氮基气氛热处理技术进展

(,200072):,:;;:TG156.8:A:025426051(2002)1220030204ProgressinNitrogenBasedAtmosphereHeatTreatmentCHENZhi2yuan(ShanghaiJinghuaMech.&Elec.NewTechnologyInstitute,Shanghai200072,China)Abstract:Thefunctionofnitrogeninheattreatmentatmosphere,thecompositionsofnitrogenbasedatmosphere,andthemethodforpreparationofnirtogenwasintroduced.Andseveralwaystoprovidenitrogenwerealsocom2pared.Keywords:nitrogenbasedatmosphere;methodforpreparationofnitrogen:(1941.7),,,,,PSA,2,40,3():021266541219,56334037:20012032212040,W.H.Holcoroft,,2070,,,2070,,1,,,,,,,,COH2O,,,,CO2H2O,COCO2H2OCrMnSi,,,,,,,,,;,,,,,(1)2(),,2,40%9718%(COH2),,,:(1)(2)(3)(4)H2NH3CO2H2O,,,,,,,,BOC991999%;TM991995%;RM991999%;3,,,03200227121Table1MaintypesandapplicationsofnitrogenbasedatmosphereN2N2+H2N2+H2+CmHnN2+CmHnN2+CH3OHAr+H2N2+CO2+CmHn+CmHn+NH3+NH3+NH32Table2Compositionsofnitrogenbasedatmosphereadoptedabroad(%)COH2CH4CO2N270%H2+30%H270%H2+30%CH3OH9200140167099198%N2+0102%C3H7OH017115971840%H2+60%CH3OH194101301440Holcroft55%N2+44%CH3OH+1%C3H8131728018011571485%N2+C3H8+CO246810018015010411185(NCC)81%N2+19%CH4Allison85%N2+3%C3H8+12%(CAP)79%N2+7%CH4716701057088%N2+4%C3H8+8%NH3(50%80%)N2+(50%20%)NH3+(2%5%)CO23Table3RequirmentsofseveralnitrogencustomersintheU.S.A(%)IPSEN99189910991999Lindberg9910Holcroft99195Allison991997,991993,:(1)()40L,15MPa,6m3,9915%N2()14,99199%N230,991999%N2902141015(2),(3)643(,1m3643m3),(99199%),,,,,,,1320022712,,,300km,,,215/m3(4),(014016)/m3,115/m344Table4Nitrogencostsofdiferentfeedingways/m-3214152150.40161154,,5PSA5Table5Comparisonofmainparametersamonythecryogenic,PSAandmembraneseparationmethods()/kWhm-30162014016()014016()/m-30160115013012013/m3h-150005000105000(%)999919999899199989919/MPa016()0181()/-40-60-7020h20min4min,,,8,12,3,,()()/m124104/,415%411,(),,,,,,,,,,,,,,,,(1224h),3500m3/h(),PSA20%50%,412(PressureSwingAdsorptionPSA)2030,PSA,,2050,,PSA2070,,PSA,,PSA,10,,,PSA40,,,,,,2320022712,,,,,,,,:,,,,,,,,,,(1530min),,,,,,,,(30005000)m3/h(),,1000m3/h,,4132080,,,580t/d,90%99%N2,600t/d97%99%N2,,,,,,,(3min),,,,,,98%,98%,,30%5,,,,PSA,,:[1].[M].:,1989.10.[2]PSA[C].,1999,4.1,1,1,1,2(11,210018;21,214433):,SBR45,SEMEDAXXRD,,,FeS,63HV;,(0151)h10m:45;;;:TG156.81:A:025426051(2002)1220033203BrineSulfurizingatRoomTemperatureJIANGJing2hua1,JIANGJian2qing1,MAAi2bin1,TUYi2you1,ZHAIXiao2dong2(11DepartmentofMaterialsScienceandEngineering,SoutheastUniversity,Nanjing210018,China;21JiangsuFastenLimitedCompany,JiangyinJiangsu214433,China)Abstract:Anewprocess,liquidsulfurizingatroomtemperaturehadbeendevelopedtoformthesulfidelayeronquenched45steelsurface.Themicro2hardnessdistributionofsulfidelayerwasstudied,anditsmorphologyandstructurewasanalyzedbySEM,EDAXandXRD.Theresultsshowthatthesulfidelayerwithuniformthicknesscouldbeformedonthehigh2hardnesssurfaceof45steelandvariedwithsulphurizingtreatmenttime.ThesulfidelayersarelaminarandconsistmainlyFeSphaseswithamicro2hardnessofabout63HV.Thesulfurizingratecanbeenhancedwithreasonableadjustmentoftheconcentrationofsulfurizingsaldbath.Keywords:45steel;roomtemperature;liquidsulfurizing;sulfidelayer:(197118),,,,,,10:02523792703(),3689552,E2mail:[e-mail]:(BK99206):20022062151,3320022712