Abstract
We report on a rapid sintering protocol, which optimizes the preparation of 0-29 mol% Gd-doped ceria ceramics with density ≥98% of the theoretical crystal lattice value. The starting material is a nanometer grain-sized powder prepared by carbonate co-precipitation and calcined with minimal agglomeration and loss of surface area. Slow (5°C/min) heating of the green-body from 500°C to the optimum temperature of rapid sintering (T1opt, dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. T1opt increases from 1300 to ~1500°C with increase in Gd-content, while the average grain size in the maximally dense pellets, as determined by scanning electron microscopy, ranges between 600 nm and ~1 μm. For each doping level, the logarithm of the average grain size decreases linearly with 1/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.
| Original language | English |
|---|---|
| Journal | Journal of the American Ceramic Society |
| DOIs | |
| Publication status | Accepted/In press - Jan 1 2018 |
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Keywords
- Ceramics
- Ceria
- Nanometric powder
- Pores
- Sintering
ASJC Scopus subject areas
- Ceramics and Composites
- Geology
- Geochemistry and Petrology
- Materials Chemistry
Cite this
Rapid sintering protocol produces dense ceria-based ceramics. / Yavo, Nimrod; Nissenbaum, Asaf; Wachtel, Ellen; Shaul, Tal El; Mendelson, Orit; Kimmel, Giora; Kim, Sangtae; Lubomirsky, Igor; Yeheskel, Ori.
In: Journal of the American Ceramic Society, 01.01.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Rapid sintering protocol produces dense ceria-based ceramics
AU - Yavo, Nimrod
AU - Nissenbaum, Asaf
AU - Wachtel, Ellen
AU - Shaul, Tal El
AU - Mendelson, Orit
AU - Kimmel, Giora
AU - Kim, Sangtae
AU - Lubomirsky, Igor
AU - Yeheskel, Ori
PY - 2018/1/1
Y1 - 2018/1/1
N2 - We report on a rapid sintering protocol, which optimizes the preparation of 0-29 mol% Gd-doped ceria ceramics with density ≥98% of the theoretical crystal lattice value. The starting material is a nanometer grain-sized powder prepared by carbonate co-precipitation and calcined with minimal agglomeration and loss of surface area. Slow (5°C/min) heating of the green-body from 500°C to the optimum temperature of rapid sintering (T1opt, dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. T1opt increases from 1300 to ~1500°C with increase in Gd-content, while the average grain size in the maximally dense pellets, as determined by scanning electron microscopy, ranges between 600 nm and ~1 μm. For each doping level, the logarithm of the average grain size decreases linearly with 1/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.
AB - We report on a rapid sintering protocol, which optimizes the preparation of 0-29 mol% Gd-doped ceria ceramics with density ≥98% of the theoretical crystal lattice value. The starting material is a nanometer grain-sized powder prepared by carbonate co-precipitation and calcined with minimal agglomeration and loss of surface area. Slow (5°C/min) heating of the green-body from 500°C to the optimum temperature of rapid sintering (T1opt, dwell time <1 minute) followed by 20°C/min cooling to 1150°C with 6 minutes dwell time, produces maximum pellet density. T1opt increases from 1300 to ~1500°C with increase in Gd-content, while the average grain size in the maximally dense pellets, as determined by scanning electron microscopy, ranges between 600 nm and ~1 μm. For each doping level, the logarithm of the average grain size decreases linearly with 1/T1. By avoiding extended exposure to sintering temperatures, this protocol is expected to minimize undesirable Gd segregation.
KW - Ceramics
KW - Ceria
KW - Nanometric powder
KW - Pores
KW - Sintering
UR - http://www.scopus.com/inward/record.url?scp=85047659748&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85047659748&partnerID=8YFLogxK
U2 - 10.1111/jace.15743
DO - 10.1111/jace.15743
M3 - Article
AN - SCOPUS:85047659748
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
SN - 0002-7820
ER -