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

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14982· OSTI ID:1398255
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
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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.

Research Organization:
Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC07-05ID14517
OSTI ID:
1398255
Report Number(s):
INL/JOU-14-33000
Journal Information:
Journal of the American Ceramic Society, Vol. 100, Issue 10; ISSN 0002-7820
Publisher:
American Ceramic SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

References (13)

Crack Model for Toughness of Green Parts with Moisture or a Fluid Binder journal July 2012
Effect of Moisture on the Structure and Fracture Strength of Ceramic Green Bodies journal December 1994
A Theoretical Study of the Liquid Bridge Forces between Two Rigid Spherical Bodies journal November 1993
Fracture mechanics of green products journal January 1993
Dry bag isostatic pressing for improved green strength of surrogate nuclear fuel pellets journal November 2010
Formation mechanisms of processing defects and their relevance to the strength in alumina ceramics made by powder compaction process journal January 1999
Green strength testing of pressed compacts: An analysis of the different methods journal January 2008
Green strength of binder-free ceramics journal May 2013
Mechanical Properties of Dry-Pressed Ceramic Green Products: The Effect of the Binder journal August 1997
Effect of Relative Humidity on the Viscoelastic and Mechanical Properties of Spray-Dried Powder Compacts journal April 2006
Strength of Green Ceramics with Low Binder Content journal December 2001
Modeling Time-Dependent Forces on Liquid Bridge Interactions Between Dissimilar Particles journal January 2008
Mechanical Properties of Dry-Pressed Powder Compacts: Case Study on Alumina Nanoparticles journal August 2006

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Related Subjects

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