بررسی پارامترهای ساخت کامپوزیت مولایت- آلومینا- کاربیدسیلیسیم به‌روش درجا توسط احیای کربوترمیک مواد آلومینوسیلیکاتی

نویسندگان

دانشکده مهندسی معدن و متالورژی، گروه مواد، دانشگاه یزد

چکیده

مولایت و آلومینا با ضریب انبساط گرمایی کم و مقاومت به شوک گرمایی خوب جزء سرامیک‌های دمابالا هستند. با وارد نمودن فاز تقویت کننده می‌توان از مزایای فاز سرامیکی چون استحکام گرم استفاده نمود. وجود کاربیدسیلیسیم در زمینه، خواص ترمومکانیکی را بهبود می‌بخشد. در فرایندهایی که به‌طور درجا فازهای موردنظر تشکیل می‌شود، هزینه‌ها کاهش می‌یابد. در این پژوهش از احیای کربوترمیک کائولینیت و آندالوزیت برای تشکیل کاربیدسیلیسیم به‌شکل درجا در زمینه آلومینا + مولایت استفاده شد. با توجه به نسبت (C/SiO2) و شرایط ساخت، ویژگی‌های کامپوزیت از نظر ترکیب فازی، ریزساختار و خواص فیزیکی و مکانیکی بررسی شد. نتایج نشان می‌دهد زمانی‌که نسبت C/SiO2 و دمای پخت در آندالوزیت 5/3 و 1600 درجه سانتی‌گراد و درکائولینیت 5/5 و 1550 درجه سانتی‌گراد باشد، شرایط بهینه‌ای از تراکم‌پذیری و تبلور فاز کاربیدسیلیسیم به­دست می­آید.

کلیدواژه‌ها


عنوان مقاله [English]

Fabrication of Mullite-Alumina-SiC Composites by In-Situ Reaction during Carbothermal Reduction of Inorganic Materials

نویسندگان [English]

  • P. Seifollahzadeh
  • M. Kalantar
  • M. Kalantar
  • A. Mashreghi
  • S.S. Ghasemi
Department of Materials Science and Engineering, Faculty of Mining and Materials Engineering,
چکیده [English]

Mullite and alumina are common in high-temperature applications because of their low thermal expansion coefficient and good thermal shock resistance. Evolution of SiC in the matrix and using it as reinforcing phase can improve thermo-mechanical properties of these materials. Also, in-situ formation of the reinforcing phases by using inorganic materials is an economical process. In this work, crystallization of SiC as reinforcing phase in the matrix of mullite-alumina by carbothermal reaction processes of inorganic materials (andalusite and kaolinite) was studied. According to the ratio of C/SiO2 and process conditions, some properties of the composite such as phase transformation, microstructure and physical and mechanical properties were investigated. The results showed that optimal ratio of C/SiO2 and firing temperature of densification to form SiC crystals were 3.5 and 1600°C for andalusite and 5.5 and 1500°C for kaolinite.

کلیدواژه‌ها [English]

  • Carbothermal Reduction
  • Andalusite
  • Kaolinite
  • Alumina
  • Mullite
  • SiC
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