HVOF和HVAF涂层的抗气蚀性能比较

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1、CavitationerosionresistancecharacteristicsofHVOFandHVAFprocessed86WC-10Co4CrhydroturbinecoatingsHVOF和HVAF工艺喷涂水力发电机86WC-10Co4Cr涂层的抗气蚀性能比较R.K.Kumar1,M.Kamaraj2,S.Seetharamu1北京东方润鹏科技有限公司译文及供稿1MaterialsTechnologyDivision,CentralPowerResearchInstitute,Bengaluru560080,India2Departme

2、ntofMetallurgicalandMaterialsEngineering,IndianInstituteofTechnology-Madras),Chennai600036,IndiaAbstract摘要Thehydroplantsutilizingsilt-ladenwaterforpowergenerationsuffersfromseveremetalwastageduetobothparticleinducederosionandcavitation.HighVelocityOxy-Fuelprocess(HVOF)basedcoa

3、tingsiswidelyadoptedtoimprovetheerosionlife.TheHighvelocityAirFuel(HVAF)technology,provideshigherparticlevelocitiesandlowerspraytemperaturesandgivesdenseandsubstantiallynon-oxidizedcoating.Thecavitationresistanceof86WC-10Co4CrtypeHVOFcoatingprocessedat740m/ssprayparticleveloci

4、tyhasbeencomparedwithtwoHVAFcoatingsmadeat895m/sand1010m/s.Themechanicalpropertiessuchasporosity,hardness,indentationtoughnessandcavitationresistancewereinvestigated.TheprogressinthesurfacedamagemorphologyduringcavitationwasanalysedinSEM.Theweightlossofcavitatedsurfacewasmeasu

5、redatdifferentintervals.Thehomogeneityofthecohesionbetweendifferentlayershasbeenexaminedqualitativelythroughthemeasurementofscratchdepthacrossthecrosssection.TheHVAFcoatingshaveshownlowerporositylevel,higherhardnessandimprovedcavitationresistance.Bothdelaminationandcompletedet

6、achmentoftheWCgrainswasobservedinHVOFcoatingwhilethevolumeoftheaffectedareaisconsiderablylowinHVAFcoating.现今，水力发电厂利用淤泥水发电多会遭遇严重的金属损耗，这多是由于粒子引起的侵蚀和气蚀造成的。利用HVOF（氧气助燃）超音速火焰喷涂工艺生产的涂层已被广泛应用，用以提高设备的侵蚀寿命。HVAF（空气助燃）超音速火焰喷涂技术，提供更高的粒子速度和较低的喷涂温度，因此可获得更加致密的非氧化涂层。在HVOF粒子速度达到740m/s、HVAF粒子速度

7、在895m/s和1010m/s时喷涂86WC-10Co4Cr，并对2个工艺喷涂涂层做机械性能对比，包括孔隙率、硬度、压痕韧性、耐气蚀等在内的机械性能都进行了检测。在扫描电子显微镜(SEM)下分析气蚀过程中涂层的表面破坏情况。在不同时间段测试受侵蚀涂层表面的重量损耗。通过横截面划痕深度的测量来定性检测各个涂层的粘结强度的均匀性。HVAF涂层显示出了较低的孔隙率、较高的硬度和优秀的耐气蚀性能。在HVOF喷涂涂层中可以观测到碳化钨颗粒的起皮和脱落现象，此现象在HVAF涂层的受害区域出现相对较少。1.Introduction介绍abrasionandslu

8、rrywearresistancehasbeenwellreportedThecomponentsofhydroplant