Cold sintering of α-alumina using functionalized boehmite: A cost-effective approach to reduce sintering temperature

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abstract

A novel cold-assisted sintering process using a combination of functionalized boehmite and alpha-alumina particles is demonstrated. Functionalized boehmite and alpha-alumina composites were initially densified using a cold sintering process at <300 degrees C followed by heat treatment at 1400 degrees C-1450 degrees C (similar to 200 degrees C-300 degrees C lower than conventionally sintered alpha-alumina). Highest relative densities (99%) were achieved using meso-scale alpha-alumina (D (50) = 720 nm) in a 50:50 wt% mixture with boehmite, functionalized in 2 M acetic acid. The high densities at low temperature were attributed to easy propagation of the transformation to alpha phase within the dense boehmite matrix, accompanied by enhanced nucleation on the surface of the alumina particles. Critical aspects of the transformation sequence from functionalized boehmite to alpha-alumina were characterized using Raman and Fourier transform infrared spectroscopy. Preliminary hardness measurements were comparable with conventional alumina sintered at similar to 1650 degrees C and initial microwave measurements showed promise for the fabrication of high-temperature co-fired ceramic substrates in electronics.

keywords

GAMMA-ALUMINA; GREEN DENSITY; TRANSFORMATION; CERAMICS; RAMAN; PRECURSORS; ALUMOXANES; KINETICS; SPECTRA; CREEP

subject category

Materials Science

authors

Grimes, C; Button, CA; Zhao, A; Haigh, L; Almeida, B; Vilarinho, I; Costa, MEV; Mantheakis, E; Reaney, IM

our authors

foto Inês Lousada Silveirinha Borges Vilarinho

Inês Lousada Silveirinha Borges Vilarinho

Junior Researcher
foto Maria Elisabete Jorge Vieira Costa

Maria Elisabete Jorge Vieira Costa

Collaborator

Groups

G2 - Photonic, Electronic and Magnetic Materials
G4 - Renewable Materials and Circular Economy

Projects

CICECO - Aveiro Institute of Materials (UIDP/50011/2020)

Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)

acknowledgements

Engineering Physical Science Research Council grants, Grant/Award Number:EP/X016463/1; InnovateUK "Economizer"programme; CICECO-Aveiro Institute of Materials, Grant/Award Numbers:UIDB/50011/2020, UIDP/50011/2020,LA/P/0006/2020; FCT/MCTES(PIDDAC); Journal of European CeramicSociety Trust, Grant/Award Number:2022308r No Statement Availabler No Statement Availabler No Statement Availabler No Statement Available

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Publication Details

type
Journal Article
year
2025
journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
volume
108
article number
e70208
publisher
WILEY
issn
0002-7820
issue
12
digital object identifier
10.1111/jace.70208
web of science article identifier
WOS:001565106500001

Journal Metrics (JCR 2019)

Journal Impact Factor
3.502
Journal Impact Factor (5 yrs)
3.475
category normalized journal percentile
91.071

Citations

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