Titanium-to-rutile oxidation kinetics in the direct-oxidation fabrication of thin-wall ceramics

Солнцев, К. А.; Zufman, V. Yu.; Аладьев, Н. А.; Шевцов, С. В.; Chernyavskii, A. S.; Stetsovskii, A.P.

doi:10.1134/s002016850808013x

Cited by 14 publications

(3 citation statements)

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“…The problems inherent in the fabrication of TiO 2 materials more appropriate to optical studies (i.e., materials with spectra responsive to different treatments) are of current interest. In this regard, some years ago, a novel approach was proposed for fabricating rutile ceramic layers by direct high-temperature oxidation of titanium substrates possessing a complex form. − Under calcinations in air at 850 °C, the thickness of the final rutile layer reached 3–4 mm. It was found that during the cooling period a white or cream-colored oxide layer readily separated from the titanium substrates .…”

Section: Introductionmentioning

confidence: 99%

Thermo- and Photo-stimulated Effects on the Optical Properties of Rutile Titania Ceramic Layers Formed on Titanium Substrates

et al. 2012

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This Article reports on the thermo-and photostimulated effects on the optical properties of rutile titania ceramic layers fabricated in an air atmosphere by hightemperature calcination of (technical grade) titanium substrates. The so-formed layers peeled off spontaneously during the cooling phase back to ambient temperature to reveal a yellow-colored upper surface and a cream-colored bottom surface that was in contact with the titanium plate. The two surfaces of the layers and a powdered specimen (formed from grinding the peeled-off layers) were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, electron dispersive spectroscopy, and diffuse reflectance spectroscopy. The upper surface demonstrates a strong photochromic effect. A pronounced increase of the amplitude of the absorption bands at 2.06 eV (AB3) and 1.56 eV (AB4) seen under irradiation in the UV or visible spectral region and a strong decrease of these bands during the heating of irradiated samples to 200−230 °C were characteristics of the upper layer's surface. A wide set of spectra resulting from the reversible absorption changes made possible the disclosure of higher-energy absorption bands at 2.91 eV (AB1) and 2.54 eV (AB2); the latter were not affected by irradiation and heating. An electronic mechanism based on known properties of intrinsic point defects of TiO 2 , F-type centers (two electrons trapped in oxygen vacancies) and Ti 3+ centers, is proposed to account for the optical changes that occurred through the photoinduced formation, photobleaching, and thermal bleaching of the absorption bands.

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Section: Introductionmentioning

confidence: 99%

Thermo- and Photo-stimulated Effects on the Optical Properties of Rutile Titania Ceramic Layers Formed on Titanium Substrates

et al. 2012

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“…Theoretical and experimental studies of the oxidation of titanium and its alloys by P. Kofstad, D. Liner, as well as more recent studies are well-known [4]. However, it is an important problem of obtaining mechanically strong functional coatings having bioactivity on the surface of metallic biocompatible materials.…”

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confidence: 99%

Structure of Composite Biocompatible Titania Coatings Modified with Hydroxyapatite Nanoparticles

Fomin¹,

Rodionov²,

Steinhauer³

et al. 2013

AMR

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The article describes prospective composite biocompatible titania coatings modified with hydroxyapatite nanoparticles and obtained on intraosseous implants fabricated from commercially pure titanium. Consistency changes of morphological characteristics and crystalline structure, mechanical properties and biocompatibility of experimental titanium implant coatings obtained by the combination of oxidation and surface modification with hydroxyapatite during induction heat treatment are defined.

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“…A characteristic feature of these methods is high energy consumption and cost of materials, coating material low efficiency, complex technological sequence, relatively long duration of obtaining the required phase-structural state, decreased mechanical strength and fracture toughness at high porosity, and limited or lack of possible formation of nanometer structure elements. Theoretical and experimental studies of the oxidation of titanium and its alloys by P. Kofstad, D. Liner, as well as more recent studies are well-known [6]. However, it is an important problem of obtaining mechanically strong functional coatings having bioactivity on the surface of metallic biocompatible materials.…”

Section: Introductionmentioning

confidence: 97%

Nanostructure of biocompatible titania/hydroxyapatite coatings

et al. 2014

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The article describes prospective composite biocompatible titania coatings modified with hydroxyapatite nanoparticles and obtained on intraosseous implants fabricated from commercially pure titanium VT1-00. Consistency changes of morphological characteristics, crystalline structure, physical and mechanical properties and biocompatibility of experimental titanium implant coatings obtained by the combination of oxidation and surface modification with hydroxyapatite during induction heat treatment are defined.

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Titanium-to-rutile oxidation kinetics in the direct-oxidation fabrication of thin-wall ceramics

Cited by 14 publications

References 1 publication

Thermo- and Photo-stimulated Effects on the Optical Properties of Rutile Titania Ceramic Layers Formed on Titanium Substrates

Thermo- and Photo-stimulated Effects on the Optical Properties of Rutile Titania Ceramic Layers Formed on Titanium Substrates

Structure of Composite Biocompatible Titania Coatings Modified with Hydroxyapatite Nanoparticles

Nanostructure of biocompatible titania/hydroxyapatite coatings

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