Tribological Properties of Combined Metal-Oxide–Ceramic Layers on Light Alloys

The influence of phase gradient within the micro arc oxidation (MAO) coatings on mechanical and tribological behaviors

“…[3][4] In general, the MAO coatings deposited on Al alloys predominantly contains -Al 2 O 3 , -Al 2 O 3 phases. [5][6][7][8][9][10] Interestingly, the ratio of -to -alumina is inversely proportional to the total concentration of residual Mg, Cu and Zn ions in the coatings. [11] Nevertheless, the hardest zone in the coating is typically located near the substrate-coating interface due to the presence of higher proportion of -Al 2 O 3 phase.…”

Improving the aluminum drill pipes stability by optimizing the shape of protector thickening

“…For the recovery of worn-out pipes it is advisable to use a dual-layer coating of the system "aluminum-aluminum oxide". The worn outer cylindrical surface of pipe made of aluminum alloy or steel is first coated with a layer of aluminum, and then its upper part is subjected to micro-arc oxidation for obtaining wear-resistant coating layer [13,14].…”

Gibbs energy calculation of electrolytic plasma channel with inclusions of copper and copper oxide with Al-base

“…However it is found that oxide-ceramic coating on the copper-doped alloy D16 have better physical and mechanical characteristics [5][6][7]. Analysis of the microstructure of these coatings revealed the presence of copper-containing inclusions of nanometer size [5].…”

“…Analysis of the microstructure of these coatings revealed the presence of copper-containing inclusions of nanometer size [5]. Conventional models, representing the processes of plasma electrolytic processing, claim that in spark channels only the reactions of oxidation of the alloying elements, available in the initial alloy, take place.…”