Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Hollow cathode discharge for absorber film deposition
Submission Author:
Gustavo César Pamplona de Sousa , PB
Co-Authors:
Gustavo César Pamplona de Sousa, Kelly Cristiane Gomes, Clodomiro Alves Junior
Presenter: Gustavo César Pamplona de Sousa
doi://10.26678/ABCM.COBEM2021.COB2021-0182
Abstract
The solar thermal collectors have limitations associated with the fact that the higher the temper-ature of the solar collector, the greater the amount of heat emitted by radiation. The use of selective surfaces is one of the alternatives found to increase radiation absorption and, above all, to reduce thermal emission losses. Considering that radiation absorption is a surface phenomenon of the material, many techniques are being studied for the deposition of the material, with favorable optical properties, on the substrate. The present study is aimed at produce selective coatings with high absorption in UV/Vis range, composed of ilmenite deposited on AISI 304 stainless steel substrates and aluminum substrates, using cathodic cage plasma nitriding/deposition technique for application in solar thermal absorbers. Ilmenite was initially characterized by X-Ray Fluo-rescence (XRF), X-Ray Diffractometry (XRD) and Thermal Analysis (TGA). The coatings produced were optically characterized in range UV/Vis, the microstructural evaluation of coatings by Scanning Electron Microscopy (SEM) and data on them roughness parameters of the films produced were obtained by Optical Profilometry. Uniform selective surfaces with high solar absorbance (87%) were obtained in the ilmenite samples deposited on stainless steel substrate, but the material was not deposited in the aluminum substrates in a satisfactory manner.
Keywords
hollow cathode deposition, selective surfaces, solar absorbers, Ilmenite
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