Effect of C۳N۴ content on the densification and mechanical characteristics of spark plasma sintered ZrB۲ ceramics
سال انتشار: 1401
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 220
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شناسه ملی سند علمی:
ICC13_092
تاریخ نمایه سازی: 30 آبان 1401
چکیده مقاله:
In this research, ZrB۲ ceramic containing ۲.۵ and ۷.۵ wt% C۳N۴ were manufactured by spark plasma sintering(SPS) at ۱۸۵۰ ºC for ۶ min under ۴۰ MPa. The effect of C۳N۴ content as a sintering aid on microstructuralrefinement and mechanical properties (Vickers hardness, fracture toughness, and bending strength) of SPSedZrB۲ was investigated. Near fully dense sample with relative density of ۹۹.۹ was achieved by addition of ۷.۵wt% C۳N۴. The grain growth of ZrB۲ was restricted by increasing in C۳N۴ content. Vickers hardness andfracture toughness increased from ۱۵.۲ and ۳.۲ to ۱۶.۶ GPa and ۵ MPa.m۱/۲,when C۳N۴ content increasedfrom ۲.۵ to ۷.۵ wt%, respectively, but bending strength decreased from ۴۴۵.۶ to ۴۰۰ MPa. The in-situformation of ZrC and h-BN led to enhancement of fracture toughness through activating various tougheningmechanisms including crack bridging, crack branching, and crack deflection.
کلیدواژه ها:
نویسندگان
Zohre Ahmadi
Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran
Mehdi Shahedi Asl
Department of Mechanical Engineering, Faculty of Engineering, University of Kyrenia, Kyrenia, Mersin ۱۰,Turkey
Mohammad Zakeri
Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran
Mohammad Farvizi
Ceramic Department, Materials and Energy Research Center (MERC), Karaj, Iran