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http://dx.doi.org/10.7234/composres.2015.28.6.366

High Temperature Thermo-mechanical Properties of HfC Reinforced Tungsten Matrix Composites  

Umer, Malik Adeel (School of Chemical and Materials Engineering, National University of Science and Technology)
Lee, Dong Ju (Division of Nuclear Materials Development, Korea Atomic Energy Research Institute)
Ryu, Ho Jin (Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology)
Hong, Soon Hyung (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology)
Publication Information
Composites Research / v.28, no.6, 2015 , pp. 366-371 More about this Journal
Abstract
In order to improve the mechanical properties of tungsten at room and elevated temperature, hafnium carbide (HfC) reinforced tungsten matrix composites were prepared using the spark plasma sintering technique. The effect of HfC content on the compressive strength and flexural strength of the tungsten composites was investigated. Mechanical properties of the composites were also measured at elevated temperatures and their trends, with varying reinforcement volume fraction, were studied. The effect of reinforcement fraction on the thermal properties of the composites was investigated. The thermal conductivity and diffusivity of the composites decreased with increasing temperature and reinforcement volume fraction. An inherently low thermal conductivity of the reinforcement as well as interfacial losses was responsible for lower values of thermal conductivity of the composites. Values of coefficient of thermal expansion of the composites were observed to increase with HfC volume fraction.
Keywords
Tungsten; Metal matrix composites (MMCs); Microstructure; Mechanical properties; Thermal conductivity;
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