Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
DEVELOPMENT OF A THERMAL SPRAY SYSTEM USING A LONG ARC PLASMA TORCH
Submission Author:
Roberson Silva , SP
Co-Authors:
Roberson Silva, FELIPE MIRANDA, Homero Maciel, GILBERTO PETRACONI
Presenter: Roberson Silva
doi://10.26678/ABCM.COBEM2019.COB2019-2088
Abstract
Thermal plasma spray is a technique for coating thick films by scattering of molten particles (metallic or ceramic powders) in high temperatures and velocities. That is, molted particles are accelerated towards the surface of the sample, where they are solidified to form a thick protect layer. This process is used to obtain layers of high thermal and mechanical resistance, which confers high protection in aggressive ambient, which are found, for example, in the reentry atmosphere or in turbine blades. Conventional systems use a plasma torch that operates with short arcs, currents in the order of hundreds of amperes and tens of volts. This work shows the development of a thermal plasma spraying system using a reverse vortex plasma torch, which works with long arc, currents of the order of a hundred amperes, and some hundreds of volts. The system characteristics and control parameters to obtain the necessary heat to melting the alumina powder, in order to obtain the ceramic coating are presented.
Keywords
ceramic coating, Plasma torch, powder spray, thermal shield, thermal spray
