The Experts below are selected from a list of 61830 Experts worldwide ranked by ideXlab platform
Tetsuya Suzuki - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and Oxidation Resistance of TiAlSiN and multilayer TiAlSiN/CrAlN coating
Surface & Coatings Technology, 2009Co-Authors: N. Fukumoto, H. Ezura, Tetsuya SuzukiAbstract:Abstract Oxidation resistant is one main factor to investigate for protective coatings of cutting tool application. In addition the formation of multilayer structure can be an alternative in improving the Oxidation Resistance. The monolayer TiAlSiN and multilayer TiAlSiN/CrAlN coating was deposited by cathodic arc ion-plating (AIP) method and Oxidation Resistance was studied in the range of 800 to 1000 °C. TiAlSiN with 10 at.% of Si added to TiAlN showed a cubic structured coating with a nanocomposite structure from transmission electron microscopy observation (TEM). Multilayer coatings with different periods, both showed uniform multilayer structure and measured period were 12.3 and 5.5 nm. The TiAlSiN/CrAlN coating of 5.5 nm showed superior Oxidation Resistance compared to monolayer TiAlSiN coating, with nitride coatings still existing even after 1000 °C. The additional amount of Al content of CrAlN to the TiAlSiN system prompt a formation of solid oxide layer of Al and Si-rich oxide on the top surface by forming a multilayer structure. In addition, the Oxidation Resistance was further improved for smaller period coatings. Its high number of interfaces and the crystal morphology of each layer worked as a barrier for oxygen inner diffusion and outer diffusion of metal contents to improve the Oxidation Resistance.
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Oxidation Resistance of Cr1-XAlXN and Ti1-XAlXN films
Surface and Coatings Technology, 2003Co-Authors: Masahiro Kawate, Ayako Kimura Hashimoto, Tetsuya SuzukiAbstract:Cr1−XAlXN films were synthesized on mirror-polished stainless steel substrates by the arc ion plating method using Cr1−XAlX alloy targets with diffent Al contents. Oxidation Resistance of films was estimated by heating substrates in air at 800, 900 and 1000 °C and subsequent analysis by the X-ray diffraction method (XRD). The XRD peaks from Ti0.7Al0.3N films, annealed at 800 °C for 14 h, disappeared and the peaks from iron oxides consequently appeared. The Oxidation Resistance of Ti1−XAlXN films improved with increasing Al content X. On the other hand, the peaks from Cr1−XAlXN films which were annealed at 800 °C did not change at all, but Cr1−XAlXN films were slightly oxidized over 900 °C. It is considered that the Oxidation Resistance of Cr1−XAlXN films was superior to that of Ti1−XAlXN films.
Nack J. Kim - One of the best experts on this subject based on the ideXlab platform.
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The effect of yttrium addition on the Oxidation Resistance of EPM TiAl-based intermetallics
Scripta Materialia, 2003Co-Authors: Sun-kuen Hwang, Soo Woo Nam, Nack J. KimAbstract:Abstract The effect of yttrium on the Oxidation Resistance of elemental powder metallurgy (EPM) processed TiAl-based alloys was studied. Y-addition improved the Oxidation Resistance of the experimental alloys exposed at 800 °C for 350 h. The improved Oxidation Resistance was attributed to a fine-grained (Y, Al)O-type oxides and the segregation of Y in the grain boundaries and at the interfaces of Al 2 O 3 in the Y-rich layer.
P H Mayrhofer - One of the best experts on this subject based on the ideXlab platform.
