Banca de DEFESA: VINÍCIUS SOARES MEDEIROS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : VINÍCIUS SOARES MEDEIROS
DATE: 02/03/2020
TIME: 10:30
LOCAL: Sala de aulas do PPGCEM
TITLE:

Production and Characterization of Rice Hull Ash Vitroceramics

KEY WORDS:

rice husk ash; glass; glass ceramic; recycling; waste from the rice industry.

PAGES: 85
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

In the production of industrial wastes, and agricultural land is one of the most pressing problems at the time in the world. Increasingly, the wastes are to be characterized as a material that has the capacity to generate wealth, which can then be used in the production of ceramic materials. The procedure of processing that generates as a waste product of the rice husk which is used as a source of energy, it is the grey of the hull of the rice, and the incorporation of this ash in the production of new products, in particular ceramics, and glass-ceramics. The main objective of this study was to develop a glass-ceramic from this natural source, the rice husk ash (RHA) is used as the source of the silica from the waste stream in the industry. The formulation used in SiO₂-Al₂O₃-CaO-Na₂O-K₂O-MgO was adjusted by means of the composition of a glass-ceramics (DE MIRANDA (2015) by replacing the source of the silica in the same thing. A mixture of 23g of these compounds was melted at 1500ºC for 1 hour, to obtain a glass-precursor, where it was subjected to the analysis of XRX, XFR, DIL and TGA to the characterization of glass and glass-ceramic. Subsequently, they were sintered for three samples of glass, with a temperature of 850ºC 5°C/min, while varying the amount of time between 30 and 40 minutes.Through the analysis of dilatométrica, it was possible to obtain the coefficient of thermal expansion for the glass, which was de -9,54231  and the glass-ceramic cooking surface have been obtained, and the values for samples CA-GC1, the CA-GC2 and CA-GC3 2,34938 , -3,46648  e -2,76026 , respectively. Through the analysis of dilatométrica, it was possible to obtain the coefficient of thermal expansion for the glass, which was de -9,54231  and the glass-ceramic cooking surface have been obtained, and the values for samples CA-GC1, the CA-GC2 and CA-GC3 2,34938 , -3,46648  e -2,76026 , respectively. The structure of the glass-ceramic obtained has been analyzed by XRD, being by demonstrating the presence of crystalline phases, the Nepheline (), and Diopside . The results obtained from the SEM images confirmed the presence of crystalline phases and on the EDS, there was the acknowledgement of the constituent elements of the composition that is used.

 

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