Deposition of titanium on SiC fibres from chloride melts

Abstract

The present study examined the feasibility of producing titanium matrix composites based on a molten salt fibre coating process. It is demonstrated that sufficiently thick and coherent titanium coatings can be deposited on SiC fibres in LiCl-KCl-TiCl 2 at 700 K. One important aspect of the study was the behaviour of the substrate during electrolysis. Therefore, additional features related to carbon-coated SiC fibres and carbonaceous substrates in general are outlined. The morphologies and microstructures of electrolytically coated SiC fibres were investigated by scanning electron microscopy and compared to fibres coated by a physical vapour deposition technique. The cause and relevance of the growth failures that were observed in this study are also discussed.

Electrodeposition of titanium–vanadium alloys from chloride-based molten salts: influence of electrolyte chemistry and deposition potential on composition, morphology and microstructure

“…2). The shapes of the CV peaks of the redox reactions are found to be similar to those of the single-element systems (with VCl 3 in the case of ES 1 and ES 3 and with TiCl 2 in a previous study [28]). The steep reduction peak of the reaction (Ti 4+ /Ti 3+ ) can be explained by the formation (O3)…”

“…and dissolution (R3) of the insoluble product K 2 TiCl 6 [32], whereas V 2+ /V 3+ (O2/R2) and Ti 2+ /Ti 3+ (R1/O1) seem to be reversible reactions as was also observed in the singleelement systems [28,26].…”

“…The present study builds on the latter investigations and forms the next step towards the development of an electrodeposition process for Ti-Al-V alloys, in particular the most important and widely established titanium alloy Ti-6Al-4V [27]. Of secondary, such a process would provide an alternative for synthesis of titanium matrix composites [28]. To this end, the current investigation focuses on identifying suitable electrodeposition parameters for a controlled deposition of titanium and vanadium from LiCl-KCl-VCl 3 -TiCl 2 melts and the characterization of the obtained materials.…”

Developments in Titanium Research and Applications in Germany

“…Nevertheless, low amounts of nanocrystalline -phase can lead to an improved fatigue limit by about 60% compared to the solution treated state. The results show that strengthening of metastable -alloys by -phase distribution is feasible [30,24].…”

“…Such processes can be used for the production of monofilament reinforced titanium matrix composites [29]. The applicability has been demonstrated for titanium [30]. However, the full potential of titanium matrix composites cannot be exploited with a pure titanium matrix.…”