skip to main content
DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

This content will become publicly available on November 29, 2020

Title: Thermophysical and mechanical property assessment of UB 2 and UB 4 sintered via spark plasma sintering

Abstract

Uranium diboride (UB 2) and uranium tetraboride (UB 4) are candidate constituents for multi-phase accident tolerant fuel due to their anticipated high thermal conductivity. These fuels have high uranium density that contributes to fission, and by tailoring the ratio of 10B/ 11B, can also act as an integrated burnable poison. Understanding the thermophysical and mechanical properties of uranium borides, for which only limited data are available in the literature, is of importance to determine their accident tolerance. In this work UB 2 and UB 4 have been synthesized via arc melting and sintered to high densities via spark plasma sintering (SPS). High density samples, >90% theoretical density, were used to measure the thermal diffusivity and thermal expansion of UB 2 and UB 4 and, in conjunction with specific heat literature data, their thermal conductivities were calculated from 298 to 1773 K. Additionally, resonance ultrasound spectroscopy (RUS) and nanoindentation were performed to investigate the mechanical properties of the uranium borides. Our results are discussed in the context of available literature. Both UB 2 and UB 4 exhibit thermal conductivities higher than that of UO 2, with UB 2 having the highest. The thermal conductivity of UB 2 increases with temperature abovemore » 874 K, while for UB 4 there is a linear increase over the entire measured range. X-ray diffraction (XRD) results indicate that impurity phases were present in the fabricated materials, which could explain why literature density functional theory (DFT) results predict higher values. As a result, this suggests that if impurity phases or any microstructural defects can be eliminated then the thermal conductivity can be further increased.« less

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [3];  [2]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Rensselaer Polytechnic Inst., Troy, NY (United States)
  3. Rensselaer Polytechnic Inst., Troy, NY (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1578026
Report Number(s):
LA-UR-19-25981
Journal ID: ISSN 0925-8388
Grant/Contract Number:  
89233218CNA000001; NE0008532
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 818; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Uranium borides; Advanced fuel phases; Thermal conductivity; Laser flash analysis; Resonance ultrasound spectroscopy; Nanoindentation

Citation Formats

Kardoulaki, Erofili, White, Joshua Taylor, Byler, Darrin David, Frazer, David Michael, Shivprasad, Aditya Prahlad, Saleh, Tarik A., Gong, Bowen, Yao, Tiankai, Lian, Jie, and McClellan, Kenneth James. Thermophysical and mechanical property assessment of UB2 and UB4 sintered via spark plasma sintering. United States: N. p., 2019. Web. doi:10.1016/j.jallcom.2019.153216.
Kardoulaki, Erofili, White, Joshua Taylor, Byler, Darrin David, Frazer, David Michael, Shivprasad, Aditya Prahlad, Saleh, Tarik A., Gong, Bowen, Yao, Tiankai, Lian, Jie, & McClellan, Kenneth James. Thermophysical and mechanical property assessment of UB2 and UB4 sintered via spark plasma sintering. United States. doi:10.1016/j.jallcom.2019.153216.
Kardoulaki, Erofili, White, Joshua Taylor, Byler, Darrin David, Frazer, David Michael, Shivprasad, Aditya Prahlad, Saleh, Tarik A., Gong, Bowen, Yao, Tiankai, Lian, Jie, and McClellan, Kenneth James. Fri . "Thermophysical and mechanical property assessment of UB2 and UB4 sintered via spark plasma sintering". United States. doi:10.1016/j.jallcom.2019.153216.
@article{osti_1578026,
title = {Thermophysical and mechanical property assessment of UB2 and UB4 sintered via spark plasma sintering},
author = {Kardoulaki, Erofili and White, Joshua Taylor and Byler, Darrin David and Frazer, David Michael and Shivprasad, Aditya Prahlad and Saleh, Tarik A. and Gong, Bowen and Yao, Tiankai and Lian, Jie and McClellan, Kenneth James},
abstractNote = {Uranium diboride (UB2) and uranium tetraboride (UB4) are candidate constituents for multi-phase accident tolerant fuel due to their anticipated high thermal conductivity. These fuels have high uranium density that contributes to fission, and by tailoring the ratio of 10B/11B, can also act as an integrated burnable poison. Understanding the thermophysical and mechanical properties of uranium borides, for which only limited data are available in the literature, is of importance to determine their accident tolerance. In this work UB2 and UB4 have been synthesized via arc melting and sintered to high densities via spark plasma sintering (SPS). High density samples, >90% theoretical density, were used to measure the thermal diffusivity and thermal expansion of UB2 and UB4 and, in conjunction with specific heat literature data, their thermal conductivities were calculated from 298 to 1773 K. Additionally, resonance ultrasound spectroscopy (RUS) and nanoindentation were performed to investigate the mechanical properties of the uranium borides. Our results are discussed in the context of available literature. Both UB2 and UB4 exhibit thermal conductivities higher than that of UO2, with UB2 having the highest. The thermal conductivity of UB2 increases with temperature above 874 K, while for UB4 there is a linear increase over the entire measured range. X-ray diffraction (XRD) results indicate that impurity phases were present in the fabricated materials, which could explain why literature density functional theory (DFT) results predict higher values. As a result, this suggests that if impurity phases or any microstructural defects can be eliminated then the thermal conductivity can be further increased.},
doi = {10.1016/j.jallcom.2019.153216},
journal = {Journal of Alloys and Compounds},
number = ,
volume = 818,
place = {United States},
year = {2019},
month = {11}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on November 29, 2020
Publisher's Version of Record

Save / Share: