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1

Digitale Medien

Characterisation of boron nitride fibre coatings with different crystalline order by TEM and XPS (1999)

Dietrich, D. ; Stöckel, S. ; Weise, K. ; [weitere]

Springer

Fresenius' journal of analytical chemistry 365 (1999), S. 255-257

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ISSN: 1432-1130

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Reinforcement effects in composites are widely influenced by fibre coatings. A detailed understanding of their microstructure and chemical composition is of great interest. Boron nitride films were deposited continuously on fibre rovings of various ceramics in CVD reactors of vertical as well as horizontal position. XPS depth profilings show that the film compositions are close to stoichiometric BN with carbon and oxygen impurities in the range of 10 at%. Cross-sections of separated fibres were investigated by HREM and TEM diffraction. All BN films are hexagonal turbostratic. The (002) layers with an increased distance (about 0.36 nm) showed a mean stacking sequence near to graphite and a characteristic orientation to the fibre in the interface region. We assume the gas flow type and hence the exchange rate of matter and energy determines the film structure in this region. With increasing film thickness the (002) layers fold randomly in all directions or form nanocrystals at elevated temperatures.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002160051483

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2

Digitale Medien

Raman spectroscopy of C-, BN-, SiC-layers deposited on multifilament substrates (1999)

Meyer, N. ; Nestler, K. ; Stöckel, S. ; [weitere]

Springer

Fresenius' journal of analytical chemistry 365 (1999), S. 133-135

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ISSN: 1432-1130

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The analytic characterisation of various layers and layer systems on fibrous materials are presented. The layers, deposited by an isothermal CVD process, consisting mainly of pyrolytic carbon, hexagonal boron nitride and silicon carbide were characterised by different analytical methods, especially by Raman spectroscopy [1]. The surface enhanced Raman spectroscopy (SERS) was used first time for the investigation of boron nitride (BN) coatings on fibres.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002160051458

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3

Digitale Medien

Transmission electron microscopic investigations on SiC- and BN-coated carbon fibres (1996)

Dietrich, D. ; Martin, P. W. ; Nestler, K. ; [weitere]

Springer

Journal of materials science 31 (1996), S. 5979-5984

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ISSN: 1573-4803

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau

Notizen: Abstract Carbon fibres were coated with layers of silicon carbide (SiC) and boron nitride (BN) by conventional chemical vapour deposition. The SiC films were deposited by thermal decomposition of methyltrichlorosilane, whereas the BN films were deposited using the stepwise disproportion reaction of boron chloride with ammonia. Samples for electron microscopic investigations were prepared by separating film from fibre or by conventional mechanical thinning and subsequent ion milling of cross sections of coated fibres. Bright- and dark-field images of both planar and cross-sectional electron microscopic investigations on the fibre coatings gave detailed information on film thickness and morphology. High-resolution images improved the structural information of electron diffraction patterns. Crystal dimensions in the SiC film vary between 10 and 40 nm. Electron diffraction revealed the crystal structure to be a mixture of disordered hexagonal 2H-SiC and cubic β-SiC. High-resolution images showed the (1 1 1)-planes to be preferred for deposition. In BN films, a hexagonal turbostratic structure similar to turbostratic carbon was observed. Apart from amorphous regions, nanocrystalline parts were detected, which have a higher structural perfection in the stacking sequence of their (0 0 2)-planes compared to the (0 0 2)-planes of the turbostratic carbon fibre. High-resolution images located the film-fibre interface that was confirmed by electron energy loss spectroscopy.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01152148

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4

Digitale Medien

Production and characterization of C and SiC layers on C fibres (1993)

Marx, G. ; Martin, P. W. ; Meyer, N. ; [weitere]

Springer

Fresenius' Zeitschrift für analytische Chemie 346 (1993), S. 181-185

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ISSN: 1618-2650

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Summary The construction, testing and operation of a semi-technical system for the multi-stage coating of endless fibres by means of thermally-activated CVD is described. One objective of this is to apply layer systems under conditions similar to those used in production with long-term reproducibility. Rovings coated in this way, for example, are made of high-tensile carbon fibres, and used as reinforcing components in the manufacture of modern composite materials. Research programs and laboratory test batches are characterized extensively by methods of surface and solid state analysis such as SEM, TEM, AES, XPS and RAMAN. Analytical investigations are supplemented by strength measurements made at several sites on the fibre coating and on the later application.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00321409

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