نویسندگان

پژوهشگاه مواد و انرژی، پژوهشکده سرامیک، کرج، ایران.

چکیده

در این پژوهش کامپوزیت­ های آلومینا-آهن به منظور ایجاد گرادیان ذرات آهن در زمینه آلومینا به روش ریخته ­گری دوغابی تهیه شد. مقدار آهن 5% وزنی انتخاب و برای ایجاد گرادیان از دو میدان مغناطیسی با بزرگی 8/0 و 08/0 تسلا استفاده شد. دوغاب­ ها با 70، 75 و 80 درصد وزنی ماده جامد و دو پراکنده­ ساز (دیسپرزنت) تهیه و تأثیر آنها بر ایجاد گرادیان آهن بررسی شد. نمونه­ ها در کوره مایکروویو به مدت 30 دقیقه در دماهای C˚1350 و C˚1450 و در دمای C˚1500 به مدت یک دقیقه در آرگون سینتر شدند. برخی از نمونه ­ها نیز در دمای 1485 درجه سانتی­گراد به مدت دو ساعت در کوره تیوبی در آرگون سینتر شدند. نتایج تصاویر ظاهر نمونه ­ها و میکروسکوپ نوری از گرادیان آهن در نمونه­ های خام و سینتر شده نشان داد که استفاده از دیسپرزنت PCN با 70% ماده جامد تحت میدان مغناطیسی 08/0 تسلا بهترین نمونه از نظر توزیع آهن، چگالی (g/cm3 7/3) و استحکام (MPa 7/82) می ­باشد.

کلیدواژه‌ها

عنوان مقاله [English]

Slip Casting of Alumina-Fe Composite Under Magnetic Field

نویسندگان [English]

  • Hudsa Majidian
  • Somayeh Ghaffari Ghods
  • Touradj Ebadzadeh

Materials and Energy Research Center, Department of Ceramic, Karaj, Iran.

چکیده [English]

In this study, alumina-iron composites have been prepared by slip casting in order to provide gradient iron in alumina. 5 wt.% of iron was used under the magnetic fields by the magnitude of 0.8 and 0.08T. Two dispersants were examined as the dispersing agent using 70, 75 and 80 wt.% of solid loading in slips. Samples were sintered in a microwave oven at the temperature of 1350˚C and 1450˚C for 30 minutes, at 1500˚C for 1 minute, and in a conventional tube oven at the temperature of 1485˚C for 2 hours using argon gas. The apparent and optical microscope pictures of green and sintered samples revealed that using PCN and 70 wt.% of solid loading under the mild magnetic field results in the best sample regard as density (3.7 g/cm3 ), strength (82.7 MPa) and iron gradient.

کلیدواژه‌ها [English]

  • Alumina-Fe composite
  • Slip casting
  • Magnetic field
  • Gradient
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