Creating a Protective Shell for Reactive MoSi 2 Particles in High‐Temperature Ceramics
Abstract
Alumina encapsulated molybdenum silicide (MoSi 2 ) intermetallic particles were synthesized using a simple precipitation method followed by calcining at temperatures of 800°C–1000°C, to prevent the premature oxidation of MoSi 2 at high temperatures. The shell composition and the influence of the calcining temperature on microcapsule integrity were investigated by means of X‐ray photoelectron spectroscopy, X‐ray diffraction, scanning electron microscopy, and thermogravimetric analysis. The results demonstrate that the composition and the mechanical stability of the alumina shell can be tuned by the annealing temperature. After calcining at 800°C and 850°C the alumina shell remains intact. Calcining at higher temperature promotes the formation of mullite, which leads to cracking of the shell. However, when annealed at 1000°C for 24 h these cracks were filled with mullite and preserved the molybdenum silicide particles. Furthermore, the mechanical stability of the shell was improved by applying an intermediate calcining treatment at 450°C prior to the annealing process at 1000°C.
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In an extrinsic self-healing system, the healing process is typically activated by cracks that interact with the capsules.
“In an extrinsic system, the healing process is typically activated by cracks that interact with the capsules ( White et al., 2001; Kessler et al., 2003; Carabat et al., 2015 ).”
From A cohesive-zone crack healing model for self-healing materials (2018) · cites this paper as Carabat et al., 2015
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A cohesive-zone crack healing model for self-healing materials
Ponnusami, S. A., Krishnasamy, J., Turteltaub, S., & van der Zwaag, S. (2018) · International Journal of Solids and Structures · doi:10.1016/j.ijsolstr.2017.11.004 · Cited by 63 · see citing works
Self-citation
- Authors
- Carabat, A. L., van der Zwaag, S., & Sloof, W. G.
- Affiliations
- Delft University of Technology (NL)
- Faculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 Delft 2629 HS The Netherlands
- Corresponding author
- Carabat, Alexandra L.
- ORCID
- Sloof, Willem G.
- Venue
- Journal of the American Ceramic Society
- Publisher
- Wiley
- Published
- 2015-05-09
- Volume
- 98
- Issue
- 8
- Pages
- 2609-2616
- ISSN
- 0002-7820 (ISSN-L)
- 1551-2916
- OpenAlex
- W2109768606
- Cited by
- 29
- References
- 40
- Citations by year
- 2026: 2 · 2025: 1 · 2022: 4 · 2021: 2 · 2020: 3 · 2019: 7 · 2018: 6 · 2017: 2 · 2016: 1 · 2015: 1
- FWCI
- 2.65
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of the American Ceramic Society (publishedVersion)
- Funders
- Seventh Framework Programme (309849)
- Topics
- Physical Sciences › Materials Science › Ceramics and Composites › Advanced ceramic materials synthesis
- Physical Sciences › Engineering › Aerospace Engineering › High-Temperature Coating Behaviors
- Physical Sciences › Engineering › Mechanical Engineering › Intermetallics and Advanced Alloy Properties
- Keywords
- molybdenum silicide, protective shell, oxidation resistance, precipitation synthesis, calcination temperature, mullite formation, shell cracking, mechanical stability, high-temperature ceramics, intermetallic particles
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