Preparation and characterization of CVD-TiN-coated carbon fibers for applications in metal matrix composites

Abidin Alfaferi , Rafał Kozera , Höhn Mandy , Endler Ingolf , Knaut Markus , Anna Boczkowska , Czulak Andrzej , Malczyk Piotr , Natalia Sobczak , Michaelis Andreas

Abstract

"Aluminum matrix composites reinforced with carbon fibers (CF/Al-MMC) are promising materials for lightweight applications. So far the application has been hindered by a lack of wettability of carbon fibers by aluminum alloys and detrimental reactions like aluminum carbide (Al4C3) formation. Protective coatings prepared by chemical vapor deposition (CVD) could be a suitable way to overcome these problems. In this work carbon fiber based 3D-textile preforms were coated with titanium nitride (TiN). Coating thickness, homogeneity, layer structure and composition were determined. Furthermore oxidation resistance and tensile strength of coated fibers were investigated. The wettability by molten aluminum combined with an interface analysis is examined on TiN-coated graphite substrates. Finally the quality of MMC parts prepared by gas pressure infiltration (GPI) method is evaluated. The CVD process was performed with a gas mixture of TiCl4, N2 and H2. A homogeneous coating was achieved at moderate deposition temperatures in the range from 800° to 850 °C and by proper adjustment of further process parameters as TiCl4 concentration and total pressure. A very thin TiN layer with a thickness between 30 nm and 35 nm improves the oxidation resistance and results in a moderate decrease of the tensile strength. TiN improves the wettability and acts as a protective coating. However because of the long infiltration time in the GPI process, interface reactions occur. SEM investigations of TiN coated 3D-textile preforms infiltrated with AlSi9Cu3 alloy (226D) show a completely dense composite with a strong reduction of the Al4C3 formation. TiN offers a good protective effect if the contact time with the melt is not too long."
Author Abidin Alfaferi
Abidin Alfaferi,,
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, Rafał Kozera (FMSE / DSMP)
Rafał Kozera,,
- Division of Ceramic Materials and Polymers
, Höhn Mandy
Höhn Mandy,,
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, Endler Ingolf
Endler Ingolf,,
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, Knaut Markus
Knaut Markus,,
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, Anna Boczkowska (FMSE / DSMP)
Anna Boczkowska,,
- Division of Ceramic Materials and Polymers
, Czulak Andrzej
Czulak Andrzej,,
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, Malczyk Piotr
Malczyk Piotr,,
-
, Natalia Sobczak
Natalia Sobczak,,
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, Michaelis Andreas
Michaelis Andreas,,
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Journal seriesThin Solid Films, ISSN 0040-6090, (A 30 pkt)
Issue year2015
Vol589
Pages479–486
Keywords in English"CF/Al-MMC Lightweight CVD TiN 3D-textile preform and GPI"
Languageen angielski
Score (nominal)30
ScoreMinisterial score = 30.0, 28-11-2017, ArticleFromJournal
Ministerial score (2013-2016) = 30.0, 28-11-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2015 = 1.761 (2) - 2015=1.79 (5)
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