Porosity and Micro-Hardness of Shrouded Plasma Sprayed Titanium Coatings


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Titanium and its alloys are often used as key materials for corrosion protection. A promising approach to optimize both mechanical properties and corrosion resistance is the use of coating technologies. In this paper, shrouded plasma spray was used as a useful technology to produce low oxide containing titanium coatings. A solid shroud was used to plasma spray titanium coatings to reduce the oxide content. The titanium coatings were assessed by optical microscope, scanning electron microscopy and Vickers microhardness testing. The results showed that the shrouded titanium coatings exhibited an enhanced microstructure. The presence of the shroud and shroud gas flow led to a significant reduction in coating porosity because the reduction in air entrainment with the shroud resulted in better heating of the particles. The shrouded titanium coatings had a lower value of Vickers microhardness and a relative lower standard deviation than the air plasma sprayed titanium coatings.



Edited by:

Henry Hu and Gu Xu




H. Zhou, "Porosity and Micro-Hardness of Shrouded Plasma Sprayed Titanium Coatings", Key Engineering Materials, Vol. 793, pp. 73-77, 2019

Online since:

January 2019





[1] C. Leyens and M. Peters: Titanium and titanium alloys (Wiley-VCH GmbH, 2003).

[2] R. Boyer: Mater. Sci. Eng., Vol. A213 (1996), p.103.

[3] R. Boyer, G. Welsch, E. Collings: Materials properties handbook (ASM international,1994).

[4] H. Zhou, B. Gabbitas, S. Mathews: Proceedings of the 12th World Conference on Titanium, Vol.3 (2011), p.1287.

[5] K Luthra: Oxidation of Metals, Vol. 36 (1991), p.475.

[6] S. Taniguchi, T. Shibata and S. Itoh: Materials transaction, Vol. 32 (1991), p.151.

[7] P. Fauchais, M. Vardelle, S. Goutier: J. Thermal Spray Technology, Vol. 25 (2016), p.1534.

[8] P. Fauchais, G. Montavon, G. Bertrand: J. Thermal Spray Technology, Vol. 19(2010), p.56.

[9] H. Zhou, Z. Liu, L.Luo: MATEC Web of Conferences, Vol. 142(03006) (2018), p.1.

[10] M. F. Morks, C.C. Berndt: Applied Surf. Sci., Vol. 256 (2010), p.4322.

[11] S. Kim, S. Choi, G. H. Kim, S. H. Hong: Thin solid film, Vol. 518 (2010), p.6369.

[12] M.P. Planche, H. Liao, C. Coddet: Surf. Coat Technol., Vol. 202 (2007), p.69.

[13] I. Thomson, V. Pershin, J. Mostaghimi, S. Chandra: Plasma Chemistry and Plasma Processing, Vol. 21 (2001), p.65.

DOI: https://doi.org/10.1023/a:1007041428743

[14] S Matthews: Surface and coating technology, Vol. 249 (2014), p.56.

[15] M. Jankovic, J. Mostaghimi, V. Pershin: J. Thermal Spray Technol., Vol. 9 (2000), p.114.