Banca de DEFESA: MILTON TELES NETO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MILTON TELES NETO
DATE: 09/12/2022
TIME: 19:00
LOCAL: REMOTA
TITLE:

Analysis of optical properties of Ni/NiO coatings with applications in receiver tubes of parabolic trough collectors.

KEY WORDS:

selective surfaces, concentrating collectors, solar energy, electrolytic deposition.

PAGES: 102
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Processos de Fabricação
SUMMARY:

This work aimed to produce and characterize selective Ni/NiO surfaces using stainless steel as substrate. An electrodeposition was performed at five different time intervals: 30s, 60s, 90s, 120s, 150s. The samples were taken to the muffle furnace, the time for performing the heat treatment was set at 0.5 hours and the temperature at 450°C. From the optical microscopy, it was possible to perceive that the samples that underwent an electrodeposition for a longer time presented a greater amount of NiO. In the analyzes carried out in SEM, it was possible to notice that the increase in time in the electrolytic deposition process allowed the formation of a more homogeneous thin film. The smallest thickness is seen in sample 1A with (1.43 ± 0.043) μm, while the largest was expressed by part 5B, (3.60 ± 0.11) μm. The roughness values are inversely proportional to the electrodeposition time. The hardness test showed that working conditions 4A, 4B, 5A and 5B presented the highest hardness. Samples 4A and 4B showed the highest selectivity factor, with values of 6.92 and 6.61. On the other hand, parts 1A and 1B presented a factor of 4.50 and 4.56, respectively.

BANKING MEMBERS:
Externo à Instituição - LUÍS ANTÔNIO BORTOLAIA - UFOP
Interno - FREDERICO ROMAGNOLI SILVEIRA LIMA
Presidente - WAGNER SADE