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Title: Characterization of ultralow thermal conductivity in anisotropic pyrolytic carbon coating for thermal management applications

Journal Article · · Carbon

Pyrolytic carbon (PyC) is an important material used in many applications including thermal management of electronic devices and structural stability of ceramic composites. Accurate measurement of physical properties of structures containing textured PyC layers with few-micrometer thickness poses new challenges. Here a laser-based thermoreflectance technique is used to measure thermal conductivity in a 30-μm-thick textured PyC layer deposited using chemical vapor deposition on the surface of spherical zirconia particles. Raman spectroscopy is used to confirm the graphitic nature and characterize microstructure of the deposited layer. Room temperature radial and circumferential thermal conductivities are found to be 0.28 W m–1 K–1 and 11.5 W m–1 K–1, corresponding to cross-plane and in-plane conductivities of graphite. While the anisotropic ratio of the in-plane to cross-plane conductivities is smaller than previous results, the magnitude of the smallest conductivity is noticeably smaller than previously reported values for carbon materials and offers opportunities in thermal management applications. Very low in-plane and cross-plane thermal conductivities are attributed to strong grain boundary scattering, high defect concentration, and small inter-laminar porosity. Lastly, experimental results agree with the prediction of thermal transport model informed by the microstructure information revealed by Raman spectroscopy.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-06NA25396; 20150058DR; DENE0000671; EE0007686
OSTI ID:
1415411
Alternate ID(s):
OSTI ID: 1576055
Report Number(s):
LA-UR-17-25392
Journal Information:
Carbon, Vol. 129, Issue C; ISSN 0008-6223
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (4)

Simultaneous characterization of cross- and in-plane thermal transport in insulator patterned by directionally aligned nano-channels journal January 2020
Impact of irradiation induced dislocation loops on thermal conductivity in ceramics journal June 2019
Thermal Conductivity of HfTe 5 : A Critical Revisit journal November 2019
Pyrolytic Carbon Coating Effects on Oxide and Carbide Kernels Intended for Nuclear Fuel Applications journal June 2019

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