بهينه سازي جرم هاي نسوز آلومينا-كاربيد سيليسيم

چكيده انگليسي :

Optimization of Refractory Castebles Alumina Silicon Carbide Carbon for Using in Melt Runner Elham Rahimi e rahimi@ma iut ac ir Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisor Ahmad Monshi a monshi@cc iut ac irRahmatolahe Emadi r emadi@cc iut ac irAbstractRecently Alumina Silicon Carbide Carbon castable have attracted attension due to corrosion resistance thermal stability and thermal shock resistance The main use is in melt and slag runners At first regular cementrefactory castable were in use but CaO content of the cement could decrease high temperature properties leading to Low Cement Castable and Ultra Low Cement Castable in the last decade In This study proportion oflow cement alumina silicon carbide refractory castables are considened to produce iron melt runners in iron andsteel industry Different size of silicon carbide from 16 to 1200 mesh are used Highes silicon carbide contentinceares the resistance to melt and slag On the other hand development of CO and CO2 gases in increased Inthis study Phosphate bond was also used together with hydrated alumina bond and ceramic sintering bond atNCC different parameters such as the kind and amount of raw materials and aggregates particle size distributionaccording to Andreasen equation suitable binder at different firing temperatures were considered and BulkDensity BD Apparent Porosity AP Cold Crushing Strength CCS were measured and XRD and SEMconsideration were performed Phosphate bond was also used together with hydrated alumina bond and ceramicsintering bond at NCC Phosphate bond was also used together with hydrated alumina bond and ceramicsintering bond at NCC different parameters such as the kind and amount of raw materials and aggregates particle size distribution This is specially useful at 800 1000 C that hydrated alumina is eliminated and sinteringis not produced Results showed that by using suitable amounts of hexa meta phosphate with calcined alumina at 110 C and firing at 800 C AlPO4 is produced in the matrix that together with hydrated alumina increase thestrength and other properties of No Cement Castable NCC Phosphate bond was also used together withhydrated alumina bond and ceramic sintering bond at NCC Phosphate bond was also used together withhydrated alumina bond and ceramic sintering bond at NCC different parameters such as the kind and amount ofraw materials and aggregates particle size distribution This is specially useful at 800 1000 C that hydratedalumina is eliminated and sintering is not produced this study Phosphate bond was also used together withhydrated alumina bond and ceramic sintering bond at NCC different parameters such as the kind and amount ofraw materials and aggregates particle size distribution according to Andreasen equation suitable binder atdifferent firing temperatures were considered Phosphate bond was also used together with hydrated aluminabond and ceramic sintering bond at NCC By adding 2 chromic oxide and 1 zircon reaction with hexa metaphosphates develope chromium phosphate Cr2P2O8 and zirconium phosphate ZrP2O7 at 800 C Aggregatesof chamotte pyrophilite and bauxite with phosphate bonds has developed a suitable NCC Key words refactory castable slag runners NO Cement Castable Andreasen equation

رحيمي، الهام

بهينه سازي جرم هاي نسوز آلومينا-كاربيد سيليسيم - كربن جهت راهگاه جوي مذاب

جرم هاي ريختني , فرمول آندريازن , جرم نسوز بدون سيمان