SOUSA, G. C. P.; http://lattes.cnpq.br/7318485795901551; SOUSA, Gustavo César Pamplona de.
Resumen:
The world is moving at a fast pace in the consumption of non-renewable natural
resources, causing several ecological problems. In this context, alternative and
renewable sources of energy, such as solar energy, have gained prominence,
strengthening research involving the use of these forms of energy worldwide. Solar
thermal conversion is one of the simplest ways to harness the sun's energy. However,
there are limitations in its application, mainly related to processes that require higher
temperatures. Selective surfaces are the latest and most effective alternative for
thermosolar system improvement. Given this reality and aiming at regional
development, a selective surface was developed in this research, based on ilmenite,
abundant titanium ore in the state of Paraíba. The raw material was initially
characterized by X-ray Diffractometry (XRD), X-ray Fluorescence (FRX),
Transmittance Fourrier Transform Medium Infrared Spectroscopy (FTIR) and Thermal
Analysis (TGA, DTA and DSC) for evaluation of the potential of ilmenite as precursor
material of selective solar surfaces. Titanium ore was sieved and sintered in the pellet
methodology and deposited on 304 stainless steel and aluminum substrates. The
coatings produced in this research were prepared via hollow cathode deposition and
optically characterized in the ultraviolet, visible and infrared bands of the
electromagnetic spectrum. Microstructural evaluation of coatings by Scanning Electron
Microscopy (SEM) was also performed and data on the roughness parameters of the
films produced were obtained by Optical Profilometry. Thus, selective surfaces with
high solar absorbance, 86%, and low thermal emission, 14%, were obtained by
validating the potential of ilmenite to produce selective surfaces for thermal solar
collectors.