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Abstract
Eddy current (EC) methodology has been developed for non-destructive assessment of thickness of Silicon carbide (SiC) coating on carbon-carbon (C/C) composite specimens. For coating, polymer precursor route has been employed and approximate coating thickness has been determined by weight gain method. EC probe signal amplitude has been measured before and after the coating. Despite scatter in the baseline data due to surface roughness on C/C specimens, EC methodology could identify undercoated (thickness <20 µm) specimens. A calibration graph has been established between EC signal amplitude and coating thickness (weight gain) to evaluate the performance of the EC methodology. The methodology has evaluated the coating thickness with error less than ±5 µm. Studies confirm that it is possible to assess the efficacy of coating process and to readily identify thinly coated regions using eddy current imaging.
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References
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- Forsberg, C.W., Burchell, T.D., Williams, D.F., Holcomb, D.E., Holdaway, R.F. and Qualls, A.L., "Carbon-Carbon Composite Salt-cooled, Electric Space Reactors", Proceedings of the Space Nuclear Conference 2005, San Diego, California, Paper No.1148, June 5-9, 2005.
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References
Manocha, L., "High Performance Carbon-carbon Composites", Sadhana, Vol.28, Nos.1 and 2, pp.349358, Feb. 2003.
Forsberg, C.W., Burchell, T.D., Williams, D.F., Holcomb, D.E., Holdaway, R.F. and Qualls, A.L., "Carbon-Carbon Composite Salt-cooled, Electric Space Reactors", Proceedings of the Space Nuclear Conference 2005, San Diego, California, Paper No.1148, June 5-9, 2005.
Crostack, H.A., "NDT of Coatings, Surface Modified Layers and Adhesives", Encyclopedia of Materials Science and Technology, Mechanical, Testing and NDT, Elsevier, UK, pp.409-410, 2000.
RothDon, J., Jacobson, S.N., Gray, N.J., Cosgriff, M.L., Bodis, R.J., Wincheski, A.R., Rauser, W.R., Burns, A.E. and Mcquater, S.M., "NDE for Characterizing Oxidation Damage in Reinforced CarbonCarbon", Proceedings of Ceramic Engineering and Science, Vol.26, No.2, pp.133-141, 2005.
Srivastava, V.K., Udoh, A., Maier, H.P., Knoch, P. and Maile, K., "Eddy Current Nondestructive Mapping of C/C-SiC Composites", Forschung im Ingenierurwesen, Vol.68, pp.169-172, 2004.
Wincheski, B. and Simpson, J., "Application of Eddy Current Techniques for Orbiter Reinforced CarbonCarbon Structural Health Monitoring", Review of Progress in QNDE, Vol.820, pp.1082-1089, March
Yin, W., Withers, P.J., Sharma, U. and Peyton, A.J., "Non-contact Characterization of Carbon-fibre-reinforced Plastics Using Multi-frequency Eddy Current Sensors", Proceedings of the Instrumentation and
Measurement Technology Conference - IMTC 2007, Warsaw, Poland, 1-3 May, 2007.
Grigoriev, D.A., Edirisinghe, M.J., Bao, X., Evans, J.R.G. and Luklinska, Z.B., "Preparation of Silicon
Carbide by Electrospraying of a Polymer Precursor", Philosophical Magazine Letters, Vol.81, No.4,
pp.285-291, 2001.
Rao, B.P.C., "Practical Eddy Current Testing", Narosa Publishing House, ISBN: 978-81-7319-714-
, 2007.
Baldev Raj., Jayakumar. T. and Rao, B.P.C., "Nondestructive Test Techniques for Assessment of
Cracks", Journal of Aeronautical Society of India, Vol.46, No.3, August, 1994, pp.101-115.