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 not, vert, similar9.5 to not, vert, similar21.5 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.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Department of Education
United States. Department of Energy
U.S. Army Space and Missile Defense Command

Keywords and Phrases

Molybdenum Silicides; Reaction Synthesis; Thermal Properties

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2008 Elsevier, All rights reserved.

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