High temperature thermophysical properties of spark plasma sintered tungsten carbide

Fast Breeder Test Reactor (FBTR) is a unique Indian fast reactor and irradiation facility for materials testing. As a part of its life extension activities, high density tungsten mono carbide (alpha-WC) is considered as a candidate material for the lower axial neutron shielding of the grid plate. Spark plasma sintering technique is used to synthesize high density (99.5%) tungsten carbide pellets under optimized conditions without a binder phase and subjected to high temperature thermal property characterization. The dilatational strain, thermal diffusivity as well as the resonance frequency of flexural vibration is measured as a function of temperature and the corre-sponding values of linear thermal expansion, thermal conductivity and the dynamic Young's modulus are esti-mated. The measured values are analyzed in combination with quasi-harmonic Debye-Gruneisen model to obtain a comprehensive database on vibrational thermodynamic properties from 0 to 1273 K. The observed Debye temperature for tungsten carbide under ambient conditions is 630 K which gradually decreases to 586 K at 1273 K. The estimated thermal Gruneisen parameter varied in the range of 1.41-1.45.

Automated summary

The study successfully synthesized high-density tungsten carbide pellets using spark plasma sintering technique and characterized their thermal properties. By measuring and analyzing the experimental data, a comprehensive database on vibrational thermodynamic properties from 0 to 1273 K was obtained. The values of thermal expansion, thermal conductivity, and dynamic Young's modulus of tungsten carbide varied with temperature.