Investigation into the structure and quality of carbon/carbon-SiC composites

Perova, Tatiana S.; Maile, Karl; Lyutovich, A.; Berreth, Karl; Potapova, Daria; Zies, G.; Moore, A.

doi:10.1117/12.463694

Cited by 2 publications

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“…The first order Raman spectrum of graphitic materials in the range of 1200-1700 cm 21 , also known as the carbon region, has two main features: [14][15][16][17] graphitic (G band) and interlayer disorder mode (D band, see Fig. 1).…”

Section: Resultsmentioning

confidence: 99%

“…This D band is only active for crystallites of finite size and ranges from 1350 to 1390 cm 21 , while the G band has E 2g symmetry and typically appears at y1580 cm 21 . 16,17 From this region, the information on crystallite size in the samples via the integrated intensity ratio I D /I G can be obtained. The investigations into amorphous hydrogenated carbon show that the D and G modes are also sensitive to the type of carbon bonding, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…It is believed that the Raman spectrum registered for sample S11 belongs to the C/C-SiC substrate. 17 The depth of penetration of 514 . 5 nm laser light can vary from 35 nm for graphite up to a few hundred nanometers in carbon containing materials.…”

Section: Resultsmentioning

confidence: 99%

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MicroRaman spectroscopy of protective coatings deposited onto C/C–SiC composites

Perova¹,

Moore²,

Berreth³

et al. 2007

Materials Science and Technology

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MicroRaman spectroscopy has been used in the present work to investigate the structure and composition of pyrolytic carbon (PyC) and SiC protective coatings formed under various chemical vapour deposition conditions. Analysis of spectra obtained during Raman line mapping experiments on samples with graded SixCy layer in the region of about 700–1000 cm−1 allows information to be extracted on different SiC polytypes. It was found that the graded SiC layered sample contained a mixture of 3C–SiC and 6H–SiC polytypes at the film/substrate interface, but for the major part of this layer the 3C–SiC ( β-SiC) phase predominates. For pure PyC films, it was found that the formation of PyC layer begins at 1200°C and the layer formed at this temperature is more uniform with slightly larger crystallite size (∼3 nm) compared to that in the layer formed at 1300°C.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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MicroRaman spectroscopy of protective coatings deposited onto C/C–SiC composites

Perova¹,

Moore²,

Berreth³

et al. 2007

Materials Science and Technology

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“…Reactive conversion coating occurs with free Si available within the substrate reacting with the C out of the gaseous CH 4 and forms SiC. This is confirmed by Raman spectroscopy [6]. Up-scaling from laboratory scale or bench scale unit towards industrial application is based on a totally computer controlled laboratory process.…”

mentioning

confidence: 84%

“…Automated CVD. The second route realised to produce a FGM is the automated CVD process [6][7][8]. Samples of C/C-SiC of Schunk Kohlenstofftechnik were used as substrates.…”

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confidence: 99%

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

Maile

Berreth²,

Lyutovich³

2005

MSF

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This paper reflects our R&D results in the field of functionally graded coating processes. For industrial applications a special architecture for coatings is necessary: because the surface has to withstand environmental attacks, specific physical and mechanical functions and characteristics are required. In the interface region to the substrate additional stresses and strains occur due to the different materials combined. Consequently, the coatings have to be chemically and mechanically adjusted to the substrates. For this challenging problem, a concept named Materials Adapter has been developed within the frame of different research programs at MPA. For optimisation of the interface region an ion bombardment-activated inter-diffusion process ("ion mixing") was employed by using ion assisted electron beam PVD (IA EB PVD). Several Cr, Ti, Al and Zr coatings have been produced. An automated precursor inlet has been installed for CVD processes to obtain preset composition profiles for graded systems. Especially multilayer stacks of PyC-SixCy-SiC-Si3N4-Al2O3 have been deposited in a single growth process. The structure and composition of the coatings and interfaces were investigated by XRD, AFM, SEM, EDX, EPMA, ESCA and the micro-Raman spectroscopy. The characterisation confirms the gradual transition between Si and Cr, as well as between Cr and Al deposited by IA EB PVD and between C and Si grown by CVD.

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Investigation into the structure and quality of carbon/carbon-SiC composites

Cited by 2 publications

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MicroRaman spectroscopy of protective coatings deposited onto C/C–SiC composites

MicroRaman spectroscopy of protective coatings deposited onto C/C–SiC composites

Functionally Graded Coatings of Carbon Reinforced Carbon by Physical and Chemical Vapour Deposition (PVD and CVD)

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