷涂WC-10Co4Cr涂层及其性能
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摘要
分别采用空气助燃高速热喷涂技术(HVAF)和氧气助燃高速热喷涂技术(HVOF)制备了WC-10Co4Cr涂层。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征和分析了不同的粉末和涂层的物相组成、微观组织结构,并对不同涂层的显微硬度、孔隙率、抗冲蚀性能进行了对比,探讨了涂层在泥沙中的冲蚀机理。结果表明:采用HVAF方法制备的涂层致密度好,其在显微硬度和抗冲蚀性能方面要优于HVOF方法制备的涂层;WC颗粒细化增强了涂层的显微硬度和韧性,提高了涂层的抗微切削和抗疲劳剥落性能,有利于提高涂层的抗冲蚀性能。
WC-10Co4Cr coatings were prepared by high velocity air fuel(HVAF)thermal spraying and high velocity oxygen fuel(HVOF)thermal spraying,respectively.The phase composition and microstructure of different powders and coatings were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The microhardness,porosity and erosion resistance were compared between different coatings.Erosion failure mechanism of the coatings in sandy stream was analyzed as well.The results indicate that the coating prepared by HVAF with good density was superior to the coating prepared by HVOF in micro-hardness and erosion resistance.The refined WC grains could improve the micro-hardness and toughness of the coatings,resulting in the increase of micro-cutting resistance and anti-fatigue spalling properties,and thus enhance the erosion resistance for the coatings.
WC-10Co4Cr coatings were prepared by high velocity air fuel(HVAF)thermal spraying and high velocity oxygen fuel(HVOF)thermal spraying,respectively.The phase composition and microstructure of different powders and coatings were characterized by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The microhardness,porosity and erosion resistance were compared between different coatings.Erosion failure mechanism of the coatings in sandy stream was analyzed as well.The results indicate that the coating prepared by HVAF with good density was superior to the coating prepared by HVOF in micro-hardness and erosion resistance.The refined WC grains could improve the micro-hardness and toughness of the coatings,resulting in the increase of micro-cutting resistance and anti-fatigue spalling properties,and thus enhance the erosion resistance for the coatings.
引文
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[13]王群,屈帮荣,唐瞾肸,等.超音速火焰喷涂碳化钨-钴涂层磨粒磨损行为[J].中国有色金属学报,2015,25(7):1920-1927.
[14]NERZ J,KUSHNER B,ROTOLICO A.Microstructural evaluation of tungsten carbide-cobalt coatings[J].Therm Spray Technol,1992,1(2):147-152.
[15]马光,于艳爽,王国刚,等.活性燃烧高速燃气喷涂WC-CoCr涂层的微观组织及性能[J].金属热处理,2008,33(2):36-40.
[16]ZHOU R,JIANG Y H,LU D H.The effect of volume fraction of WC particles on erosion resistance of WC reinforced iron matrix surface composites[J].Wear,2003,255:134-138.
[2]GUY B,PAUL J P.Nanostructured coatings[J].Materials Science and Engineering:A,2002,336:274-319.
[3]张光华,李曙,等.HVOF喷涂WC-10Co-4Cr涂层的砂浆冲蚀行为[J].中国表面工程,2007,20(4):16-28.
[4]WU J D,WANG Y S,BAI M R.Development of an expert system for fault diagnosis in scooter engine platform using fuzzy-logic inference[J].Expert Systems with Applications,2007,33(4):1063-1075.
[5]JACOBS L,HYLAND M M,BONTE D M.Comparative study of WC cermet coatings sprayed via the HVOF and the HVAF process[J].Journal of Thermal Spray Technology,1998,7(2):213-218.
[6]马光,王国刚,孙冬柏,等.两种AC-HVAF喷涂WC涂层微观组织及其耐蚀性研究[J].材料工程,2007(8):73-78.
[7]李阳,刘阳,段德莉,等.HVOF热喷WC-CoCr涂层在不同攻角下的料浆冲蚀行为[J].中国表面工程,2011,24(6):11-18.
[8]SAHRAOUI T,GUESSASMA S,JERIDANE M A,et al.HVOF sprayed WC-Co coatings:microstructure,mechanical properties and friction moment prediction[J].Materials and Design,2010,31(3):1431-1437.
[9]马宁,程振雄,乌焕涛,等.粉末结构对HVOF喷涂WC-Co涂层组织性能的影响[J].稀有金属材料与工程,2015,44(12):3219-3223.
[10]BARBER J,MELLOR B G,WOOD R J K.The development of sub-surface damage during high energy solid particle crosion of a thermally sprayed WC-CoCr coating[J].Wear,2005,259:125-134.
[11]YE F X,CUI C,YANG X,et al.Microstructures and properties of submicron structural WC-12Co coatings deposited by HVOF[J].China Welding(English E-dition),2011,4(20):22-27.
[12]金国,徐滨士,王海斗,等.电热爆炸喷涂WC/Co涂层组织和性能[J].金属热处理,2006,31(2):23-26.
[13]王群,屈帮荣,唐瞾肸,等.超音速火焰喷涂碳化钨-钴涂层磨粒磨损行为[J].中国有色金属学报,2015,25(7):1920-1927.
[14]NERZ J,KUSHNER B,ROTOLICO A.Microstructural evaluation of tungsten carbide-cobalt coatings[J].Therm Spray Technol,1992,1(2):147-152.
[15]马光,于艳爽,王国刚,等.活性燃烧高速燃气喷涂WC-CoCr涂层的微观组织及性能[J].金属热处理,2008,33(2):36-40.
[16]ZHOU R,JIANG Y H,LU D H.The effect of volume fraction of WC particles on erosion resistance of WC reinforced iron matrix surface composites[J].Wear,2003,255:134-138.