Per: HELLEN CRISTINE PRATA DE OLIVEIRA (UNIVERSIDADE FEDERAL DE OURO PRETO), Adriano Corrêa Batista (UNIVERSIDADE FEDERAL DE OURO PRETO), Priscila de Souza André (UNIVERSIDADE FEDERAL DE OURO PRETO), Paulo Santos Assis (UNIVERSIDADE FEDERAL DE OURO PRETO)
Abstract:
The most important prerequisite for mass production of sintered parts successfully is the high and consistent quality of the powder used, as its characteristics determine the behavior of the stages of compacting, sintering and, consequently, the properties of the finished product. This work consists of the characterization of Fe, Cu, Nb and NbH metallic powders that will be used, later, in the production of metallic matrices. The objective is to verify if the characteristics of interest such as purity, chemical composition, particle size, morphology, crystalline structure, apparent density and behavior to thermal stimulus are satisfactory for the good performance of the particles together during the stages of the production process via Powder Metallurgy. The experimental techniques employed in this evaluation were EDX, BET, MEV, DRX and TGA / DTA. It was observed that the particles of the metallic powders have satisfactory purity combined with a good particle size distribution and morphology. The crystalline phases were identified and the thermal behavior was adequate for the usual temperature range in the sintering of these materials. With this information combined with a controlled sintering process, we have a quality final product with expected mechanical and physical properties.