Spark Plasma Sintering of Ultra-High Temperature Tantalum/Hafnium Carbides Composite

سال انتشار: 1395
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 133

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شناسه ملی سند علمی:

JR_ACERPT-2-1_003

تاریخ نمایه سازی: 11 اردیبهشت 1400

چکیده مقاله:

TaC and HfC are thought to have the highest melting point (~۴۰۰۰°C) among all refractory materials. The binary solid solution of TaC and HfC (Ta۴HfC۵) is also considered as the most refractory material with the melting point over ۴۰۰۰ °C and valuable physical and mechanical properties. The main goal of this work is to fabricate TaC/HfCbased composites which consolidated by means of spark plasma sintering (SPS) with addition of MoSi۲ as sintering aid and carbon nanotubes (CNTs) as reinforcement at ۲۰۰۰ °C. The effects of additives were investigated in terms of densification, mechanical properties, phase and microstructural evolutions. It was demonstrated that the relative density could reach from ۹۴ % TD (for binder less sample) to near ۹۹ % for samples containing additives, respectively. The average Vickers hardness and fracture toughness values were in the range of ۱۶-۱۹ MPa and ۲.۹-۵.۳ MPa.m۱/۲. The samples containing CNTs showed improved fracture toughness and the survivability of CNTs, after spark plasma sintering, was proved by scanning electron microscopy of fractured surfaces in addition to the Raman spectroscopy analysis.

نویسندگان

Farzin Arianpour

School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST)

Farhad Golestani Fard

Materials and Metallurgical Engineering, Iran University of Science and Technology (IUST)

HamidReza Rezaie

School of Metallurgy and Material Engineering, Iran University of Science and Technology (IUST)