Publicado

2017-10-01

Mejoramiento de la adherencia en recubrimientos de Hidroxiapatita elaborados mediante proyección térmica oxiacetilénica, a partir de resultados de simulación numérica

Improvement of the adhesion on Hydroxyapatite coatings produced by oxyfuel thermal spray from results of numerical simulation

DOI:

https://doi.org/10.15446/dyna.v84n203.59201

Palabras clave:

Hidroxiapatita, Proyección térmica, Simulación, Sommerfeld, Adherencia (es)
Hydroxyapatite, Flame Spray, Simulation, Sommerfeld, Adhesion (en)

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Los resultados de la simulación numérica realizada con el software Jets et Poudres fueron utilizados para depositar recubrimientos de hidroxiapatita mediante proyección térmica oxiacetilénica, con el fin de aumentar su cohesión y adhesión sobre sustratos de Ti6Al4V. Se determinó el efecto de una llama neutra, una oxidante y una súper-oxidante, así como de la distancia de proyección (7, 9,5 y 12 cm) entre el sustrato y la antorcha, sobre el número adimensional de K-Sommerfeld (K). Dicho número adimensional es influenciado por la distancia de proyección y no por las llamas evaluadas. Para recubrimientos fabricados a una distancia de 12 cm el número de Sommerfeld varía entre 34 y 37, lo que les confiere una estructura más homogénea que la de aquellos depositados a 7 y 9,5 cm en los que existe un alto contenido de partículas parcialmente fundidas (K=0), o con salpicaduras (K>75), que reducen la adhesión de los recubrimientos.
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.

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[1]
“Mejoramiento de la adherencia en recubrimientos de Hidroxiapatita elaborados mediante proyección térmica oxiacetilénica, a partir de resultados de simulación numérica”, DYNA, vol. 84, no. 203, pp. 170–176, Oct. 2017, doi: 10.15446/dyna.v84n203.59201.