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thermal stability and Oxidation Resistance of ti al n coatings
Surface & Coatings Technology, 2012Co-Authors: Li Chen, J Paulitsch, P H MayrhoferAbstract:Ti1 − xAlxN coatings are widely used for wear resistant applications due to their excellent mechanical and thermal properties, which depend to a great extent on the Al content. Here, we concentrate on a comparative study of the effect of Al content on crystal structure, thermal stability and Oxidation Resistance of Ti1 − xAlxN coatings. In agreement to earlier studies, thermal annealing of the individual cubic (c) and wurtzite (w) structured metastable Ti1 − xAlxN coatings induces decomposition into their stable phases c-TiN and w-AlN. The decomposition process for c-Ti1 − xAlxN involves an intermediate formation of cubic Al-rich and Ti-rich domains which results in a hardness increase to 34.7 and 34.4 GPa for x = 0.52 and 0.62 when annealed at 950 and 900 °C, respectively. In general, coatings with an Al content closer to the solubility limit, exhibit an earlier decomposition process, and hence an earlier peak-hardness. During exposure of the Ti1 − xAlxN coatings to ambient air at elevated temperatures Al2O3, TiO2 and Al2TiO5 are formed. The Oxidation Resistance of as-deposited single-phase Ti1 − xAlxN coatings, cubic or wurtzite structured, increases with increasing Al content. However, coatings containing Al contents at the metastable solubility limit, which result in a mixed cubic–wurtzite structure, have the worst Oxidation Resistance of the Al-containing coatings investigated. The single phase wurtzite structured coating w-Ti0.25Al0.75N shows the best Oxidation Resistance, with only ~0.7 μm oxide scale thickness, after thermal exposure for 20 h at 850 °C in ambient air.
S. Dubois - One of the best experts on this subject based on the ideXlab platform.
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Microstructure-Oxidation Resistance relationship in Ti3AlC2 MAX phase
Journal of Alloys and Compounds, 2020Co-Authors: E. Drouelle, V. Gauthier-brunet, J. Cormier, P. Villechaise, P. Sallot, F. Naimi, F. Bernard, S. DuboisAbstract:Spark Plasma Sintering and Hot Isostatic Pressing were used to synthesize coarse-grained and fine-grained Ti3AlC2 specimens. Moreover, Spark Plasma Sintering processing parameters were modified in order to vary the TiC, Al2O3 and TixAly impurity and the porosity contents in the fine-grained samples. The influence of the Ti3AlC2 microstructure on the Oxidation Resistance was assesed. It is demonstrated that the grain size can drastically modify the Oxidation Resistance. The higher density of grain boundaries, in fine-grained specimens, increases the number of Al diffusion paths and leads to the formation of a protective alumina scale. In coarse-grained sample, Al diffusion is the rate limiting step of the α−Al2O3 formation and TiO2 is formed simultaneously to alumina. TiC impurities and porosity are demonstrated to be detrimental to the Oxidation Resistance in the 800 °C–1000 °C temperature range by favouring TiO2 formation. Finally, it is also shown that, for fine-grained specimens, the oxide scale grows very slowly for Oxidation times in the range 20–40 days.
Masahiro Kawate - One of the best experts on this subject based on the ideXlab platform.
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Oxidation Resistance of Cr1-XAlXN and Ti1-XAlXN films
Surface and Coatings Technology, 2003Co-Authors: Masahiro Kawate, Ayako Kimura Hashimoto, Tetsuya SuzukiAbstract:Cr1−XAlXN films were synthesized on mirror-polished stainless steel substrates by the arc ion plating method using Cr1−XAlX alloy targets with diffent Al contents. Oxidation Resistance of films was estimated by heating substrates in air at 800, 900 and 1000 °C and subsequent analysis by the X-ray diffraction method (XRD). The XRD peaks from Ti0.7Al0.3N films, annealed at 800 °C for 14 h, disappeared and the peaks from iron oxides consequently appeared. The Oxidation Resistance of Ti1−XAlXN films improved with increasing Al content X. On the other hand, the peaks from Cr1−XAlXN films which were annealed at 800 °C did not change at all, but Cr1−XAlXN films were slightly oxidized over 900 °C. It is considered that the Oxidation Resistance of Cr1−XAlXN films was superior to that of Ti1−XAlXN films.
