资源描述：
《镍_磷_纳米氧化铝化学镀层的激光热处理及其摩擦磨损性能》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、第35卷第4期中国激光Vol.35,No.42008年4月CHINESEJOURNALOFLASERSApril,2008文章编号:025827025(2008)0420610205镍2磷2纳米氧化铝化学镀层的激光热处理及其摩擦磨损性能郑晓华宋仁国姚建华(浙江工业大学机械制造及自动化教育部重点实验室,浙江杭州310032)摘要用化学镀技术在中碳钢基片上制备镍2磷2纳米氧化铝复合镀层,并用CO2激光在多种扫描速度及功率密度下对镀层进行热处理.采用能谱(EDS),扫描电子显微镜(SEM),X射线衍射(XRD)、划痕实验和球盘式摩擦磨损
2、实验对镀层的成分、结构形貌、结合力和摩擦学性能等进行表征,并考察工艺参数对镀层结构和耐磨性能的影响.结果表明,激光热处理后镀层由非晶态变为晶态,析出Ni和Ni3P相,而Al2O3仍呈非晶态;镀层硬度因相变硬化而显著提高,表面粗糙度增加和相结构的改变导致摩擦系数上升,镀层结合力小幅度下降,其主要磨损机制为磨粒2磨损.在扫描速度1.5～3.0m/min,激光功率密度5.0～8.3kW/cm范围内,镀层硬度高、耐磨性能优异,最低磨损-53率为1.21×10mm/(N!m).关键词激光技术;镍磷合金;激光热处理;化学镀;氧化铝中图分类号T
3、G115.5;TG156.99文献标识码ALaserHeatTreatmentandWearResistanceofElectrolessPlatingNi2P2Nano2Al2O3CompositeCoatingsZhengXiaohuaSongRenguoYaoJianhua(KeyLaboratoryofMechanicalManufactureandAutomationofMinistryofEducation,ZhejiangUniversityofTechnology,Hangzhou,Zhejiang310032,C
4、hina)AbstractTheNi2P2nano2Al2O3compositecoatingswerepreparedontomediumcarbonsteelsubstratesbyelectrolessplatingmethod.Thetransverse2flowCO2laserwasemployedfortheheattreatmentofthecoatingsatvariousscanvelocitiesandpowerdensities.Thecomposition,microstructure,morphology
5、,adhesiontothesubstrateandwearresistanceofthecoatingswerecharacterizedbyenergydispersiveX2rayspectrum(EDS),scanningelectronmicroscopy(SEM),X2raydiffraction(XRD),scratchtestandfrictionandweartest(ball2on2disk).Theeffectsofprocessparametersonmicrostructureandwearresista
6、nceofthecoatingswereinvestigated.Itisfoundthatthelaserheattreatmentconducesthemicrostructurefromamorphoustocrystallinestructure,whichcomprisesNi3PandNiphase,andAl2O3phaseremainesamorphous;thehardnessofthecoatingsincreasesobviouslyforthephasetransformationhardening.The
7、frictioncoefficientincreasesduetothetransformationofphasestructureandtheraiseofsurfaceroughnessofthecoatings,andtheadhesiontothesubstratedecreasesslightly.Themainoperatingwearmechanismisabrasion.Bytreatingwithscanvelocity1.5～3.0m/min,power2density5.0～8.3kW/cm,thecoati
8、ngsshowhighhardness,goodwearresistanceandaminimumwearrateof-531.21×10mm/(N!m).Keywordslasertechnique;Ni2Palloy;laserheattrea
