DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Microstructure characterization of electric field assisted sintering (EFAS) sintered metallic and ceramic materials using local thermal diffusivity measurement

Journal Article · · AIP Advances
DOI: https://doi.org/10.1063/5.0160625 · OSTI ID:2208843

Electric Field Assisted Sintering (EFAS, also referred to as spark plasma sintering) is a powerful technology for the consolidation of powder materials. The high heating rate during the sintering process is critical for minimizing energy consumption, but it can also cause microstructure heterogeneities in sintered parts, such as spatially varied porosity. The examination of localized porosity usually requires the use of a scanning electron microscope with a carefully prepared surface. In this paper, photothermal radiometry is used to measure local thermal diffusivity and extract localized porosity of EFAS-sintered parts by using a percolation-threshold model. Applying this approach, we identified the radial position-dependent porosity variation in EFAS parts, which is likely formed due to the large temperature gradient during the sintering process. This approach has a unique advantage because it can measure samples with minimal or no surface preparation, enabling the possibility of in situ characterization in EFAS with proper system modification. Necessary modifications on the measurement approach for EFAS deployment and in situ characterization are also discussed.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
2208843
Report Number(s):
INL/JOU--22-70215-Rev000
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 9 Vol. 13; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (39)

Influence of the Total Porosity on the Properties of Sintered Materials—A Review journal April 2021
Impact of Thermal Diffusion on Densification During SPS journal January 2009
Thermal Energy Transport in Oxide Nuclear Fuel journal December 2021
Characterization of Kapitza resistances of natural grain boundaries in cerium oxide journal March 2019
Analysis and modeling of the pore size effect on the thermal conductivity of alumina foams for high temperature applications journal November 2017
Thermal conductivities of actinides (U, Pu, Np, Cm, Am) and uranium-alloys (U–Zr, U–Pu–Zr and U–Pu–TRU–Zr) journal February 2014
The coupled influence of sample heating and diffraction on thermal diffusivity estimate with infrared photothermal microscopy journal July 1998
Thermal conductivity profile determination in proton-irradiated ZrC by spatial and frequency scanning thermal wave methods journal October 2013
The influence of lattice defects, recombination, and clustering on thermal transport in single crystal thorium dioxide journal November 2020
Local measurement of bulk thermal diffusivity using photothermal radiometry journal April 2022
Intrinsically Low Thermal Conductivity and High Carrier Mobility in Dual Topological Quantum Material, n‐Type BiTe journal February 2020
Techniques for Mitigating Thermal Fatigue Degradation, Controlling Efficiency, and Extending Lifetime in a ZnO Thermoelectric Using Grain Size Gradient FGMs journal October 2017
Thermal Conductivity in Nanocrystalline Ceria Thin Films journal December 2013
Effects of pore structure on thermal conductivity and strength of alumina porous ceramics using carbon black as pore-forming agent journal May 2016
Improvement in the thermoelectric properties of porous networked Al-doped ZnO nanostructured materials synthesized via an alternative interfacial reaction and low-pressure SPS processing journal January 2020
Optimal sintering parameters for Al2O3 optoceramics with high transparency by spark plasma sintering journal March 2016
The influence of pore size distribution on thermal conductivity, permeability, and phase change behavior of hierarchical porous materials journal October 2021
Three‐dimensional photothermal radiometry for the determination of the thermal diffusivity of solids journal June 1995
Estimation of Porosity and Pore size distribution from Scanning Electron Microscope image data of Shale samples: A case study on Jhuran formation of Kachchh Basin, India. journal November 2019
Thermal diffusivity measurement of focused-ion-beam fabricated sample using photothermal reflectance technique journal May 2017
Thermal wave propagation in thin films on substrates journal November 1995
Porous alumina and zirconia ceramics with tailored thermal conductivity journal November 2012
Influence of the heating rate on grain size of alumina ceramics prepared via spark plasma sintering (SPS) journal August 2020
A new percolation-threshold relation for the porosity dependence of thermal conductivity journal January 2006
A combined theoretical-experimental investigation of thermal transport in low-dose irradiated thorium dioxide journal December 2022
Indirect characterization of point defects in proton irradiated ceria journal March 2021
Effects of Grain Size and Texture on Thermal Conductivity of AZ31 during Static Recrystallization journal January 2017
Spatially localized measurement of thermal conductivity using a hybrid photothermal technique journal May 2012
Measurement of the Kapitza resistance across a bicrystal interface journal April 2011
An integrated experimental and computational investigation of defect and microstructural effects on thermal transport in thorium dioxide journal July 2021
Porosity dependence of thermal conductivity of ceramics and sedimentary rocks journal January 1993
Conductivity bounds for porous nuclear fuels journal February 1983
Relating phase transition heat capacity to thermal conductivity and effusivity in Cu 2 Se journal July 2016
Archimedes’ Principle Revisited journal January 2017
Impact of irradiation induced dislocation loops on thermal conductivity in ceramics journal June 2019
Issues and opportunities from Peltier effect in functionally-graded colusites: From SPS temperature modeling to enhanced thermoelectric performances journal March 2021
Two-step pulsed electric current sintering of transparent Al2O3ceramics journal December 2013
Spark Plasma Sintering of W–UO2 cermets journal February 2013
Spark plasma sintering of transparent alumina journal October 2007