Surface modification of TiN hard coatings with concentrated solar energy

Franck, M.; Blanpain, Bart; Oberländer, Barbara; Célis, Jean-Pierre; Roos, Jozef

doi:10.1016/0927-0248(93)90133-n

Cited by 12 publications

(11 citation statements)

References 27 publications

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“…3, demonstrating the transformation of the metastable anatase into the thermodynamically stable rutile polymorph. 3 The small standard deviations (cr n ) on the peak position (Table I) illustrate the compositional homogeneity of the oxide layers formed. The present result shows a lower conversion temperature as was also found in nanophase TiO 2 .…”

Section: Resultsmentioning

confidence: 96%

“…The rutileanatase mixtures do not persist after prolonged solar beam treatment at 600 °C, as shown in Fig. 3 The calibration curve may be applied here in good approximation because a grain size dependence of the Raman peaks was experimentally ruled out. A complete anatase-to-rutile conversion in coarse-grained TiO 2 powders is known to take place at 750 °C in air at atmospheric pressure.…”

Section: Resultsmentioning

confidence: 99%

“…2 -3 The sample disks were photothermally heated up to 400, 600, and 800 °C in the test furnace for metallurgical heat treatments. 3 A mean heating rate of 1.5 °C/s could be discerned on the temperature-time plots except for the treatments at 800 °C where the heating rate slowed down when passing 700 °C. Figure 1 displays the sample temperature as a function of time for different treatments at 400, 600, and 800 °C.…”

Section: A Sample Preparationmentioning

confidence: 90%

“…3 The physical vapor deposited (PVD) TiN coatings were partially oxidized by solar beam heat treatments at 800 °C in ambient air. Common applications are photovoltaic solar cells to convert solar photons into electrical energy, and selective absorbers for solar photothermal conversion.…”

Section: Introductionmentioning

confidence: 99%

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Microprobe Raman spectroscopy of TiN coatings oxidized by solar beam heat treatment

1995

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Physical vapor deposited TiN coatings oxidized by solar beam heat treatment in air were examined by microprobe Raman spectroscopy. The Raman spectra of TiN treated at 400 °C indicated incipient oxidation by the presence of anatase TiO2 and additionally showed a broadband feature around the forbidden TiN vibrational mode. Inhomogeneous mixtures of rutile TiC>2 and small amounts of anatase polymorph (<10%) were detected for the treatments at 600 °C only during the initial stage of oxidation. Prolonged treatment at 600 °C resulted in a complete anatase-to-rutile conversion. Rutile was identified as the single product of oxidation of the TiN samples treated at 800 °C. Peak analysis of the rutile spectra revealed no substantial spectral shifts, demonstrating an oxide growth of nearly stoichiometric rutile with an estimated composition in the range of Ti02±o.o2-The Raman scattered light intensity could be correlated with the rutile layer thickness.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: A Sample Preparationmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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Microprobe Raman spectroscopy of TiN coatings oxidized by solar beam heat treatment

1995

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“…Como, p.ej., la síntesis de TiN por reacción gas-sólido en la superficie de titanio y aleaciones de titanio. Esta opción posee grandes atractivos y viene siendo explorada, desde hace varios años, por diversos laboratorios (9)(10)(11)(12)(13)(14)(15). La energía solar concentrada tiene muchas ventajas evidentes, entre ellas, la gratuidad de una fuente energética que, además, es limpia y no contaminante.…”

Section: Introductionunclassified