Journal ArticleDOI
Oxidation of commercial purity titanium
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TLDR
In this paper, a moving boundary in the substrate, parallel to the oxide-metal interface, was associated with a specific oxygen level of 5.0 + or - 0.5 at. pct.Abstract:
The oxidation kinetics of commercial purity Ti-A55 exposed to laboratory air in the 593-760 C temperature range were continuously monitored by thermogravimetric analysis. The oxide thickness was measured by microscopy, and the substrate contamination was estimated from microhardness measurements. The microhardness depth profiles were converted to oxygen composition profiles using calibration depth. The oxygen diffusion coefficient in alpha-Ti appears to be approximately concentration-independent in the 1-10 at. pct oxygen range. Diffusion coefficient for oxygen in TiO2 has been estimated as a function of temperature and is found to be about 50 times the value in alpha-Ti. The metallographically prepared cross sections of the oxidized specimens revealed a 'moving boundary' in the substrate, parallel to the oxide-metal interface. This boundary was associated with a specific oxygen level of 5.0 + or - 0.5 at. pct. It occurred at a distance from the oxide-metal interface which was correlatable with temperature and time of exposure. The diffusion coefficient corresponding to the composition of this moving boundary is in excellent agreement with the effective diffusion coefficient for the substrate contamination.read more
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Journal ArticleDOI
The effects of combined micron-/submicron-scale surface roughness and nanoscale features on cell proliferation and differentiation
Rolando A. Gittens,Taylor McLachlan,Rene Olivares-Navarrete,Ye Cai,Simon Berner,Rina Tannenbaum,Zvi Schwartz,Kenneth H. Sandhage,Barbara D. Boyan +8 more
TL;DR: The results suggested that the introduction of such nanoscale structures in combination with micro-/submicro-scale roughness improves osteoblast differentiation and local factor production, which indicates the potential for improved implant osseointegration in vivo.
Journal ArticleDOI
Oxidation of Ti-6Al-4V alloy
Hasan Guleryuz,Huseyin Cimenoglu +1 more
TL;DR: In this paper, an analysis of the ODZ depth and hardness measurements resulted in an activation energy of 202 kJ/mol for oxygen diffusion in Ti-6Al-4V alloy.
Journal ArticleDOI
Rutile-type TiO2 thin film for high-k gate insulator
Masaru Kadoshima,Masahiko Hiratani,Yasuhiro Shimamoto,Kazuyoshi Torii,Hiroshi Miki,Shinichiro Kimura,Toshihide Nabatame +6 more
TL;DR: In this article, a single phase of rutile-type TiO2 whose dielectric constant of approximately 75 was obtained when the film was deposited in an inert gas atmosphere and annealed at 800 °C in an oxidizing gas atmosphere.
Journal ArticleDOI
Oxidation behavior of several chromia-forming commercial nickel-base superalloys
TL;DR: In this article, Ni-base superalloys were exposed isothermally in air at temperatures between 750° and 1000°C and also under cyclic conditions at 1000°c.
Journal ArticleDOI
High-temperature oxidation of ion-plated TiN and TiAlN films
Hiroshi Ichimura,Atsuo Kawana +1 more
TL;DR: In this paper, the high-temperature oxidation of TiN, Ti0.9Al0.1N, and Ti 0.4N films which were deposited onto stainless steel substrates using an arc ion-plating apparatus was studied at temperatures ranging from 923 to 1173 K for 0.6 to 60 ks in air.
References
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Book
The mathematics of diffusion
TL;DR: Though it incorporates much new material, this new edition preserves the general character of the book in providing a collection of solutions of the equations of diffusion and describing how these solutions may be obtained.