Sol–gel Al2O3/ZrO2 duplex films for protection of a γ-TiAl based alloy against high temperature oxidation

Production of Al2O3‐Stabilized Tetragonal ZrO2 Nanoparticles for Thermal Barrier Coating

“…Both surfaces of the specimen were polished with five different carbide sheets to obtain a smooth mirror‐like surface. Before start of a coating process, all polished plates were rinsed with acetone for 10 min under an ultrasonic bath followed by washing with double‐distilled water to remove the polished debris and metallic ions . The grade and elemental compositions of mild steel specimen were analyzed through the arc/spark optical emission spectroscopy (OES, ARL 4460; Thermo Scientific, East Grinstead, U.K.).…”

High Temperature Oxidation of ZrO<SUB>2</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB> Thin Films Deposited on Steel

“…In addition, high-temperature oxidation behavior of a Al 2 O 3 /ZrO 2 duplex film deposited on a TiAl alloy by sol-gel processing was previously studied. 8 The duplex film significantly increased the oxidation resistance of the TiAl alloy at 900 and 1000 C by restraining the growth of TiO 2 and increasing the growth of the Al 2 O 3 in the formed oxide scales. The aim of this study is to deposit a nano-multilayered ZrO 2 /Al 2 O 3 thin film on a tool steel by CAPD and investigate the kinetics and mechanism of oxidation in the temperature range of 600-900 C. While the effects of deposition parameters on microstructure, composition, wear, adhesion, and microhardness in ZrO 2 /Al 2 O 3 films deposited by CAPD were previously studied, [14][15][16] …”

“…Hence, efforts to synthesize ZrO 2 /Al 2 O 3 by various coating techniques such as thermal plasma spraying, 1-4 electron beam evaporation, 5 electrolytic deposition, 6 7 sol-gel processing, 8 chemical vapor deposition, 9 magnetron sputtering, [10][11][12] and cathodic arc plasma deposition (CAPD) [14][15][16] have been actively pursued. ZrO 2 /Al 2 O 3 coatings have been synthesized in the form of thermal barrier coatings (TBCs), 1-4 a single (Zr,Al)O layer, 5 double layers, 7 8 nanocomposites, [10][11][12] and multilayers.…”

“…ZrO 2 /Al 2 O 3 coatings have been synthesized in the form of thermal barrier coatings (TBCs), 1-4 a single (Zr,Al)O layer, 5 double layers, 7 8 nanocomposites, [10][11][12] and multilayers. 6 9 13-17 The substrates that have been used include Ni alloys, 1 4 13 steels, 2 3 6 7 15 TiAl alloy, 8 WC-Co cutting inserts, 9 13 14 silicon wafers, 10 11 13 14 16 and Mo plate. 12 In this study, alternating ZrO 2 /Al 2 O 3 nano-multilayers were deposited on steel substrates by CAPD, which is widely used in industry to deposit nano-multilayered hard nitride films on cutting tools.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] However, the oxidation behavior of ZrO 2 /Al 2 O 3 thin films has not been adequately studied before, although the films were frequently exposed to oxidative atmospheres at high temperatures during their service as wear and corrosion resistant hard ones. Cyclic oxidation resistance of the electrolytically deposited ZrO 2 /Al 2 O 3 micro-laminated film was briefly studied at 900 C. 6 The film consisted of tetragonal-ZrO 2 , -Al 2 O 3 , and -Al 2 O 3 , and it improved the oxidation resistance of the stainless steel substrate because micro-laminated Al 2 O 3 layers suppressed inward oxygen diffusion.…”