包渗温度对Ti-Al渗层组织和耐磨性能的影响-论文.pdf

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1、Availableonlineatwww．sciencedirect．cornTransactionsofScienceDireCtNonferrousMetalsSocietyofChinaEISEⅥERPressTrans．NonferrousMet．Soc．China24(2014)449—454www．tnmsc．cnEffectsofslurrypackcementationtemperatureonmicrostructureandwearresistanceofTi——A1co—depositedcoatingoncopperplatednickellayerHong。

2、xingWANG,YanZHANG,Shao—fengYANG,Bing—yiLIUSchoolofMaterialsEngineering，NanjingInstituteofTechnology,Nanjing211167，ChinaReceived2November2012；accepted20December2013Abstract：Inordertoimprovethewearresistancepropertiesofcoppersubstrate，alayerofelectroplatednickelwasfirstlydepositedoncoppersubstrat

3、e，subsequentlytheseelectroplatedspecimensweretreatedbyslurrypackcementationprocesswithaslurrypackcementationmixturecomposedofTiO2astitanizingsource，pureAlpowderasaluminzingsourceandalsoareducerfortitanizing．allactivatorofNH4C1andalbumen(eggwhite)ascohesiveagent．TheTi—Alcoatingwasfabricatedonthe

4、surfaceofelectro—depositedmckellayeroncoppermatrixfollowedbytheslurrypackcementationprocess．TheeffectsofslurrypackcementationtemperatureonthemlcrostructuresandwearresistanceofTi—Alcoatingwerestudied．TheresultsshowthatthemicrostructureofthecoatingchangedfromNiAI+Ni3(Ti，A1)toNiA1+Ni3(Ti，A1)+Ni4Ti

5、3toNi4Ti3+NiA1，andtoNiA1_N(Ti，A1)+NiTiwithslurrypackcementationtemperaturerangingfrom800。Cto950。Cin12h．The衔ctioncoeficientofTi—Alcoatingdecreasedandthehardnessincreasedwithlncreaslngtheslurrypackcementationtemperature．Theminimumfrictioncoefficientwas1／3andtheminimumhardnesswas5timeslargerthanth

6、atofpurecopper．Keywords：Ti—Alcoating；Ni—Tiintermetalliccompound；Ni—A1intermetalliccompound；slurrypackcementationtemperature；wearresistanceprocesseshavebeenusedwidelytodeposit1Introductionhi曲一temperatureoxidationandwearresistancecoatings，suchasaluminizing[6，7]，titanizing[8,9]andCopperiswidelyuse

7、dbecauseofitssuperiorsiliconizingf10-161．Howevegfewstudieshavebeenelectricalandthernlalconductivity．Moreover．theperformedonemployingthepackcementationprocesstocharacteristicsofcoppermakethismetalsuitableforafabricatetheTi—A11ayero