Oxide Layer Formation by Micro-Arc Oxidation on Structurally Modified Al-Si Alloys and Applications for Large-Sized Articles Manufacturing

Mikhail M. Krishtal

doi:10.4028/www.scientific.net/AMR.59.204

Paper Titles

The Effects of Different Architectures on Thermal Fatigue in Particle Reinforced MMC for Heat Sink Applications
p.177

Preparation of Functionally Graded W/Cu Interlayers and Brazing to CuCrZr and CFC for Actively Cooled Flat Tile Divertor Mock-Ups
p.185

Brazing Technology for Plasma Facing Components in Nuclear Fusion Applications Using Low and Graded CTE Interlayers
p.192

Stress State, Texture, Phase and Morphology Analysis of Thin Graded W/Cu Coatings on Tungsten and their Thermal Behaviour in Fusion Application
p.198

Oxide Layer Formation by Micro-Arc Oxidation on Structurally Modified Al-Si Alloys and Applications for Large-Sized Articles Manufacturing
p.204

Graphite-Nimonic Alloy Brazing
p.209

Interface Design in Copper-Diamond Composite by Using PVD and CVD Coated Diamonds
p.214

Nanocomposite Coatings Produced by Friction Cladding
p.220

Joining of Superalloys to Intermetallics Using Nanolayers
p.225

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Oxide Layer Formation by Micro-Arc Oxidation on Structurally Modified Al-Si Alloys and Applications for Large-Sized Articles Manufacturing

Abstract:

The effect of the shape, size and kind of distribution of the silicon inclusions in Al-Si alloys of hypoeutectic, eutectic, and hypereutectic compositions (6–22 % Si) on the quality of oxide layer formed by micro-arc oxidation (MAO) is studied. The hitherto unknown phenomenon of oxide layer growth inhibition by the silicon particles under MAO is discovered and researched. The filling of near-surface pores by oxidation products in MAO process is observed also. The discovered ability to increase the properties of oxide layers obtained by the MAO due to prior directed modifica¬tion of the initial structure provides the good quality of oxide layers for aluminium alloys with high level of silicon content up to hypereutectic compositions of Al-Si alloys. The physical opportunity to get the high quality oxidized layers by MAO on structurally modified Al-Si alloys is confirmed for large-sized Al-Si alloys castings (including cylinder block for engine).