مروری بر تاثیر کمک سینترهای اکسیدی بر رفتار سینترپذیری کامپوزیتهای کاربید بور (B4C)
محورهای موضوعی : عملیات حرارتیمهدی شکوری دیسفانی 1 , مینا سعیدی حیدری 2 , حمید رضا بهاروندی 3
1 - دانشجوی کارشناسی ارشد مهندسی مواد مرکب، دانشگاه صنعتی مالک اشتر تهران
2 - دانشجوی دکترای، دانشگاه آزاد اسلامی، واحد تهران جنوب، باشگاه پژوهشگران جوان و نخبگان،تهران
3 - دانشیار، مجتمع مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر تهران
کلید واژه: کاربید بور, چقرمگی شکست, افزودنی, خواص فیزیکی و مکانیکی, سینترپذیری,
چکیده مقاله :
کاربید بور به دلیل خواصی مانند سختی بالا، مدول یانگ بالا، وزن مخصوص پائین بسیار مورد توجه است، با این حال کاربرد آن به علت مشکل در زینتر پذیری، چقرمگی شکست پائین و مقاومت به اکسیداسیون کم در دماهایی بیشتر از 1000 درجه سانتیگراد، نسبتا محدود شده است. به دست آوردن کاربید بور با دانسیته بالا به وسیله روش های سینتر رایج بسیار مشکل و پر هزینه بوده که علت آن نقطه ذوب بالا، پیوندهای کوالانت، ضریب نفوذ در خود پائین و فشار بخار بالای آن میباشد. تحقیقات زیادی برای بهبود شرایط سینتر با روش های مختلف و استفاده از کمک زینتر های گوناگون صورت گرفته است. اغلب مشاهده شده که مقادیر کمی از اکسیدها در بهبود زینترینگ سرامیکهای غیر اکسیدی موثر بودهاند. در این مقاله اثر کمک سینتر های اکسیدی مختلف بر رفتار سینتر و خواص مکانیکی کاربید بور گزارش شده است.
Boron carbide because of properties such as high hardness, high Young's modulus and low density is highly regarded, however due to difficulties in sintering ability, low fracture toughness and low oxidation resistance at temperatures greater than 1000 ° C, its application is limited relatively. Obtaining a high-density boron carbide by conventional methods is very difficult and costly because of the high melting point, covalently bonded, its low self-diffusion and high vapor pressure. Many of researches have been done to improve the sintering condition by different methods and using various kinds of sintering aids. It is often observed that small amounts of oxides have been more effective on sintering improvement of non-oxidizing ceramics. In this paper, the effect of different oxidizing sintering aids has been reported on sintering behavior and mechanical properties of boron carbide.
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