10400

9595

كارشناسي ارشد

خوردگي و حفاظت از مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1394

سيزده، 95ص.: مصور، جدول، نمودار

كيوان رئيسي، فتح اله كريم زاده

1394/06/07

محمدحسن عباسي، محمد ژياني

1396/10/04

كتابنامه

مواد

مهندسي مواد

ID9595

به فارسي و انگليسي

108 Effect of tungsten onproperties of nano structured Crofer22APU stainless steel produced by mechanical alloying for using as interconnect plates of solid oxide fuel cells Mohammad Rezvani Mohammad Rezvani@ma iut ac ir June28 2445 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Dr K Raeissi Assoc Prof E Mail K Raeissi@cc iut ac irDr F Karimzadeh Assoc Prof E Mail Karimzadeh F@cc iut ac irAbstractIn this study the effect of tungsten on properties of Crofer22APU stainless steel produced bymechanical alloying for using as interconnect plates of solid oxide fuel cells have beeninvestigated This alloy was produced by mechanical alloying for 40 h and in order to create adense bulk sample from produced alloy powder with porosity less than 5 SPS method wasused In this method for pressing the alloy powder a 50 MPa stress and temperature of 1100 Cwere used during 10 min and then to achieve the desired properties of a metal interconnectsuitable for using in solid oxide fuel cells including low electrical resistance high oxidationresistance and thermal expansion coefficient matching with other components of the cell manganese cobalt spinel coating was applied This coating was deposited on Crofer alloy substrateby electrodeposition using current density of 150 mA cm2 in 40 min and following that theproperties of the alloy coated and uncoated including hardness oxidation behavior and electricalresistance of the surface was examined The oxidation behavior of the alloy for both uncoated andcoated from zero to 100 h of oxidation was in sinusoidal shape and obeyed no specific law Theelectrical resistance of alloy without the coating after 100 h of oxidation was about 0 3 m cm2 andfor coated one was less than this amount After that 0 2 wt tungsten was added to the alloy andthe mechanical alloying was continued for 80 h all steps including coating and evaluation ofproperties of coated and uncoated samples were analyzed as Crofer alloy Thealloy containtungsten element showed higher hardness 700 Vickers compared to 100 Vickers for Crofer andoxidation resistance respect to Crofer alloy Area specific resistance of alloy with and withouttungsten after 100 h oxidation was in the same range but the alloy containing tungsten had a littlemore electrical resistance The alloy produced by mechanical alloying compared to commercial oneproduced by casting showed a similar oxidation behavior after 100 h oxidation but the areaspecific resistance of the sample produced by mechanical alloying was significantly less than thecommercial one Adding tungsten to alloy improved all properties of the alloy required for using asinterconnect plates in solid oxide fuel cells whiles adding elements such as tungsten with meltingtemperature of 3422 C to Crofer22APU alloy trough casting is very difficult Because the tungstenaccelerated the formation of manganese cobalt spinel on chromia the depletion of chromium fromalloy due to evaporation of chromium oxide on surface of the alloy was decreased Keywords Solid Oxide Fuel Cell Interconnect plates Crofer22APU Mechanical alloying Tungsten metal Hardness Oxidation Area Specific Resistance

كيوان رئيسي، فتح اله كريم زاده

محمدحسن عباسي، محمد ژياني