مطالعة تاثیر درصد وزنی پودر و اندازة ذرات در کامپوزیت هگزافریت باریم آلاییده شده با منیزیم و تیتانیم/رزین اکریلیک بر منحنی‌های تلفات انعکاسی حاصل از روش پشت‌بند فلزی

نوع مقاله: مقاله پژوهشی

نویسندگان

دانشکده الکتروسرام و مهندسی برق، دانشگاه صنعتی مالک اشتر، تهران، ایران.

چکیده

ترکیبات هگزافریت باریم جانشانی شده با کاتیون­های مختلف یکی از انواع مواد مورد توجه برای تولید کامپوزیت­های جاذب امواج مایکروویو است. در پژوهش حاضر هگزافریت باریم جانشانی شده با منیزیم و تیتانیم با فرمول شیمیاییBaFe9(Mg1.5Ti1.5)O19 جهت مطالعه مورد توجه قرار گرفته است. به منظور بررسی تاثیر اندازه ذرات بر خواص جذب مایکروویو ذرات فریت با ابعاد میکرونی (حدود سه میکرون) و نانو (کمتر از 100 نانومتر) به روش سل ژل و از طریق کنترل نسبت اجزای واکنش و دمای کلسینه تولید شدند. سپس کیفیت تشکیل فاز و مشخصات ریزساختاری پودرها به­ترتیب با استفاده از XRD و SEM مورد مطالعه قرار گرفت. به منظور بررسی کیفیت جذب امواج مایکروویو در نمونه­ها، کامپوزیت­های هگزافریت/ رزین اکریلیک با درصدهای مختلف وزنی پودر به رزین تولید شد. با استفاده از دستگاه تحلیلگر برداری شبکه  (VNA)و با به­کارگیری شیوه اندازه­گیری پشت­بند فلزی، منحنی­های تلفات انعکاسی (RL) کامپوزیت­ها به­عنوان معیاری از قابلیت جذب مایکروویو در باندهای فرکانسی X و Ku اندازه­گیری شد. با بررسی نتایج پژوهش حاضر مشخص شد بر اساس منحنی­های RL کامپوزیت­های هگزافریت/ رزین اکریلیک حاوی ذرات نانومتری نسبت به نوع حاوی ذرات میکرونی در محدودة فرکانسی باندهای X و Ku خواص جذب مایکروویو بهتری دارند. نتایج این بررسی می­تواند در ارتقای عملکرد و طراحی بهینة کامپوزیت های جاذب امواج مایکروویو مفید واقع شود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Weight Percent and Particle Size of (Mg,Ti) Substituted Barium Hexaferrite Powder on Reflection loss Plots of Metal Back Ferrite/Acrylic Resin Composite

نویسندگان [English]

  • Mohammad Jazirehpour
  • Mohammad Hossein Shams
Department of electroceram and electrical engineering, Malek Ashtar University of technology, Tehran, Iran.
چکیده [English]

Barium hexaferrite compositions with different cation substitutions are known as one of the most studied materials to produce microwave absorbing composites. In the present research (Mg,Ti) substituted barium hexaferrite with chemical formula of BaFe9(Mg1.5Ti1.5)O19 have been studied. In order to investigate the effect of particle size and powder percent, micron-size (about 3μm) and nano-size (below 100nm) were synthesized via a modified sol-gel method by controlling the ingredients ratio and calcination temperature. Chemical phase formation and morphological studies were performed by XRD and SEM, respectively. In order to investigate the microwave absorption quality of the samples, ferrite/acrylic resin composites with different powder weight percents were produced. As a criterion of the microwave absorption capability, the reflection loss (RL) plots were measured at X and Ku band by the Vector Network Analyzer system and metal back method. It was found that nano-size particles have better microwave absorption efficiency and the results of the investigation may be used to enhance the design of microwave absorbing composites and their absorption performance.

کلیدواژه‌ها [English]

  • Barium Hexaferrite
  • Sol-Gel
  • Microwave absorption
  • substitution
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