Structure and properties of plasma sprayed APS -Ni20Al coatings
Abstract
The aim of this study is to obtain, by optimizing the deposit parameters, optimal structural and mechanical properties of Ni20Al layers to be applied on a radar station part. The powder was deposited by the process of atmospheric plasma spraying (APS), with a plasma spray (PS) distance of 80, 90 and 100 mm. The coating with the best characteristics was deposited on the hardener of the GTD 2PV8 turbo gas engine for a radar station, in order to reduce the effect of oxidation and vibration on the wear at 450 - 500°C. The quality of Ni20Al coating layers was assessed on the basis of their microstructure, microhardness and tensile strength. The best structure and mechanical properties were found in the layers deposited with a distance of plasma spray of 80 mm. The surfaces morphology of the deposited coatings and the fracture morphology of the best layers were examined with the SEM (scanning electron microscope). The microstructure of the deposited layers of coatings was examined by light microscopy. The microstructural analysis of the deposited layers was performed according to the Pratt-Whitney standard. The evaluation of the mechanical properties of the layers was done by examining microhardness with the HV0.,3 method and tensile testing was used for the bond strength. Studies have shown that the plasma spray distance significantly affects the mechanical properties and the microstructure of coatings. The effect of Ni20Al coating application has been tested on a hardener of the GTD 2PV8 turbo gas engine on a radar station.
References
ASM Handbook, 1992, Volume 3, Alloy Phase Diagrams, ASM International, Metals Park.
Cahn, R.W., 1991, Load-Bearing Ordered Intermetallic Compounds – A Historical View, MRS Bulletin, 5, pp.18–25.
Chen, J.Z., Herman, H. and Safai, S., 1993, Evaluation of NiAl and NiAl-B Deposited by Vacuum Plasma Spray, J. Thermal Spray Technology, 2, pp.357–363.
Deevi, S.C., Sikka, V.K., Swindeman, C.J. and Seals, R.D., 1997, Reactive Spraying of Nickel-Aluminide Coatings, Journal of Thermal Spray Technology, 6(3), pp.335-344.
Hashemi, S.M., Enayati, M.H. and Fathi, M.H, 2009, J.Therm. Spray. Technnol.,18, 284.
Hiemann, R.B., 1996, Plasma – Spray Coating – Principles and Applications, VCH Publishers Inc., New York, USA.
Knotek, O., and Lugscheider, E., 1976, Therrnoanalysis of Nickel Aluminum Spraying Powders, Proceedings of Eighth International Thermal Spray Conference, Miami Beach, pp.244-251.
Knotek, O., Lugscheider, E. and Cremer, K.H., 1980, Alumina and Alurninide Formation in Nickel Aluminum Spraying Powders, Proceedings of Ninth International Thermal Spray Conference, The Hague, pp.282-286.
Kumar, S. and Selvarajan, V., 2006, Chem. Eng. Process., 45, 1029.
Liu, C.T. and White, C.L., 1985, High Temp. Ordered Intermetallic Alloys, Mat. Res. Soc., 39, pp.365–371.
Lee, N.Y., Stinton, D.P., Brandt, C.C., Erdogan, F., Lee, Y.D. and Mutasim, Z., 1996, J.Am. Cer. Soc., 79, 12, pp.3003–3009.
Liu, C.T. and Sikka, V.K., 1986, Nickel Aluminides for Structural Uses, J. of Metals, 38, pp. 13 –16.
Material Product Data Sheet, 2011, Metco 404 NS 80% Nickel / 20% Aluminum Shemically Clad Powder, MSDS No 50 – 161, Sulzer Metco.
McPherson, R., and Cheang, P., 1989, Microstructural Analysis of Ni-Al Plasma Sprayed Coatings, r Proceedings of Twelfth International Thermal Spray Conference, London, The Welding Institute, P17-1 - P17-1O.
Moshksar, M.M., and Mirzaee, M., 2004, Intermetallics, 2004, 12, 1361.
Rosso, M., and Bennani, A., 1998, PM World Congress Thermal Spraying/Spray Forming, Granada, Spain, October, pp. 524–530.
Sampath, S., Gudrnundsson, B., Tiwari, R., Herman H., 1990, in Proc. Third National Thermal Spray Conf., Long Beach, CA, USA, 357.
Turbojet Engine – Standard Practices Manual (PN 582005)(2002), Pratt & Whitney, East Hartford, USA.
Proposed Creative Commons Copyright Notices
Proposed Policy for Military Technical Courier (Journals That Offer Open Access)
Authors who publish with this journal agree to the following terms:
Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).