The Erosion-corrosion Resistance of Tungstencarbidecarbide Hard Metals 钨硬质合金地冲蚀耐蚀性.pdf

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1、Int.J.ofRefractoryMetals&HardMaterials15(1997)81-87©1997ElsevierScienceLimitedPrintedinGreatBritain.Allrightsreserved0263-4368/97/$17.00ELSEVIERPll:S0263-4368(96)00016-9TheErosion-corrosionResistanceofTungsten-carbideHardMetalsE.J.WentzelBoartLongyearResearchCentre,

2、Krugersdorp,SouthAfrica&C.AllenDepartmentofMaterialsEngineering,UniversityofCapeTown,SouthAfrica(Received22November1995;accepted2February1996)Abstract:Aseriesofcementedtungsten-carbideswithdifferentbinderphasesconsistingofcombinationsofcobalt,nickelandchromiumhavebe

3、ensubjectedtoerosion-corrosiontestingusingasilica-waterslurry.Thepolarisationcharacter-isticsofthesecermetshavebeeninvestigatedusingapotentiodynamictechnique.Thedifferencesinbindercompositioninfluencesthecermets'propertiesandcorrosionbehaviour,whichinturnaffectsthes

4、ynergisticactionoferosion-corro-sion.Theinherentcorrosionresistanceofapurenickelbinderdidnotincreasetheslurryerosionresistanceofthecermets,butthenickel-chromium-cobaltgradeswerefoundtoimprovetheerosion-corrosionbehaviourcomparedtothepurecobaltbindergrade.Comparisons

5、aremadebetweenthepropertiesandbehaviourofNi-Cr-Cobasedcermetsandpuremetalgradeswithcompositionssimilartothosefoundinthebinderphaseofthecorrespondingcermetgrades.Explanationsareadvancedtoexplainthedifferencesinbehaviourlinkedtocompositionandmechanicalproperties.©1997

6、ElsevierScienceLimited1INTRODUCTIONwearresistanceinaggressiveenvironments,othermetallicalloycompositionshavebeenItisapparentthatmaterialssubjectedtoslurryformulated)Inthiswork,slurryerosionratesenvironmentsmustnotonlyresisttheerosionforcobalt,nickel,nickel-chromiuma

7、ndnickel-ofsolidparticlesandliquids,butalsoberesist-chromium-cobaltbasedhardmetalsarecom-anttodamagecausedbycorrosion.Thesetwoparedwithrespecttotheiroverallbehaviour.factorsmayinteractsynergisticallytoproduceInordertoestablishtheinfluenceofbinderwearratesthataregrea

8、terthanthesumofcompositiononthebehaviourofcermets,thetheirseparateeffects.''2Theabilityofthebehaviourofpuremetalalloyswithcomposi-material