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Title: Controlled relative humidity storage for high toughness and strength of binderless green pellets

Here, an equation was developed to predict fracture toughness of green powder compacts. The model combines crack tip toughness predicted by Kendall's model with crack tip shielding due to bridging of moisture meniscuses across the crack. The model predicts that crack tip shielding due to moisture should be dominant. Fracture tests on ceria green pellets verified that storing pellets at a high relative humidity (98% RH) for an extended period of time led to fracture strength more than double those stored at lower RH. However, at lower RH there is no significant increase in fracture strength with increased RH as predicted by the model. The lower strength at low RH is due to insufficient capillary and surface forces but may also be related to the lack of sufficient adsorbed moisture to form bridging meniscuses. The high green strengths achieved by storing pellets at a high RH suggest a method of strengthening green parts without adding binder.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  2. Boise State Univ., ID (United States). Center for Advanced Energy Studies
Publication Date:
Report Number(s):
INL/JOU-14-33000
Journal ID: ISSN 0002-7820
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Volume: 100; Journal Issue: 10; Journal ID: ISSN 0002-7820
Publisher:
American Ceramic Society
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 36 MATERIALS SCIENCE; Fracture toughness; green powder compacts; surrogate nuclear fuel; absorption/absorbents; green body; pressing; strength; toughness
OSTI Identifier:
1398255

Cannon, W. Roger, Hoggan, Rita E., Erickson, Arnold, Forsmann, Bryan, O'Brien, Robert C., and Lessing, Paul A.. Controlled relative humidity storage for high toughness and strength of binderless green pellets. United States: N. p., Web. doi:10.1111/jace.14982.
Cannon, W. Roger, Hoggan, Rita E., Erickson, Arnold, Forsmann, Bryan, O'Brien, Robert C., & Lessing, Paul A.. Controlled relative humidity storage for high toughness and strength of binderless green pellets. United States. doi:10.1111/jace.14982.
Cannon, W. Roger, Hoggan, Rita E., Erickson, Arnold, Forsmann, Bryan, O'Brien, Robert C., and Lessing, Paul A.. 2017. "Controlled relative humidity storage for high toughness and strength of binderless green pellets". United States. doi:10.1111/jace.14982. https://www.osti.gov/servlets/purl/1398255.
@article{osti_1398255,
title = {Controlled relative humidity storage for high toughness and strength of binderless green pellets},
author = {Cannon, W. Roger and Hoggan, Rita E. and Erickson, Arnold and Forsmann, Bryan and O'Brien, Robert C. and Lessing, Paul A.},
abstractNote = {Here, an equation was developed to predict fracture toughness of green powder compacts. The model combines crack tip toughness predicted by Kendall's model with crack tip shielding due to bridging of moisture meniscuses across the crack. The model predicts that crack tip shielding due to moisture should be dominant. Fracture tests on ceria green pellets verified that storing pellets at a high relative humidity (98% RH) for an extended period of time led to fracture strength more than double those stored at lower RH. However, at lower RH there is no significant increase in fracture strength with increased RH as predicted by the model. The lower strength at low RH is due to insufficient capillary and surface forces but may also be related to the lack of sufficient adsorbed moisture to form bridging meniscuses. The high green strengths achieved by storing pellets at a high RH suggest a method of strengthening green parts without adding binder.},
doi = {10.1111/jace.14982},
journal = {Journal of the American Ceramic Society},
number = 10,
volume = 100,
place = {United States},
year = {2017},
month = {5}
}