Next Article in Journal
Ti-SLActive and TiZr-SLActive Dental Implant Surfaces Promote Fast Osteoblast Differentiation
Next Article in Special Issue
Phase and Microstructural Correlation of Spark Plasma Sintered HfB2-ZrB2 Based Ultra-High Temperature Ceramic Composites
Previous Article in Journal
Electrodeposition of Vanadium Oxides at Room Temperature as Cathodes in Lithium-Ion Batteries
Previous Article in Special Issue
Effect of Si3N4 Addition on Oxidation Resistance of ZrB2-SiC Composites
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Coatings 2017, 7(7), 101; https://doi.org/10.3390/coatings7070101

Chemical Vapor Deposition of TaC/SiC on Graphite Tube and Its Ablation and Microstructure Studies

1
Directorate of Ceramics and CMCs, Defence Materials & Stores Research and Development Establishment, Defence Research and Development Organization, Kanpur 208013, India
2
Advanced Systems Laboratory, Defence Research and Development Organization, Hyderabad 500058, India
*
Author to whom correspondence should be addressed.
Received: 15 June 2017 / Revised: 8 July 2017 / Accepted: 10 July 2017 / Published: 13 July 2017
(This article belongs to the Special Issue Ultrahigh Temperature Ceramic Coatings and Composites)
Full-Text   |   PDF [6150 KB, uploaded 20 July 2017]   |  

Abstract

Tantalum carbide (TaC) and silicon carbide (SiC) layers were deposited on a graphite tube using a chemical vapor deposition process. Tantalum chloride (TaCl5) was synthesized in situ by reacting tantalum chips with chlorine at 550 °C. TaC was deposited by reacting TaCl5 with CH4 in the presence of H2 at 1050–1150 °C and 50–100 mbar. SiC was deposited at 1000 °C using methyl-tri-chloro-silane as a precursor at 50 mbar. At 1150 °C; the coating thickness was found to be about 600 μm, while at 1050 °C it was about 400 μm for the cumulative deposition time of 10 h. X-ray diffraction (XRD) and X-ray Photo-Electron Spectroscopy (XPS) studies confirmed the deposition of TaC and SiC and their phases. Ablation studies of the coated specimens were carried out under oxyacetylene flame up to 120 s. The coating was found to be intact without surface cracks and with negligible erosion. The oxide phase of TaC (TaO2 and Ta2O5) and the oxide phase of SiC (SiO2) were also found on the surface, which may have protected the substrate underneath from further oxidation. View Full-Text
Keywords: CVD; TaC/SiC; thremal shock; oxidation CVD; TaC/SiC; thremal shock; oxidation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Kumar, S.; Mondal, S.; Kumar, A.; Ranjan, A.; Prasad, N.E. Chemical Vapor Deposition of TaC/SiC on Graphite Tube and Its Ablation and Microstructure Studies. Coatings 2017, 7, 101.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Coatings EISSN 2079-6412 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top