Banca de QUALIFICAÇÃO: MIKHAEL BRENER SOUSA RODARTE

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MIKHAEL BRENER SOUSA RODARTE
DATE: 31/01/2023
TIME: 13:30
LOCAL: https://meet.google.com/kkd-cepn-fza
TITLE:

STUDY OF CALCIUM PHOSPHATE COATING WITH SILVER NANOPARTICLE DEPOSITION ON ALUMIN SCAFFOLD.

KEY WORDS:

Alumina; scaffolds; pores; bioceramics; biomaterials.

PAGES: 14
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUMMARY:

In this work, porous alumina ceramics were produced by powder metallurgy process, using alumina as base material and ammonium bicarbonate (BA) as pore former. The CT 3000 SG alumina used has an average grain size of 0.8 µm. The BA powder has granulometry between 325 to 425 µm. The granulometric distribution of alumina was obtained by laser diffraction particle analyzer using suspension in isopropyl alcohol and compared with that obtained by analysis of micrographs by SEM (scanning electron microscopy). On the other hand, that of BA was obtained only through the analysis of micrographs in SEM. The concentration of BA used was 40% by mass. The alumina and BA powders were mixed in a planetary mill. The sample were compacted uniaxially with a pressure of 200 MPA. To remove the BA, a heat treatment was performed at 270°C for 120 minutes, with a heating rate of 0.5°C/min. Sintering was at 1500°C for 120 minutes. Porosity measurements were obtained using the Archimedes method. Consecutively, analyzes of distribution, interconnectivity and pore size were performed by analysis of micrographs performed by SEM. The sintering time and temperature were convenient for the consolidation of the ceramic. The 40% concentration of BA showed good results, with a porosity of 55% and macro and micropores well distributed, interconnected and with varied sizes. The BA was eliminated, as in the EDS results only alumina was identified in the material composition. The biomimetic coating process was carried out in order to promote a uniform layer of calcium phosphate across the surface of the samples, with the aim of making the samples bioactive, and consecutively promoting biological activity in them.

BANKING MEMBERS:
Externo à Instituição - João Paulo Barros Machado
Interno - 1049564 - ARTUR MARIANO DE SOUSA MALAFAIA
Presidente - 2029927 - ROSELI MARINS BALESTRA
Externo à Instituição - Sandra Maria Fernandes Carvalho