Investigation of thermal transport in composites and ion beam irradiated materials for nuclear energy applications
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D.H. Hurley Department of Materials Science and Engineering, Idaho National Laboratory, Idaho Falls, Idaho 83415, USA (Received 1 July 2016; accepted 24 October 2016)
Thermal transport in materials used for energy applications is a physical process directly tied to performance and reliability. As a result, a great deal of effort has been devoted to understanding thermal transport in materials whose ability to conduct heat is critical. Here, our objective is to discuss the utility of laser-based thermoreflectance (TR) approaches that provide microscale measurement of thermal transport. We provide several examples that implement the TR technique to investigate thermal transport in materials used in nuclear energy applications. First, we discuss utility of this technique to measure thermal conductivity in ion irradiated ceramic materials during investigations where the primary objective is to understand the impact of radiation induced crystalline structure defects on thermal transport. We also present the capability of TR approach to resolve thermal conductivity of each layer in tristructural isotropic fuel, silicon carbide fiber composites, and 2nd phase precipitates in uranium silicide. Finally, the ability to measure interface thermal resistance between adjacent layers in composites is demonstrated. Dr. Marat Khafizov is an assistant professor in the Department of Mechanical and Aerospace Engineering at The Ohio State University (OSU). He obtained his Ph.D. degree in Physics from University of Rochester in 2008. Prior to joining OSU, he was a research scientist at Idaho National Laboratory (INL) from 2010 to 2014. At INL, he performed research aimed at understanding the impact of radiation damage on thermal transport in ceramic materials and was involved with development of laser based methods for characterization of material’s physical properties. Dr. Khafizov has an extensive experience in utilizing optical pump probe spectroscopy to study processes important for efficient energy utilization and information processing. He has applied this technique to study dynamics of excitons in carbon nanotubes, electron-hole recombination in semiconductors, superconducting state recovery, propagation of ultrasonic waves and phonon mediated thermal transport. His research findings have contributed to various technological applications including photovoltaics, information processing, radiation detection and nuclear energy. Currently, he is a director of Thermal Properties of Materials for Extreme Environments laboratory. M. Khafizov
I. INTRODUCTION
Safe and economic utilization of nuclear energy relies on accurate temperature control of various components within the reactor. A number of physical processes including rates of nuclear reactions, diffusion of fission products, and heat transfer are functions of temperature.1 Within a solid material, the temperature distribution depends on the ability of a material to conduct heat. Thermal conductivity is the physical property that is used to describe heat transport at the engineering scal
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