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Updated: Jun 12, 2026
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Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures
Published on: November 7, 2016
Interactions between molten aluminum and Y2O3 studied with TEM techniques
J Wojewoda-Budka1, N Sobczak, J Morgiel
1Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Cracow, Poland. nmwojewo@imim-pan.krakow.pl
Journal of Microscopy
|May 27, 2010
Summary
High-temperature interaction between molten aluminum and yttria forms a millimeter-scale reaction layer. This layer exhibits a multilayer structure with distinct aluminum-yttrium-oxide phases and metallic channels.
Area of Science:
- Materials Science
- Ceramics Engineering
- High-Temperature Chemistry
Background:
- Molten aluminum-oxide interactions are critical in high-temperature processes.
- Understanding the reaction product layer is key to controlling material performance.
Purpose of the Study:
- To structurally characterize the reaction product region formed between molten aluminum and yttria at 1273 K.
- To identify the phases and microstructures within the reaction layer.
Main Methods:
- High-temperature interaction experiments (1273 K).
- Transmission electron microscopy (TEM).
- Focused ion beam (FIB) preparation technique.
Main Results:
- A wavy, multilayered reaction product region up to 1 mm thick was observed.
- Zone 1: Fine Al(5)Y(3)O(12) (YAG) precipitates surrounded by Al(3)Y.
- Zone 2: Larger AlYO(3) (YAP) crystals.
- Zone 3: YAP precipitates with Al(2)Y metallic channels (C4 microstructure).
Conclusions:
- The reaction between molten aluminum and yttria at high temperatures produces a complex, multi-phase reaction layer.
- The distinct layered structure and microstructural features (YAG, YAP, Al(2)Y) provide insights into the reaction mechanism.
