Banca de DEFESA: MORENA BRITO DE FARIAS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MORENA BRITO DE FARIAS
DATE: 02/03/2020
TIME: 07:30
LOCAL: Sala de aulas do PPGCEM
TITLE:

Obtaining diopside and nepheline glass-ceramic using coffee husk ash (CCC)

KEY WORDS:

glass, glass-ceramic, residue, coffee husk ash.

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

Glass-ceramic materials are produced from original glass by controlled crystallization, in which it is possible to obtain a material with certain properties due to its microstructural control. These materials have a wide range of applications such as cooktops, ceramic tile enamels, insulators, sealants when applied to solid oxide fuel cells (SOFCs), glass-ceramic enamels and/or biomaterial. In this study, the production of the glass-ceramic material was obtained through the homogenization of the base glass reagents that will go through the process of casting, maceration, compaction, and crystallization in the oven. One of the reagents used in the work was potassium oxide, produced through coffee husk ash (CCC), as it is a low-cost material, of great production in the country and of possible reuse, considering that this material is very sometimes disposed of improperly. The material in question was characterized by X-ray Diffraction, X-ray Fluorescence, Dilatometry and Field Emission Scanning Electron Microscopy. The analyzes indicated the formation of the Diopside and Nepheline crystalline phases. The coefficients of thermal expansion (CTE) of glass and glass-ceramic have values between 9.17-1.8 x 10^-6 ºC^-1. However, in the results of the SEM-FEG analysis of the CC_GC1 sample, a porous glass-ceramic was observed, where the existing pores have a circular shape, arranged at random. However, it was possible to obtain a glass-ceramic material using coffee husk ash as a K₂O substitute reagent.

BANKING MEMBERS:
Presidente - 1350249 - RUBENS MARIBONDO DO NASCIMENTO
Interno - 1300987 - CARLOS ALBERTO PASKOCIMAS
Externa à Instituição - AURISTELA CARLA DE MIRANDA - UFPB
Externo à Instituição - DANIEL ARAÚJO DE MACEDO - UFPB