Effects of ThO2 on the solid-state sintering behavior of W–Ni–Fe alloy

Dilatometric analyses were employed to investigate the influence of ThO2 particles on the sintering behavior of W-Ni-Fe alloys up to 1450AC which is below the liquid formation temperature. The activation energies were obtained by analyzing by the shift of the iso-density points as a function of the...

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Bibliographic Details
Published in:International journal of refractory metals & hard materials 2011-01, Vol.29 (1), p.112-116
Main Authors: Kim, Youngmoo, Lee, Seong, Kim, Eun-Pyo, Noh, Joon-Woong
Format: Article
Language:English
Subjects:
Activation energy
Diffusion
Dilatometry
Liquids
Refractory metals
Sintering
Thorium dioxide
Tungsten base alloys
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Summary:Dilatometric analyses were employed to investigate the influence of ThO2 particles on the sintering behavior of W-Ni-Fe alloys up to 1450AC which is below the liquid formation temperature. The activation energies were obtained by analyzing by the shift of the iso-density points as a function of the linear-heating rate. It is well known that the dominant sintering mechanism of tungsten particles is grain-boundary diffusion in the solid-state. The activation energies were 304.00-467.39kJ/mol for W-Ni-Fe and 519.10-2949.60kJ/mol for the thoria doped alloy, respectively. The results for the non-added alloy are in agreement with the values reported in the literature. The possibility that the much higher energies for the doped alloy reflect a retardation of sintering due to the presence of thoria particles at the surface of the tungsten is discussed.
ISSN:0263-4368
DOI:10.1016/j.ijrmhm.2010.08.009