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Title: Stability of rare‐earth‐doped spherical yttria‐stabilized zirconia synthesized by ultrasonic spray pyrolysis

Journal Article · · Journal of the American Ceramic Society
DOI:https://doi.org/10.1111/jace.14971· OSTI ID:1393681
 [1];  [1];  [2];  [2];  [3]; ORCiD logo [1]
  1. Department of Materials Science and Engineering &, NEAT ORU University of California‐Davis Davis California
  2. Institute of Physical Chemistry University of Hamburg Hamburg Germany
  3. Department of Chemical Engineering University of California‐Davis Davis California

Abstract Phase stability is one of the crucial requirements for any material that can be used at elevated temperature applications such as thermal barrier coating ( TBC ). The most traditional TBC material, partially stabilized zirconia, limits the operating temperature due to its phase transformation. Conversely, the low thermal conductivity of fully stabilized zirconia ( YSZ ) may enable effective reduction in the surface temperature on the coated component, while avoiding deleterious phase transitions, although still being subjected to sintering and grain growth. It has been reported that addition of rare‐earths as dopants to YSZ can significantly increase resistance to grain growth at high temperature. Keeping this under consideration, this work investigates the role of rare‐earths (lanthanum and gadolinium) in increasing thermal stability of YSZ microspheres, the building blocks for high‐temperature photonics for reflective TBC . The spheres were produced by ultrasonic spray pyrolysis, and the doping led to significant improvement of stability by significant inhibition of grain growth. While the individual dopants showed significant growth and sintering inhibition up to 900°C, co‐doping with 4% (in mol) of each (Gd and La) led to coarsening resistance up to 1000°C for 3 hours, when particles retained reasonable spherical features with nanometric crystallite sizes.

Sponsoring Organization:
USDOE
OSTI ID:
1393681
Journal Information:
Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Vol. 100 Journal Issue: 10; ISSN 0002-7820
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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