Banca de QUALIFICAÇÃO: LUCAS PIRES DE PAIVA BARRETO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : LUCAS PIRES DE PAIVA BARRETO
DATE: 23/06/2023
TIME: 11:00
LOCAL: VIDEO CONFERENCIA
TITLE:

COMPARATIVE STUDY BETWEEN POLYCRYSTALLINE DIAMOND BODIES SINTERIZED VIA HPHT WITH DIFFERENT BINDERS (Nb and Ta)

KEY WORDS:

Powder Metallurgy, HPHT Sintering, Polycrystalline Diamond, Niobium, Tantalum.

PAGES: 72
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The wide range of applications of polycrystalline diamond (PCD) within the cutting and drilling tools industry is increasingly noticeable. Properties such as high hardness guarantee excellent performance for the application of these materials in this field. In this scenario, scholars around the world have been dedicated to studying the properties of PCD combined with various metal binders, in order to lower costs and reduce the use of traditional metals that are dangerous to the environment and human health. With this, the purpose of this work is to investigate the use of the HPHT route (high pressures and high temperatures) for the production of PCD bodies with non-traditional binder metals, which for this work were chosen Niobium and Tantalum, in order to give continuity of the group's research with these materials. The effect of different sintering temperatures (1650°C, 1750°C and 1850°C) was investigated for both compositions, and both the sintered and post-processed bodies (starter and ground mix) were tested with Scanning Electron Microscopy (SEM), Microscopy Confocal, Density Measurement, X-Ray Diffraction, Particle Size Analysis, Compression Testing, and Pin-on-Disc Tribology Assay. The results indicated that the increase in temperature was advantageous for both compositions in terms of relative density, wear resistance, among other properties. As for the comparison at the same temperatures, diamond bodies coated with Tantalum were superior in all properties studied. Finally, the results of the microstructural, mechanical and tribological studies indicated that the HPHT route is a viable alternative for the manufacture of this type of composite, and managed to quantitatively and qualitatively compare the influence of both binders.

COMMITTEE MEMBERS:
Interno - 349801 - CARLSON PEREIRA DE SOUZA
Externo ao Programa - 2414250 - MEYSAM MASHHADIKARIMI - UFRNExterno ao Programa - 345842 - UILAME UMBELINO GOMES - UFRN