Development of Thermal Spray System of Ceramic Powder - using plasma torch of long arc

Reference Presenter Authors
14-076 Roberson José da Silva da Silva, R.J.(Instituto Tecnológico de Aeronáutica); Rita, C.C.(Instituto Tecnológico de Aeronáutica); Maciel, H.S.(Instituto Tecnológico de Aeronáutica); Petraconi Filho, G.(Instituto Tecnológico de Aeronáutica); Thermal plasma spray is a technique for coating thick films by scattering at high speed of metalic or ceramic powder, that its molten at high temperature, on a surface where they solidify to form a layer. The purpose of this process is to obtain layers of high thermal resistance and mechanical ablation, which confers high melting point with the lowest possible substrate compromise. Conventional systems use plasma torches that operate with short arcs, currents in the order of hundreds of amps and tens of volts. This work shows the development of a thermal plasma spraying system using a reverse vortex plasma torch, which works with longer arcs, currents of the order of a hundred ampères, and some hundreds volts. It is presented the studies to obtain the necessary heat for the melting of SiO2 powder, the control of spraying and details of the process until obtaining the ceramic coating.
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