Banca de DEFESA: YARA FELICIANO GOMES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : YARA FELICIANO GOMES
DATA : 23/02/2018
HORA: 09:00
LOCAL: Auditório do CCET
TÍTULO:

Synthesis and Characterization of YInMnO blue pigment using the complex Polymerization Method (CPM)

PALAVRAS-CHAVES:

YInO₃, manganese, blue pigments, Convectional Solid State reaction, Complex Polymerization Method (CPM).

PÁGINAS: 100
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

The system YIn_1-x Mn_xO₃, a new bright blue inorganic pigment, discovered in 2009, notable bright blue pigment, used in the ceramic and paint industry applications. These pigments are promising to reflectivity, durability, energy saving and produced at low cost. This studied was divided into two stages: the first consisted of the validation of the complex polymerization method (CPM) in which the YIn_1-x Mn_xO₃ powders (x = 8, 12 and 16 mol%) were calcined at temperatures of 800 ºC, 900° C and 1000 ° C characterized by X-ray diffraction (XRD), Rietveld Method (MR), Scanning Electron Microscopy (SEM), Spectroscopy of Uv-vis and colorimetric system CIEL*a*b* confirmed the maximum absorption range of 400 to 520 nm for blue at the temperature of 900 ° C and 1000 ° C. The second stage confirmed the  XRD, MR results showed that powders synthesized temperatures at 1300 ° C have a single phase of YIn₂O₃, JCPDS (70- 133), hexagonal structure, and smaller crystallization peaks, also confirmed by MR. CIEL*a*b* showed that powders, when compared method through CPM and Solid State reaction, exhibit the same coloration at 1300 ° C, shown a change from light blue to deep blue. The CPM method demonstrated efficiency at low temperatures a brilliant blue color, reflecting more than 80%, the lower absorption in NIR infrared spectroscopy, less heat accumulation and, therefore, lower cooling costs (ie "cool pigments") the temperature of 1000 ºC, advantages for application at low temperatures, with energy and economic efficiency and, therefore, being promised use in the ceramic and paint industry.

MEMBROS DA BANCA:
Presidente - 1802888 - FABIANA VILLELA DA MOTTA
Externo ao Programa - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externo à Instituição - MARIA INES BASSO BERNARDI - USP
Interno - 1883170 - MAURICIO ROBERTO BOMIO DELMONTE
Externo à Instituição - THARSIA CRISTIANY DE CARVALHO COSTA - IFBA