High temperature oxidation of ZrO2/Al2O3 thin films deposited on steel.
Thin ZrO2/Al2O3 films that consisted of alternating monoclinic ZrO2 nanolayers and amorphous Al2O3 nanolayers were deposited on a tool steel substrate using Zr and Al cathodes in a cathodic arc plasma deposition system, and then oxidized at 600-900 degrees C in air for up to 50 h. The ZrO2/Al2O3 films effectively suppressed the oxidation of the substrate up to 800 degrees C by acting as a barrier layer against the outward diffusion of the substrate elements and inward diffusion of oxygen. However, rapid oxidation occurred at 900 degrees C due mainly to the increased diffusion and subsequent oxidation of steel as well as the crystallization of amorphous Al2O3.
Department of Materials Science and Engineering, Myongji University, Yongin, 449-728, South Korea.
Jae Chun
JC
Lee
Sun Kyu
SK
Kim
Trinh
T
Van Trung
Dong Bok
DB
Lee
D000327:Adsorption; D000535:Aluminum / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D006361:Heating / Q000379:methods; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008968:Molecular Conformation; D010084:Oxidation-Reduction; D010316:Particle Size; D058626:Plasma Gases / Q000737:chemistry*; D013232:Steel / Q000737:chemistry*; D013499:Surface Properties; D015040:Zirconium / Q000737:chemistry*
D046911:Macromolecular Substances; D008567:Membranes, Artificial; D058626:Plasma Gases; D013232:Steel; D015040:Zirconium; D000535:Aluminum; C028541:zirconium oxide