مروری بر تاثیر کمک‏ سینترهای اکسیدی بر رفتار سینترپذیری کامپوزیت‌های کاربید بور (B4C)

الموضوعات :

مهدی شکوری دیسفانی ¹ (دانشجوی کارشناسی ارشد مهندسی مواد مرکب، دانشگاه صنعتی مالک اشتر تهران)
مینا سعیدی حیدری ² (دانشجوی دکترای، دانشگاه آزاد اسلامی، واحد تهران جنوب، باشگاه پژوهشگران جوان و نخبگان،تهران)
حمید رضا بهاروندی ³ (دانشیار، مجتمع مواد و فناوری‌‌های ساخت، دانشگاه صنعتی مالک اشتر تهران)

تاريخ الإرسال : 15 الإثنين , رمضان, 1437 تاريخ التأكيد : 15 الإثنين , رمضان, 1437 تاريخ الإصدار : 14 السبت , شعبان, 1437

الکلمات المفتاحية: کاربید بور, چقرمگی شکست, افزودنی, خواص فیزیکی و مکانیکی, سینترپذیری,

ملخص المقالة :

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.

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