Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
MORPHOLOGICAL STUDY AND CHEMICAL COMPOSITION CERAMIC MATERIALS TESTED UNDER HYPERSONIC FLOW PLASMA CONDITIONS
Submission Author:
Cristian Cley Paterniani Rita , SP
Co-Authors:
Cristian Cley Paterniani Rita, FELIPE MIRANDA, Alexei Essiptchouk, GILBERTO PETRACONI
Presenter: Cristian Cley Paterniani Rita
doi://10.26678/ABCM.COBEM2019.COB2019-2341
Abstract
Mullite is a ceramic composed of silicon oxide and aluminum used in various technological applications due to its physical and chemical properties, such as: Low thermal expansion, high thermal stability, low density, low thermal conductivity, good mechanical resistance and creep resistance, good stability in severe chemical environments, among other properties. The supersonic plasma wind tunnel was optimized to investigate the ablative properties of the ceramic composite coating – Mullite (3〖Al〗_2 O_3.〖2SiO〗_2 ) deposited by the spray plasma process on Carbon-Carbon substrate (C/C). The tests were performed at low pressure in a reactive air plasma using a DC non-transferred arc plasma torch with enthalpies of 7.2MJ/kg at 18.5MJ/kg and heat fluxes of 0.52 MW/m2 to 2.2 MW/m2. The specific mass loss rate of the coated Mullite on the (C/C) was evaluated as a function of the exposure time and of the heat flow. Microstructural and chemical analysis of the (C/C) substrate of the coated mullite before and after the ablation process through SEM/EDS were also performed. The analysis of the results showed that the adhesion of the mullite is directly related to the exposure time of the substrate (C/C) in the spray plasma process, in the formation of the coating as a protective layer.
Keywords
Plasma Wind Tunnel, ceramic materials, Plasma Jet, Hypersonic Flow, Hypersonic Plasma Torch
