Abstract
In this study, Al-Al2O3 double-layer coating and Al-Al2O3 fusion coating were prepared on 316L stainless steel substrate by double target and double frequency magnetron sputtering. It was found that the Al/Al2O3 transition layer was formed between Al and Al2O3 by CO sputtering deposition, which effectively reduces the interlayer microstructure defects, and makes the Al-Al2O3 fusion coating have a denser interlayer structure than the Al-Al2O3 double-layer coating. The deuterium permeation test of the coating was carried out at 823–1023 K. The deuterium resistance reduction factor of Al-Al2O3 fusion coating was 8–72, which was 2–3 times that of Al-Al2O3 double-layer coating. The deuterium permeation diffusion time of Al-Al2O3 fusion coating was 1/10 of that of Al-Al2O3 double-layer coating. With the increase of penetration test temperature, it was found that the deuterium resistance reduction factor of Al-Al2O3 fusion coating increases significantly, which was because amorphous Al2O3 was transformed into more dense γ-Al2O3 in high temperature test.
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