Resumo

COPETE, Hamilton et al. Improvement of the adhesion on Hydroxyapatite coatings produced by oxyfuel thermal spray from results of numerical simulation. Dyna rev.fac.nac.minas [online]. 2017, vol.84, n.203, pp.170-176. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v84n203.59201.

Numerical simulations were carried out by Jets et Poudres software, and the results obtained were used to deposit hydroxyapatite coatings through oxyfuel flame spraying process, in order to improve its adhesion onto Ti6Al4V substrates. The effect of a neutral, an oxidizing and a super-oxidizing flames, as well as the spray distance between the substrate and the torch (7, 9.5 and 12 cm), on dimensionless K-Sommerfeld (K) number was determined. The dimensionless number is highly influenced by the spraying distance, while an effect of the flame type was not evident. The Sommerfeld number in coatings manufactured at 12 cm is between 34 and 37 and the homogeneity in their structure is higher than in those sprayed at 7 and 9.5 cm, in which unmelted particles (K=0) or splashing (K˃75) were observed, decreasing the adhesion of coatings.

Palavras-chave : Hydroxyapatite; Flame Spray; Simulation; Sommerfeld; Adhesion..

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