Banca de DEFESA: PAULO HENRIQUE CHIBÉRIO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAULO HENRIQUE CHIBÉRIO
DATE: 05/11/2021
TIME: 09:00
LOCAL: meet.google.com/kap-apup-rxo
TITLE:

Incorporation of Boronnitride and niobium carbide in a alumina matrix 

KEY WORDS:

Alumina. Niobium carbide. Boron nitride. 

PAGES: 13
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Cerâmicos
SUMMARY:

In research and manufacture of new advanced ceramics and occurs seems to favor the use of high post-purity and ultrafine combined with less time and lower sintering temperature. This faster process with lower temperatures can be used as a new way to produce ceramic cutting tools, usually produced with aluminum oxide (Al₂O₃) as the only material, or with the addition of metal carbides in its matrix to improve its properties, such as: Niobium carbide (NbC), Silicon carbide (SiC) and tungsten carbide (WC). Another material that has been used in the machining industry is Boron nitride (BN), as it has a high melting point (2800K) which is a very important parameter for the material used at the tip of the cutting tool. Aiming at new forms of cutting tool production, the Tape Casting technique was used for manufacturing, thus being able to obtain complex geometries and desired thicknesses. The present work has as general objective to study how properties and mechanics of ceramic composites of alumina incorporated with Boron Nitride and Niobium Carbide. The work was carried out with two different types of, a group was built from SPS, this being the composite of Al₂O₃ + 30% wt of NbC, sintered at 1350,1400 and 1450 °C; the other group was included via Tape Casting, where h-BN (3, 5 and 10 %) was incorporated into the ceramic alumina matrix. As green ribbon, laminates were awarded, these were mainly calcined at 500 °C with a heating rate of 1 °C / min and subsequently sintered at 1500, 1550 and 1600 °C. The results obtained, for the samples produced by SPS, showed to be promising, showing good properties at lower temperature and sintering time. The results of samples obtained via Tape Casting demonstrated that BN does not significantly contribute to improvements in the mechanical properties of nanocomposites.

BANKING MEMBERS:
Interno - 1149564 - WILSON ACCHAR
Externo à Instituição - Antonio Carlos Silva da Costa - UFRN
Externo à Instituição - CLAWSIO ROGERIO CRUZ DE SOUSA - UFERSA
Externo à Instituição - HUGO PLÍNIO DE ANDRADE ALVES