This study compares the microstructure of Al2O3 coatings produced by detonation gun spraying (DGS) and laser stereolithography (SLA). The SLA samples mostly consisted of alumina and voids, while the DGS-deposited alumina contained additional features such as splats, pores, cracks, and boundaries. DGS deposits were also denser with about 3% porosity compared to 8% porosity in the SLA samples. EDS analysis showed that both coatings contained only aluminum and oxygen, although additional carbon was detected in the SLA samples, indicating the presence of residual binder (resin based) material. XRD analysis revealed a mixture of α and γ-Al2O3 phases in the DGS coatings, but no phase change in the SLA samples.

alumina coatings, detonation gun spraying, laser stereolithography, microstructure, phase composition, porosity
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Copyright © 2019 ASM International. All rights reserved.
2019
ASM International
Topics
Microstructure Alumina ceramics Stereolithography Detonation gun spraying Chemical composition Porosity
Issue Section:
Other Additive Manufacturing
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