Pressureless sinterability study of ZrB۲–SiC composites containing hexagonal BN and phenolic resin additives
محل انتشار: فصلنامه سنتز و تفجوشی، دوره: 1، شماره: 2
سال انتشار: 1400
نوع سند: مقاله ژورنالی
زبان: فارسی
مشاهده: 164
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شناسه ملی سند علمی:
JR_SYNSINT-1-2_005
تاریخ نمایه سازی: 28 آذر 1400
چکیده مقاله:
This research is dedicated to investigating the role of different amounts of hexagonal BN (hBN: ۰, ۱.۵, ۳, and ۴.۵ wt%) on the pressureless sinterability of ZrB۲–۲۵ vol% SiC ceramics. Phenolic resin (۵ wt%) with a carbon yield of ~۴۰ % was incorporated as a binder to the powder mixtures and after initial cold pressing, the final sintering process was performed at ۱۹۰۰ °C for ۱۰۰ min in a vacuum furnace. The as-sintered specimens were characterized by X-ray diffractometry, field emission scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results disclosed that the incorporation of ۱.۵ wt% hBN could increase the relative density to ~۹۲%, while the sample with zero hBN content just reached ~۸۱% of full densification. Appropriate hBN content not only facilitated the particle rearrangement during the cold pressing, but also removed the harmful oxide impurities during the final sintering. Nevertheless, the addition of higher amounts of hBN remarkably lessened the densification because of more delamination of the non-reacted hBN flakes and release and entrapment of more gaseous by-products induced by the reacted hBN phases.
کلیدواژه ها:
نویسندگان
Iman FarahBakhsh
Department of Engineering & Technology, Southeast Missouri State University, Cape Girardeau, MO ۶۳۷۰۱, USA
Riccarda Antiochia
Department of Chemistry and Drug Technologies, Sapienza University of Rome, P.le Aldo Moro ۵, ۰۰۱۸۵ Rome, Italy
Ho Won Jang
Department of Materials Science and Engineering, Research Institute of Advanced Materials, Seoul National University, Seoul ۰۸۸۲۶, Republic of Korea