Effect of Air Plasma Spraying Parameters on the Quality of Coating

Abstract

In this study, air plasma spraying (APS) has been used to produce a cermet’s composite coating based on powder of ceramic oxides (Al₂O₃-3%wtTiO₂) reinforced by mineral powders as bonding material (Ni-20%wtCr6Al) at different rates onto AISI 304 stainless steel substrates. Coating deposition by plasma spraying involves a number of process variables such as powder flow rate, electric current and standoff-distance., which participate in a large way to the best quality of the coating. The obtained results showed that a higher spraying power and a shorter spraying distance result in the higher deposition efficiency, the better microstructure and the higher micro-hardness for the coating. It is concluded that the spraying power and distance are important factors influencing the deposition efficiency, microstructure and micro-hardness of the plasma sprayed (Al₂O₃-3% wt TiO₂) coating.

Keywords

• Air Plasma Spraying (APS),Process Variables,coating,Microstructure

Kaynakça

1. [1] M. Cadenas, R. Vijande, H. I. Montes, I. M. Siena, Wear: behavior of laser cladded plasma sprayed WC-Co coatings, Wear 212 (1997) 244-253.
2. [2] M. Wang, L. L. Shaw, Effects of the powder manufacturing method on microstructure and wear performance of plasma sprayed alumina–titania coatings,Surface and Coatings Technology,202 (2007)1,34–44.
3. [3] P. Ctibor , P. Boháč, M. Stranyánek, R. Čtvrtlík, Structure and mechanical properties of plasma sprayed coatings of titania and alumina, Journal of the European Ceramic Society 26 (2006) 3509–3514.
4. [4] M. F. Morks, K. Akimoto, The role of nozzle diameter on the microstructure and abrasion wear resistance of plasma sprayed image composite coatings, Journal of Manufacturing Processes 10 (2008) 1-5.
5. [5] S. T. Aruna, N. Balaji, J. Shedthi, V. K. W. Grips, Effect of critical plasma spray parameters on the microstructure, microhardness and wear and corrosion resistance of plasma sprayed alumina coatings, Surface & Coatings Technology 208 (2012)92–100.
6. [6] E. H. Jordan, M. Gell, Y. H. Sohn, D. Goberman, L.Shaw, S. Jiang, M. Wang, T. D. Xiao, Y. Wang, P. Strutt, Fabrication and evaluation of plasma sprayed nanostructured alumina–titania coatings with superior properties, Materials Science and Engineering A 301 (2001) 80-89.
7. [7] F.-I. Trifa, G. Montavon, C. Coddet, On the relationships between the geometric processing parameters of APS and the Al2O3–TiO2 deposit shapes, Surface and Coatings Technology 195 (2005) 54-69.
8. [8] A. R. M. Sahab, N. H. Saad, S. Kasolang & J. Saedon,. Impact of plasma spray variables parameters on mechanical and wear behaviour of plasma sprayed Al2O3-3% wt TiO2 coating in abrasion and erosion application, In Procedia Engineering 41 (2012) 1689-1695.

9. [9] D. Matejka, B. Benko, Plasma Spraying of Metallic and Ceramic Materials. 1989 John Wiley & Sons, United Kingdom.
10. [10] D. Wang, Z. Tian, L. Shen, Z. Liu, Y. Huang, Microstructural characteristics and formation mechanism of Al2O3–13 wt.% TiO2 coatings plasma-sprayed with nanostructured agglomerated powders, Surface and Coatings Technology 203 (2009) 1298-1303.