Synthesis of multi-hierarchical structured yttria-stabilized zirconia powders and their enhanced thermophysical properties

Journal Article · Sat Jun 01 04:00:00 EDT 2013 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.03.022· OSTI ID:22306351

Cao, Fengmei ^[1]; Gao, Yanfeng ^[1]; Chen, Hongfei ^[2]; Liu, Xinling; Tang, Xiaoping ^[1]; Luo, Hongjie ^[2]

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1. Shanghai Institute of Ceramics (SIC), Chinese Academy of Sciences (CAS), Dingxi 1295, Changning, Shanghai 200050 (China)
2. School of Materials Science and Engineering, Shanghai University, Shangda Rd. 99, Baoshan, Shanghai 200444 (China)

Multi-hierarchical structured yttria-stabilized zirconia (YSZ) powders were successfully synthesized by a hydrothermal-calcination process. The morphology, crystallinity, and microstructure of the products were characterized by SEM, XRD, TEM, and BET. A possible formation mechanism of the unique structure formed during hydrothermal processing was also investigated. The measured thermophysical results indicated that the prepared YSZ powders had a low thermal conductivity (0.63–1.27 W m⁻¹ K⁻¹), good short-term high-temperature stability up to 1300 °C. The influence of the morphology and microstructure on their thermophysical properties was briefly discussed. The unique multi-hierarchical structure makes the prepared YSZ powders candidates for use in enhanced applications involving thermal barrier coatings. - Graphical abstract: There are many tiny pores and grain boundaries in the multi-hierarchical structured yttria-stabilized zirconia (YSZ) powders,which greatly decrease the thermal conductivities of the YSZ powders. - Highlights: • Multi-hierarchical structured YSZ powders were successfully prepared. • The prepared YSZ powders had a low thermal conductivity (0.63–1.27 W m⁻¹ K⁻¹). • Improved high-temperature stability had been achieved for the prepared YSZ powders. • The influence of the morphology on their thermophysical properties was explored.

• OSTI ID: 22306351
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Vol. 202; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CALCINATION
GRAIN BOUNDARIES
POWDERS
SCANNING ELECTRON MICROSCOPY
SYNTHESIS
THERMAL CONDUCTIVITY
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES