Banca de DEFESA: LARISSA BEZERRA DA SILVA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LARISSA BEZERRA DA SILVA
DATA : 25/03/2019
HORA: 09:00
LOCAL: A definir
TÍTULO:

Development of Ceramic with high Sinterability based on Nano Alumina reinforced with CBC produced by tape casting

PALAVRAS-CHAVES:

CBC, Alumina, Sintering aid, Densification.

PÁGINAS: 120
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Cerâmicos
RESUMO:

The current trend in the research and manufacture of new advanced and structural ceramics seems to favor the use of high purity and ultrafine powders combined with shorter sintering time and lower sintering temperature. Compositions with oxides aides (Cu2O, CuO, TiO2, MgO, B2O3, SiO2, K2O, Na2O, Li2O, ZrO2, ZnO) and the sugarcane bagasse ashes waste (CBC) were prepared with alumina to evaluate the effect of the sintering, density, hardness and microstructural. Thereafter ceramic tapes were produced by tape casting with the most promising formulation. Almost all of the composites showed densification below 1100 ° C. Higher density values (~ 95%) were obtained for compositions based respectively on borosilicate (F3 and F7) and soda lime glass (F8) containing Na on the precursor in powder, and F1, F2, F3 having TiO2 and Cu2O as precursors, and finally the composition with 10% of the ash from the sugarcane bagasse waste. Samples F5 (based on K), F9 (without K or Na in the powder precursor of glass) and F4 presented irregular morphology with the presence of intergranular porosity. The compositions F6, F7 and F8 presented uniform morphology corresponding to densification. And finally, from the mixture of alumina with CBC (AR) waste with addition of reinforcing particles and sintered at 1200ºC was chosen for the production of ceramic tapes. The ceramic suspension showed a decrease in viscosity with increasing shear rate, which characterizes a pseudo plastic behavior, allowing the production of tapes with homogeneous and flat surfaces. The average from the bending test value was 20.14 MPa for the 6 layer laminates.

MEMBROS DA BANCA:
Externa à Instituição - Ana Paula da Silva Peres - UFRN
Externo à Instituição - Antonio Carlos Silva da Costa - UFRN
Externa à Instituição - MICHELINE DOS REIS ARAÚJO - UFRN
Externa à Instituição - SHEYLA KAROLINA JUSTINO MARQUES - IFAl
Presidente - 1149564 - WILSON ACCHAR