Journal
MATERIALS
Volume 14, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ma14164548
Keywords
aerosol deposition; multilayers; interdigitated aluminium electrodes; alumina insulating layers
Categories
Funding
- Jozef Stefan Institute Director's fund 2017-ULTRACOOL
- Slovenian Research Agency [N2-0212, PR-08977, Z2-9247, P2-0105]
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The preparation of metal-ceramic layered composites faces challenges due to material incompatibilities at high temperatures, which can increase production costs. However, using aerosol deposition (AD) to prepare multilayers is a simple, reliable, and cost-effective approach for substrate functionalization and protection.
The preparation of metal-ceramic layered composites remains a challenge due to the incompatibilities of the materials at the high temperatures of the co-firing process. For densification, the ceramic thick-film materials must be subjected to high-temperature annealing (usually above 900 degrees C), which can increase the production costs and limit the use of substrate or co-sintering materials with a low oxidation resistance and a low melting point, such as metals. To overcome these problems, the feasibility of preparing dense, defect-free, metal-ceramic multilayers with a room-temperature-based method should be investigated. In this study, we have shown that the preparation of ceramic-metal Al2O3/Al/Al2O3/Gd multilayers using aerosol deposition (AD) is feasible and represents a simple, reliable and cost-effective approach to substrate functionalisation and protection. Scanning electron microscopy of the multilayers showed that all the layers have a dense, defect-free microstructure and good intra-layer connectivity. The top Al2O3 dielectric layer provides excellent electrical resistance (i.e., 7.7 x 10(12) omega center dot m), which is required for reliable electric field applications.
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