Raman spectroscopy characterization of diamond films on steel substrates with titanium carbide arc-plated interlayer

Polini, Riccardo; Mattei, Giorgio; Valle, R.; Casadei, F.

doi:10.1016/j.tsf.2006.07.164

Cited by 24 publications

(9 citation statements)

References 27 publications

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“…Iron catalyzes graphite formation at diamond/steel interfaces during the CVD process [26,27] and the high solubility of carbon in the iron fcc phase results in prolonged diamond nucleation times [24,28]. Diamond and steel have very different coefficients of thermal expansion, which result in high stress within any diamond film deposited directly on steel [24].…”

Section: Resultsmentioning

confidence: 99%

“…1(b) and (c) demonstrates growth of isolated FSDCs on AISI 1085 carbon steel substrates; these FSDCs show evidence of etching at the twin-plane boundary. The high solubility of carbon in the fcc phase of iron in this case ensures the long nucleation times [24] and low nucleation densities needed for observation of isolated FSDCs. Tungsten is less prone to carbide formation than Ti, Mo (or Fe) under typical diamond growth conditions, and was thus the substrate of choice (99.9 wt%, size: 6 Â 6 Â 3 mm 3 ) for most of the present studies.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Fabrication of high density, adherent films of five-fold symmetric diamond crystals by hot filament chemical vapour deposition

Wei¹,

Ashfold²,

Yu³

et al. 2011

Journal of Crystal Growth

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Fabrication of high density, adherent films of five-fold symmetric diamond crystals by hot filament chemical vapour deposition

Wei¹,

Ashfold²,

Yu³

et al. 2011

Journal of Crystal Growth

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“…In principle, the selected interlayer should meet the following requirements [9]: 1) avoid the diffusion of Fe towards interlayer surface; 2) allow the nucleation and growth of diamond on interlayer surface; 3) supply a good bonding to both diamond films and steel substrate; 4) have a suitable thermal expansion coefficient, which should be beneficial in reducing the mismatch between diamond and substrate. Improved nucleation and adhesion of diamond films have been obtained by the applications of various interlayers, such as W [8], Al [10], Mo [11], Ti, Cr [12], TiC [13] and CrN [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of methane on hot filament CVD diamond films deposited on high-speed steel substrates with WC-Co interlayer

Wang

Wei

et al. 2011

J. Cent. South Univ. Technol.

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Diamond films were deposited on high-speed steel substrates by hot filament chemical vapor deposition (HFCVD) method. To minimize the early formation of graphite and to enhance the diamond film adhesion, a WC-Co coating was used as an interlayer on the steel substrates by high velocity oxy-fuel spraying. The effects of methane content on nucleation, quality, residual stress and adhesion of diamond films were investigated. The results indicate that the increasing methane content leads to the increase in nucleation density, residual stress, the degradation of quality and adhesion of diamond films. Diamond films deposited on high-speed steel (HSS) substrate with a WC-Co interlayer exhibit high nucleation density and good adhesion under the condition of the methane content initially set to be a higher value (4%, volume fraction) for 30 min, and then reduced to 2% for subsequent growth at pressure of 3 kPa and substrate temperature of 800 °C.

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“…Moreover, the film may be subjected to a high level of stress that may even cause the delamination of the diamond layer from the hard metal substrate. 2 Therefore, a study of diamond films deposited at varying the substrate pretreatments and/or the deposition parameters may be useful for industrial applications. In this respect, the application of Raman spectroscopy and photoluminescence (PL) to the study of the crystalline quality and phase purity of polycrystalline diamond films grown by microwave-plasma-enhanced chemical vapor deposition (CVD) on Si substrates has already led to the individuation of the best deposition conditions of 'detector grade' synthetic diamond.…”

Section: Introductionmentioning

confidence: 99%

Raman and photoluminescence study of hot filament CVD diamond films grown on WC–Co substrates

Donato

Faggio

Messina

et al. 2008

J Raman Spectroscopy

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In this work, a Raman and photoluminescence (PL) study of synthetic diamond films grown by hot filament chemical vapor deposition (CVD) on WC-Co is presented. The changes in the Raman spectrum induced by the different pretreatments of the substrate and/or different growth parameters of the films are discussed. In particular, the spectra of the films grown at 740°C substrate temperature, 36 mbar pressure and 1.7% methane content in the CH 4 -H 2 gas mixture and after different substrate pretreatments show all the features commonly observed in nanocrystalline diamond films, overlapped with a large PL background. A significant level of compressive stress is qualitatively deduced by the shift of the diamond Raman peaks. The different pretreatments of the substrates seem to have no influence on the quality of the diamond films. On the contrary, in samples grown at 700°C substrate temperature, 10 mbar pressure and 1% methane content in the CH 4 -H 2 gas mixture, the contribution of the non-diamond carbon phases to the Raman spectrum substantially decreases, even though the diamond Raman peak remains shifted and broad. Impurities in the films have been identified by means of low-temperature PL measurements. Wand Si-related optical centers have been clearly observed, together with a band at approximately 1.967 eV probably connected to a nitrogen-related defect center.

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Raman spectroscopy characterization of diamond films on steel substrates with titanium carbide arc-plated interlayer

Cited by 24 publications

References 27 publications

Fabrication of high density, adherent films of five-fold symmetric diamond crystals by hot filament chemical vapour deposition

Fabrication of high density, adherent films of five-fold symmetric diamond crystals by hot filament chemical vapour deposition

Influence of methane on hot filament CVD diamond films deposited on high-speed steel substrates with WC-Co interlayer

Raman and photoluminescence study of hot filament CVD diamond films grown on WC–Co substrates

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