等离子熔覆MO／NI基合金涂层的组织结构及耐磨性能

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1、维普资讯http://www.cqvip.com第16卷第9期中国有色金属学报2006年9月V0I．16No．9TheChineseJournaIofNonferrousMetaIsSep．2006文章编号：1004—0609(2006)09—1595—08等离子熔覆M0／Ni基合金涂层的组织结构及耐磨性能①侯清宇，何宜柱，高甲生(安徽工业大学材料科学与工程学院，马鞍山243002)摘要：应用光学显微镜、扫描电镜(SEM)、x射线衍射(XRD)、透射电镜(TEM)以及滑动磨损实验，研究不同Mo加入量对等离子熔覆镍基合金涂层组织结构和性能的影响。结果表明，熔覆层主要是由面心立方结构的Y(

2、Ni，Fe)固溶体、六方结构的M(c，B)和四方结构的Cr2B等物相构成，在镍基固溶体中存在明显的成分偏析。Mo的加入没有改变熔覆层的相结构，但硼碳化物的相对含量却有所提高，成分偏析逐渐减弱，直至消失，并且促进了等轴晶的形成。Mo的加入可以提高熔覆层的耐磨性能，当其加入量在6以内时，随着Mo加入量的提高，熔覆层的耐磨性逐渐提高。但是，当加入量达到8时，耐磨性能开始降低。关键词：等离子熔覆；镍基合金；钼；组织结构；耐磨性中图分类号：TGl13．12；TG456．2文献标识码：AMicrostructureandwearresistanceofMo／Ni-basedalloycoating

3、producedbyplasmacladdingHOUQing—yu，HEYi—zhu，GAOJia—sheng(SchoolofMaterialsScienceandEngineering，AnhuiUniversityofTechnology，Ma’anshan243002，China)Abstract：TheeffectofdifferentMoadditionsonthemicrostructureandwearresistanceofthenickel—basedalloycoatingproducedbyplasmacladdingwasinvestigatedusingo

4、pticalmicroscope，scanningelectronmicroscope(SEM)，X-raydiffraction(XRD)，transmissionelectronmicroscope(TEM)，andslidingweartest．Theresultsshowthatthey(Ni，Fe)solidsolutionwithaface-centeredcubiccrystalstructureispresentedaccompaniedbytheM7(C，B)3withahexagonalcrystalstructureandCr2Bwithatetragonalcr

5、ystalstructureinthenickel—basedalloycoating．Theobviouscomponentsegregationexistsinthenickel—basedsolidsolution．TheadditionofModoesnotchangethephasecomposition，thoughtherelativecontentofborideandcarbideincreases．Meanwhile，thecompo—nentsegregationdecreasesgraduallythendisappearsfinallywiththeincre

6、asingMocontent．TheequiaxedcrystalscomeintobeingintheMo-modifiedcoating．TheadditionofMoincreasesthewearresistance．ThewearresistanceincreaseswiththeincreasingMocontentwhenitscontentislowerthanorequalsto6．Onthecontrary，thewearresistancedecreasesagainwhentheMocontentequalsto80A．TheadditionofMocanhom

7、ogenizethecomponent，promotetheformationofequiaxedcrystals，andincreasetherelativequantityofborideandcarbide．Alltheseresultsarebeneficialtoincreasingthewearresistanceofthecladdingcoating．Keywords：plasmacladding；nickel—basedall