نوع مقاله : مقاله یادداشت پژوهشی

نویسندگان

1 دانشیار، دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، تهران، ایران

2 کارشناسی ارشد، دانشکده مهندسی شیمی و مواد، دانشگاه صنعتی شاهرود، شاهرود، سمنان، ایران

3 استادیار، دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری، تهران، تهران، ایران

چکیده

سرامیک­ های کوردیریتی از جمله سرامیک ­هایی هستند که از ترکیب اکسیدهای آلومینیوم، منیزیوم و سیلیسیوم به ­دست می‌آیند. باتوجه ‌به این‌که سرامیک ­های کوردیریتی دارای ویژگی هایی نظیر ضریب انبساط حرارتی بسیار کم، ثابت دی‌الکتریک پایین، چگالی پایین، سختی بالا، ضریب تلفات کم، دیرگدازی و پایداری شیمیایی و مکانیکی مناسبی هستند، می ­توان از آن­ها برای کاربرد در دماهای بالا و ساخت ابزار استفاده نمود. در این پژوهش، برای ساخت نمونه آزمایشگاهی سرامیک کوردیریتی، از روش سنتز حالت جامد پودرهای اکسیدی و رزین سیلیکونی و در ادامه، روش پرس ایزواستاتیک سرد، برای تولید محصولی با تراکم یکنواخت استفاده شد. آزمون‌های فازیابی پراش پرتو ایکس، تعیین چگالی، ریز‌‎سختی سنجی، استحکام خمشی و تعیین ثابت دی­الکتریک روی نمونه ­ها انجام شد. نتایج نشان داد که فاز α-کوردیریت سنتز شده است و دارای چگالی 5/2 گرم بر   سانتیمتر­مکعب، سختی 6/1151 ویکرز، استحکام خمشی 6 ± 4/131 مگا­پاسکال، ثابت دی‌الکتریک 15/3 و تانژانت اتلاف 0048/0 در محدوده بسامد 5/12-8 گیگاهرتز است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Structural Optimization of Cordierite Ceramics Prepared via Cold Isostatic Pressing of Polymer and TiO2

نویسندگان [English]

  • Hamid Reza Zareie 1
  • Loghman Namaki Gharenav 2
  • Akbar Cheraghi 3

1 Associate Professor, Department of Aerospace Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Tehran, Iran

2 M. Sc., Department Chemical and Materials Engineering, Shahrood University of Technology, Shahrood, Semnan, Iran

3 3 Aerospace Engineering, Shahid Sattari Aeronautical University of Science and Technology, Tehran, Tehran, Iran

چکیده [English]

Cordierite ceramics are ceramics obtained from a combination of aluminum, magnesium, and silicon oxides. Given that cordierite ceramics have properties such as very low thermal expansion coefficient, low dielectric constant, low density, high hardness, low loss ratio, refractoriness, and good chemical and mechanical stability, they can be used for high temperature applications and tool making. In this study, solid-state synthesis method using oxide powders and silicone resin, followed by cold isostatic press (CIP) method was applied to produce cordierite ceramic with uniform density. Phase detection by X-ray diffraction and determination of density, microhardness, flexural strength, and dielectric constant was performed. The results showed that the α-cordierite phase was synthesized with a density of 2.5 gr/cm-3, hardness of 1151.6 HV, flexural strength of 131.4 ± 6 MPa, dielectric constant of 3.15, andloss tangent of 0.0048 in the frequency range of 8-12.5 GHz.

کلیدواژه‌ها [English]

  • Cordierite
  • Mechanical properties
  • Cold isostatic press
  • TiO2
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