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Characterization of Alumina-Titania Coatings Produced by Atmospheric Plasma Spraying on 304 SS Steel

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Djendel M., Allaoui O., Boubaaya R.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 3
538-540
EN
The alumina-titania coatings produced by atmospheric plasma spraying are being developed for a wide variety of applications that require resistance to wear, erosion, cracking, and spallation. Consideration of parameters setting will develop reliable coatings with high performance properties for demanding coating application. Al₂O₃-3 wt% TiO₂ was used as the main coating. Ni 20%Cr₆Al powder was used as bond coat coating onto AISI 304 stainless steel substrate using Sulzer-Metco plasma spray system 9MC equipment.
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Production of Chromium Boride Layers on Carbon Steel with Conversion Treatment: Chromium Deposition + Diffusion Annealing

100%
Boubaaya R., Benarioua Y., Allaoui O., Djendel M.
Acta Physica Polonica A
|
2017
|
vol. 132
|
issue 3
541-543
EN
The present study has been conducted in order to obtaining chromium boride layers on carbon steel using a conversion processing comprising the following steps: boriding treatment in order to increase the amount of boron atoms in the steel surface, deposition of a thin layer of pure chromium using electrolytic method, and finally an annealing treatment for boron diffusion and formation of boride layer until complete transformation of chromium layer. Depending on the method used (chromium deposition followed by boriding or boriding followed by chromium deposition) and the holding time, the partial or complete conversion is obtained as a result of the diffusion process. The role of the annealing temperature on transformation rates of chromium into chromium boride films was investigated. It is shown that for 1 h at 900°C, the chromium layer is totally transformed. The scanning electron microscopy analysis and X-ray diffraction showed the presence of CrB and CrB₂ chromium borides in addition of FeB and Fe₂B iron borides.
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