Banca de QUALIFICAÇÃO: WENDEL ANDERSON DANTAS TEIXEIRA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : WENDEL ANDERSON DANTAS TEIXEIRA
DATA : 14/10/2016
HORA: 08:30
LOCAL: Sala de Aula PPGCEM
TÍTULO:

Influence of brazing  of WC 6% Co / H13 steel  using mechanical metallization

PALAVRAS-CHAVES:

metal-ceramic brazing, mechanical metalization, H13 steel

PÁGINAS: 101
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:

Metal-ceramic interfaces are present in oil well drilling operations, where tricone drill bits with hard ceramic inserts play an important role. The combination of cutting, crushing and breaking up of rocks results in the degradation of tricone drill bits by wear, total or partial rupture of the drill bit body or the ceramic inserts, thermal shock and corrosion. Also the improper pressfitting of the ceramic inserts on the bit body may cause its total detachment, and promote serious damages to the drill bit. The improvement on the production process of metal-ceramic interfaces can eliminate or minimize some of above-mentioned failures presented in tricone drill bits, optimizing their lifetime and so reducing drilling metric cost. Brazing is a widely established technique to join metal-ceramic materials, and may be an excellent alternative to the common mechanical press fitting process of hard ceramic inserts on the steel bit body for tricone drill bit. The metallization of ceramic surfaces is used to improve the wetting and adhesion of the M/C system, when a liquid phase is present during the brazing process. In this work, the effect of brazing temperature was studied on WC-6Co and H13 steel couples, using 72Ag28Cu eutectic based brazing alloys inside a furnace under high vacuum. Mechanical and microstructure caracterization of the interfaces produced was analysed by 3 point flexural tests, SEM-EDX and XRD techinques.d, and the interfaces produced were analysed by SEM-EDX. Better results for mechanical strenght were found for the systems brazed at 880ºC using AgCu eutectic braze alloy.

MEMBROS DA BANCA:
Interno - 2156996 - AUGUSTO JOSE DE ALMEIDA BUSCHINELLI
Externo ao Programa - 3057895 - JORGE CARLOS LOPES BRAS SILVA PEREIRA
Presidente - 1350249 - RUBENS MARIBONDO DO NASCIMENTO