Nanostructured Cobalt Tungstate (CoWO4): A Highly Promising Material for Fabrication of Protective Oxide Film on Copper in Chloride Medium

2019 ◽  
Vol 166 (16) ◽  
pp. C631-C641 ◽  
Author(s):  
V. I. Chukwuike ◽  
S. Sam Sankar ◽  
Subrata Kundu ◽  
R. C. Barik
Keyword(s):  
Oxide Film ◽  
Promising Material ◽  
Protective Oxide ◽  
Chloride Medium ◽  
Protective Oxide Film ◽  
Cobalt Tungstate

Characterization of chemically modified thin films for optimization of metal CMP applications

2013 ◽  
Vol 1560 ◽  
Author(s):  
G. Bahar Basim ◽  
Ayse Karagoz ◽  
Zeynep Ozdemir
Keyword(s):  
Thin Films ◽  
Oxide Film ◽  
Metal Oxide ◽  
Film Structure ◽  
Protective Oxide ◽  
Metal Oxide Thin Films ◽  
Chemically Modified ◽  
Surface Active Agents ◽  
Protective Oxide Film ◽  
The Stability

ABSTRACTMetal CMP applications necessitate the formation of a protective oxide film in the presence of surface active agents, oxidizers, pH regulators and other chemicals to achieve global planarization. Formation and mechanical properties of the chemically modified metal oxide thin films in CMP determine the stresses develop at the interfaces delineating the stability and protective nature of the chemically altered films on the surface of the metal wafer. The balance between the stresses built in the film structure versus the mechanical actions provided during the process can be used to optimize the process variables and furthermore help define new planarization techniques for the next generation microelectronic device manufacturing. In this study, the preliminary studies were concentrated on the very well established tungsten CMP applications and furthermore, titanium CMP applications were presented as a part of surface nano-structuring methodology for biomedical applications by stressing the synergistic effect of protective metal oxide film of titanium in this advanced application.

Microstructure and Hot Corrosion Properties of Laser Cladding of a Co-Base Alloy on the Leaf Surface of Gas Turbine

2011 ◽  
Vol 299-300 ◽  
pp. 183-187
Author(s):  
Song Zhang ◽  
Gong You Zhou ◽  
Fang Hu ◽  
Chun Hua Zhang ◽  
Mao Cai Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
Gas Turbine ◽  
Hot Corrosion ◽  
Carbon Dioxide Laser ◽  
Base Alloy ◽  
Stainless Steel Surface ◽  
Protective Oxide ◽  
Corrosion Properties ◽  
Protective Oxide Film

The temperatures inside the gas turbine reach up to 1000°C, alloys used for gas turbine components must be oxidation, and corrosion resistant, and stable in structure under high temperature circumstances. A Co-based alloy was cladded on the 1Cr18Ni9Ti stainless steel surface using a high power carbon dioxide laser. The microstructure evolution and hot corrosion properties of samples in 75%Na2SO4+25%NaCl saline were investigated. The results show that the microstructures of the cladded layer is fine, and the hot corrosion resistance of the cladded layer was significantly improved because of the formation of a protective oxide film of CoO and CoO•Cr2O3. Under high temperature corrosive atmosphere, the high content of Co promoted the formation of the protective oxide film. The refinement of dendritic structures and the formation of Co-based alloy oxides lower the penetration rate of the sulphur ions that induce the intergranular corrosion.

High Temperature Corrosion of Microturbine Combustor Material

2007 ◽  
Author(s):  
Hiroshi Yakuwa ◽  
Tadashi Kataoka
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
High Temperature Corrosion ◽  
Protective Oxide ◽  
Lean Burn ◽  
Protective Oxide Film ◽  
Unburned Hydrocarbons ◽  
The Rich ◽  
Good Heat Resistance ◽  
Good Heat

Two particular types of high temperature corrosion in a microturbine Rich-burn, Quick-mix, Lean-burn (RQL) combustor are discussed and reported in this paper. One type occurred in mixing tubes, part of fuel supply into the combustor. Dense concentrations of carbon monoxide and unburned hydrocarbons in a high temperature environment carburized the mixing tube, leaving it vulnerable to corrosion. The Co-based alloy was selected for the advantage of good heat resistance was exchanged for a Ni-Cr based alloy of good carburization resistance and the life of combustor successfully extended. The second type is a pitting corrosion on the inner wall of liner in the rich-burn zone. It is inferred that the corrosion was metal dusting caused from defects of the oxide film on the inner wall surface. As a countermeasure, a preoxidation step was applied to the combustor to maintain a protective oxide film for a longer period of time. This paper discusses the mechanisms and the countermeasures for these types of corrosion, which relate to carbon from the fuel origin activated in the fuel-rich environment in the combustor.

scholarly journals STUDY OF THE STRUCTURE AND PHASE COMPOSITION OF THE OXIDE FILM ON THE SURFACE OF A LAYERED COATING OF THE Al-Ni SYSTEM

2020 ◽  
pp. 14-18
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
V. P. Kulevich ◽  
R. D. Evchits
Keyword(s):  
Phase Composition ◽  
Oxide Film ◽  
Heating Temperature ◽  
Atmospheric Oxygen ◽  
Complex Oxide ◽  
Protective Oxide ◽  
Layered Coating ◽  
Protective Oxide Film ◽  
Temperature Heating ◽  
High Temperature Heating

This work is aimed to the study of the structure and phase composition of the oxide film formed on the surface of the layered coating of the Al-Ni system during high-temperature heating. It was experimentally established that at the initial stages of heat treatment, as a result of the interaction of the Al-Ni system layered coating with atmospheric oxygen, separate sections of Al2O3 oxide are formed on its surface, which are agglomerates of plate crystals of α-modification of nanometer thickness, which increase and grow together with increasing exposure time continuous protective oxide film. An increase in the heating temperature leads to an intensification of oxidation processes and the formation of a complex oxide film of AlO and spinel NiAlO.

The fate of the protective oxide film on stainless steel upon early stage growth of a biofilm

2015 ◽  
Vol 91 ◽  
pp. 352-356 ◽  
Author(s):  
Antoine Seyeux ◽  
Sandrine Zanna ◽  
Audrey Allion ◽  
Philippe Marcus
Keyword(s):  
Stainless Steel ◽  
Oxide Film ◽  
Early Stage ◽  
Protective Oxide ◽  
Protective Oxide Film

Tribological Study of Chemical States of Protective Oxide Film Formed on Steel After Sliding in Humid Atmosphere and in Aqueous Solutions

1997 ◽  
Vol 119 (4) ◽  
pp. 613-617 ◽  
Author(s):  
T. Saito ◽  
Y. Imada ◽  
K. Sugita ◽  
F. Honda
Keyword(s):  
Oxide Film ◽  
Aqueous Solutions ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Protective Oxide ◽  
Humid Atmosphere ◽  
Electron Probe Microanalyzer ◽  
Tribological Study ◽  
Protective Oxide Film ◽  
Chemical States

A tribological study of low-carbon steel was carried out in humid atmospheres and in corrosive aqueous solutions (water and 1 percent H2O2 solution), to determine the chemical states of the protective oxide film and its tribological properties. The chemical states of the oxide film on the slid steel surface were determined using an electron probe microanalyzer. The analytical results showed that the Fe3O4 layer effectively reduced the friction coefficient, whereas FeO and Fe2O3 did not. The chemical states and compositions of the oxide film were attributed to the sliding conditions which induced the oxidation tribologically. And the oxide forms remained stable until analysis even in the aqueous solutions. Friction work was a simple and useful parameter for classifying corrosive and mechanical wear on the slid surface.

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