Encapsulation of Reactive Ti2AlC and Nb2AlC Particles via a Boehmite Precipitation Route

Journal article
(Original article)


Publication Details

Author(s): Stumpf M, Köllner D, Biggemann J, Schüßler M, Greil P, Fey T
Journal: Advanced Engineering Materials
Publication year: 2019
Volume: 21
Journal issue: 6
ISSN: 1438-1656
Language: English


Abstract

Reactive Ti2AlC and Nb2AlC particles are encapsulated in a continuous boehmite shell by hydrolysis of ultrafine AlN powder in aqueous environment. The hydrolysis of AlN leads to the heterogeneous precipitation of nanolamellar boehmite on the surface of the Mn + 1AXn phase particles after 24 h reaction time. The boehmite coatings completely cover the MAX phase particles (Nb2AlC d50 = 7.9 μm; Ti2AlC d50 = 9.6 μm) with a thickness of 200 nm (Nb2AlC) and 135 nm (Ti2AlC). The lamellar structure of the boehmite coating is maintained after calcination at 400 °C in air, resulting in coatings with a maximum surface area of 41 m2 g−1 (Nb2AlC) and 50 m2 g−1 (Ti2AlC). The stability of the coating is assessed by using the coated Nb2AlC as particle filler in ZrO2. The coating is stable after the spark plasma sintering process and covers complex features of the particles. The present work shows the feasibility to encapsulate reactive MAX particles with a continuous oxide shell. The coated particles can be used as ductile crack bridging or healing filler in reactive matrixes requiring a spatial separation between filler and matrix. Higher surface charges by Al–O bonds on the surface facilitate the dispersion of the carbide particles in aqueous slurries.


FAU Authors / FAU Editors

Biggemann, Jonas
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Fey, Tobias Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Greil, Peter Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Köllner, David
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Schüßler, Martina
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Stumpf, Martin
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)


How to cite

APA:
Stumpf, M., Köllner, D., Biggemann, J., Schüßler, M., Greil, P., & Fey, T. (2019). Encapsulation of Reactive Ti2AlC and Nb2AlC Particles via a Boehmite Precipitation Route. Advanced Engineering Materials, 21(6). https://dx.doi.org/10.1002/adem.201900048

MLA:
Stumpf, Martin, et al. "Encapsulation of Reactive Ti2AlC and Nb2AlC Particles via a Boehmite Precipitation Route." Advanced Engineering Materials 21.6 (2019).

BibTeX: 

Last updated on 2019-19-06 at 19:38