Next Article in Journal
Influence of Fragment Size on the Time and Temperature of Ethylene Vinyl Acetate Lamination Decomposition in the Photovoltaic Module Recycling Process
Previous Article in Journal
Influence of the Ni/Co Mass Ratio on the Microstructure and Properties of Quaternary Cu-Ni-Co-Si Alloys
Open AccessArticle

Alumina-Doped Zirconia Submicro-Particles: Synthesis, Thermal Stability, and Microstructural Characterization

1
Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, 20146 Hamburg, Germany
2
Electron Microscopy Unit, Hamburg University of Technology, Eißendorfer Straße 42 (M), 21073 Hamburg, Germany
3
Institute of Advanced Ceramics, Hamburg University of Technology, Denickestraße 15 (K), 21073 Hamburg, Germany
4
Fraunhofer Center for Applied Nanotechnology CAN, Grindelallee 117, 20146 Hamburg, Germany
*
Author to whom correspondence should be addressed.
Current address: AB-Analytik Dr. A. Berg GmbH, Ruhrstraße 49, D-22761 Hamburg, Germany.
Materials 2019, 12(18), 2856; https://doi.org/10.3390/ma12182856
Received: 9 August 2019 / Revised: 29 August 2019 / Accepted: 3 September 2019 / Published: 5 September 2019
(This article belongs to the Section Structure Analysis and Characterization)
Zirconia nanoceramics are interesting materials for numerous high-temperature applications. Because their beneficial properties are mainly governed by the crystal and microstructure, it is essential to understand and control these features. The use of co-stabilizing agents in the sol-gel synthesis of zirconia submicro-particles should provide an effective tool for adjusting the particles’ size and shape. Furthermore, alumina-doping is expected to enhance the particles’ size and shape persistence at high temperatures, similar to what is observed in corresponding bulk ceramics. Dispersed alumina should inhibit grain growth by forming diffusion barriers, additionally impeding the martensitic phase transformation in zirconia grains. Here, alumina-doped zirconia particles with sphere-like shape and average diameters of 300 n m were synthesized using a modified sol-gel route employing icosanoic acid and hydroxypropyl cellulose as stabilizing agents. The particles were annealed at temperatures between 800 and 1200 C and characterized by electron microscopy, elemental analysis, and X-ray diffraction. Complementary elemental analyses confirmed the precise control over the alumina content (0–50 mol%) in the final product. Annealed alumina-doped particles showed more pronounced shape persistence after annealing at 1000 C than undoped particles. Quantitative phase analyses revealed an increased stabilization of the tetragonal/cubic zirconia phase and a reduced grain growth with increasing alumina content. Elemental mapping indicated pronounced alumina segregation near the grain boundaries during annealing. View Full-Text
Keywords: ceramic microparticles; alumina/zirconia; doping; sol-gel; thermal stability; phase transformation; grain growth ceramic microparticles; alumina/zirconia; doping; sol-gel; thermal stability; phase transformation; grain growth
Show Figures

Graphical abstract

MDPI and ACS Style

Dahl, G.T.; Döring, S.; Krekeler, T.; Janssen, R.; Ritter, M.; Weller, H.; Vossmeyer, T. Alumina-Doped Zirconia Submicro-Particles: Synthesis, Thermal Stability, and Microstructural Characterization. Materials 2019, 12, 2856.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop