Thermal properties of a reaction hot pressed Mo≤5Si3C≤1 ceramic

Andrew A. Buchheit; William G. Fahrenholtz; Greg E. Hilmas; Doug M. Deason; H. Wang

doi:10.1016/j.intermet.2008.04.021

Thermal properties of a reaction hot pressed Mo_≤5Si₃C_≤1 ceramic

Andrew A. Buchheit, William G. Fahrenholtz, Greg E. Hilmas, Doug M. Deason, H. Wang

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

Mo_≤5Si₃C_≤1 was produced via reaction hot pressing. X-ray diffraction analysis revealed c-axis crystallographic orientation in the hot pressing direction. The orientation, combined with the inherent thermal expansion anisotropy of the structure, led to preferential microcracking and an overall anisotropic thermal expansion in hot pressed ceramics. Thermal conductivity was calculated for temperatures ranging from -120 to 500 °C from measured heat capacity and thermal diffusivity. Over that range, thermal conductivity increased from ∼9.5 to ∼21.5 W/m K. Electrical resistivity measurements allowed the separation of electrical and phononic contributions and revealed that the thermal conductivity of Mo_≤5Si₃C_≤1 was dominated by electron transport.

Original language	English
Pages (from-to)	1047-1052
Number of pages	6
Journal	Intermetallics
Volume	16
Issue number	9
DOIs	https://doi.org/10.1016/j.intermet.2008.04.021
State	Published - Sep 2008
Externally published	Yes

Funding

This work was supported by the Army Space and Missile Defense Command under grant number BAA DASG60-00-0005 and in part by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies as part of the High Temperature Materials Laboratory User Program at Oak Ridge National Laboratory managed by the UT-Battelle LLC, for the Department of Energy under contract DE-AC05000OR22725. Financial support for A. Buchheit was provided by the Department of Education under the Graduate Assistance in Areas of National Need (GAANN) Fellowship. The authors would also like to thank Ms. Jennifer Gilmore for technical assistance.

Funders	Funder number
Department of Education
Office of Transportation Technologies
UT-Battelle LLC
U.S. Department of Energy	DE-AC05000OR22725
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory
Space and Missile Defense Command	BAA DASG60-00-0005

Keywords

A. Molybdenum silicides
B. Thermal properties
C. Reaction synthesis

Access to Document

10.1016/j.intermet.2008.04.021

Cite this

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title = "Thermal properties of a reaction hot pressed Mo≤5Si3C≤1 ceramic",

abstract = "Mo≤5Si3C≤1 was produced via reaction hot pressing. X-ray diffraction analysis revealed c-axis crystallographic orientation in the hot pressing direction. The orientation, combined with the inherent thermal expansion anisotropy of the structure, led to preferential microcracking and an overall anisotropic thermal expansion in hot pressed ceramics. Thermal conductivity was calculated for temperatures ranging from -120 to 500 °C from measured heat capacity and thermal diffusivity. Over that range, thermal conductivity increased from ∼9.5 to ∼21.5 W/m K. Electrical resistivity measurements allowed the separation of electrical and phononic contributions and revealed that the thermal conductivity of Mo≤5Si3C≤1 was dominated by electron transport.",

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year = "2008",

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AU - Buchheit, Andrew A.

AU - Fahrenholtz, William G.

AU - Hilmas, Greg E.

AU - Deason, Doug M.

AU - Wang, H.

PY - 2008/9

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N2 - Mo≤5Si3C≤1 was produced via reaction hot pressing. X-ray diffraction analysis revealed c-axis crystallographic orientation in the hot pressing direction. The orientation, combined with the inherent thermal expansion anisotropy of the structure, led to preferential microcracking and an overall anisotropic thermal expansion in hot pressed ceramics. Thermal conductivity was calculated for temperatures ranging from -120 to 500 °C from measured heat capacity and thermal diffusivity. Over that range, thermal conductivity increased from ∼9.5 to ∼21.5 W/m K. Electrical resistivity measurements allowed the separation of electrical and phononic contributions and revealed that the thermal conductivity of Mo≤5Si3C≤1 was dominated by electron transport.

AB - Mo≤5Si3C≤1 was produced via reaction hot pressing. X-ray diffraction analysis revealed c-axis crystallographic orientation in the hot pressing direction. The orientation, combined with the inherent thermal expansion anisotropy of the structure, led to preferential microcracking and an overall anisotropic thermal expansion in hot pressed ceramics. Thermal conductivity was calculated for temperatures ranging from -120 to 500 °C from measured heat capacity and thermal diffusivity. Over that range, thermal conductivity increased from ∼9.5 to ∼21.5 W/m K. Electrical resistivity measurements allowed the separation of electrical and phononic contributions and revealed that the thermal conductivity of Mo≤5Si3C≤1 was dominated by electron transport.

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