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1、第34卷第7期Vol34No72009年7月HEATTREATMENTOFMETALSJuly2009熱處理工藝對N-iP-PTFE復(fù)合鍍層組織與性能的影響謝華,陳增暉,陳曉(福州大學(xué)機(jī)械工程與自動(dòng)化學(xué)院,福建福州350002)摘要:采用掃描電鏡、X射線衍射、差熱分析研究了熱處理對N-iP-PTFE(聚四氟乙烯)化學(xué)復(fù)合鍍鍍層組織的影響,并研究了鍍層的磨損性能。結(jié)果表明,經(jīng)4001h處理后,PTFE的揮發(fā)主要發(fā)生在鍍層的表層,內(nèi)部的PTFE含量變化很小;鍍態(tài)條件下,鍍層為非晶態(tài),經(jīng)4001h處理晶化后生成Ni相及Ni3P相。N-iP-PTFE復(fù)
2、合鍍層的晶化起始溫度和峰值溫度都高于N-iP鍍層。N-iP-PTFE復(fù)合鍍層的激活能為235kJ/mo,l與N-iP鍍層的激活能差別不大。鍍層摩擦系數(shù)在PTFE加入量為8mL/L時(shí)最小,同時(shí)鍍層磨損量最小;熱處理后,N-iP-PTFE復(fù)合鍍層表現(xiàn)出較好的耐磨性和較小的摩擦系數(shù)。關(guān)鍵詞:化學(xué)復(fù)合鍍;聚四氟乙烯(PTFE);顯微組織;耐磨性中圖分類號:O794;TG17441文獻(xiàn)標(biāo)識碼:A文章編號:0254-6051(2009)07-0053-05InfluenceofheattreatmentonmicrostructureandpropertiesofN
3、-iP-PTFEelectrolesscompositecoatingXIEHua,CHENZeng-hu,iCHENXiao(InstituteofMechanicalEngineering&Automatic,FuzhouUniversity,FuzhouFujian350002,China)Abstract:TheinfluenceofheattreatmentonmicrostructureofN-iP-PTFEelectrolesscompositecoatingwasanalyzedwithSEM,XRDandDSC,andwearresistance
4、ofthecoatingwerestudiedTheresultsshowthatthevolatilizationofthePTFEtakesplacemainlyinthesurfacelayerandthechangeofinteriorPTFEcontentissmallafterheattreatmentat400for1hThecoatingasdepositedpresentsamorphous,crystallizationcompletesafterheattreatmentat400for1h,andN,iNiPphasesarefor
5、medThecrystallizationonsettemperatureandthe3peaktemperatureoftheN-iP-PTFEcompositecoatingarehigherthanthoseoftheN-iPcoating,andthecrystallizationactivationenergyofN-iP-PTFEcompositecoatingis235kJ/mo,lwhichiscomparativewiththatofN-iPcoatingThefrictioncoefficientandthewearlossarethele
6、astwhentheaddingamountofPTFEis8mL/LComparedwiththeN-iPcoating,N-iP-PTFEcompositecoatingshowsbetterwearresistanceandthelowerfrictioncoefficientunderdifferentheattreatingtemperatuerKeywords:electrolesscompositedeposition;polytrafluoroethylene(PTFE);microstructure;wearresistance化學(xué)鍍鎳磷
7、合金具有操作簡單,鍍層厚度均勻、硬復(fù)合鍍層,鍍態(tài)時(shí)均可獲得非晶態(tài),但非晶態(tài)是熱力學(xué)度高、孔隙率低及耐蝕性優(yōu)異等特點(diǎn),近年來在工業(yè)中亞穩(wěn)態(tài),在適當(dāng)?shù)臈l件下(如加熱),非晶態(tài)必然要逐[1-2][11]的應(yīng)用日益廣泛。為了滿足一些特殊材料的要求,步向平衡晶態(tài)轉(zhuǎn)變,即發(fā)生晶化。非晶態(tài)鍍層的晶[3-4]人們開發(fā)了化學(xué)復(fù)合鍍技術(shù),即通過在鍍液中加入化可導(dǎo)致某些性能下降,如鍍層韌性、耐蝕性,但其它SiC、金剛石等一些硬粒子,使其與Ni、P共沉積,明顯一些性能會變得更加優(yōu)異,尤其是硬度和耐磨性的增[5-6]提高鍍層的硬度及耐磨性;或是加入石墨、聚四氟加最為明顯;此外,由于PTFE
8、的軟化點(diǎn)為