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1、前后处理对电火花沉积TiC涂层性能的影响1,2121罗成,董仕节,熊翔,赵红厉(11湖北汽车工业学院材料工程系,湖北十堰442001;21中南大学粉末冶金国家重点实验室,湖南长沙410083)摘要:以镀锌钢板点焊用铬锆铜球型电极为基体,进行了电火花沉积TiC涂层工艺试验,并分别进行了沉积前处理(清洗与粗化)与沉积后热扩散处理的对比试验,采用SEM、OM、显微硬度计等分析了涂层的微观形貌,测定了涂层的平均硬度与厚度。结果表明,前处理活化了基体表面,减少涂层与基体界面的分层,但不影响涂层内部结构,涂层的厚度和硬度变化不大。后处理促进了元
2、素扩散,明显改善了涂层内部以及界面的微观结构,减少了裂纹和分层,使涂层的厚度减小。后处理释放了涂层内应力,导致涂层硬度降低。关键词:碳化钛;电火花沉积;前处理;后处理;涂层中图分类号:TG174144文献标识码:A文章编号:025426051(2008)0820095204Influenceofpre2treatmentandpost2treatmentonthecharacteristicsofelectrosparkdepositedTiCcoating1,2121LUOCheng,DONGShi2jie,XIONGXiang,
3、ZHAOHong2li(11MaterialEngineeringDept1ofHubeiAutomotiveInstituteofIndustries,ShiyanHubei,442001,China;21StateKeyLaboratoryofPowderMetallurgy,CentralSouthUniversity,ChangshaHu′nan,410083,China)Abstract:TiCcoatingwasdepositedonthesurfaceofCrZrCuspotweldingelectrodeforZin
4、ccoatedsteelbyelectro2spark1Thecontrasttestwasconductedforthesubstratewith/withoutpre2treatment(cleanandpolish),thermaldiffusionpost2treatmentseparately1MicrostructureofthecoatingswerecharacterizedbySEM,hardnessanddepthweremeasuredbymicrohardnesstesterandOMrespectively
5、1Theresultsindicatethatpre2treatmentactivatesthesurfaceofthesubstratesoastoeliminatethelaminationandthehardnessanddepthofthecoatingarenotobviouschange1Post2treatmentpro2motestheelementdiffusion,reducesthemicrocrackwithinthecoatingandlaminationalongtheinterface1Depthoft
6、hecoatingdecreasesandhardnessgoesdownduetocoatingresidualstressrelief1Keywords:TiC;electrosparkdeposition;pre2treatment;post2treatment;coating表面形貌还可以看出:不同位置处理样品均比基体样耐磨损特性。品有着较小的磨损宽度,且样品1最为明显,这与其涂参考文献:层厚度及硬度相对应。[1]SchumacherA,FrechG,WolfGK1Anovelmethodforin2side2coating
7、oftubesandhollowcylindersbyionbeamsput2tering[J]1SurfaceandCoatingsTechnology,1997,89:25822611[2]MaXinxin,TangGuangze,SunMingren,KenYukimu2ra1CharacteristicsofTiNfilmsdepositedonatrench2shapedsamplepreparedbyplasma2basedionimplantationanddepo2sition[J]1SurfaceandCoatin
8、gsTechnology,2005,196:10021031[3]HiroshiFujiyama1Innercoatingoflong2narrowtubebyplas2图7基体及不同位置样品摩擦系数曲线及磨损形貌masputteri
