EFFECT OF SINTERING PARAMETERS AND ANODIC OXIDATION ON ELECTRICAL PROPERTIES OF NIOBIUM ELECTROLYTIC CAPACITORS

Reference	Presenter	Authors (Institution)	Abstract
12-001	Edson Silva do Nascimento	Nascimento, E.S.(Universidade Federal do Rio Grande do Norte); Mello Jr, M.M.(UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE); Karimi, M.M.(Federal University of Rio Grande do Norte); Gomes, U.U.(Universidade Federal do Rio Grande do Norte);	The electrolytic capacitors have high specific capacitance, so they can store high energy in small volumes compared to other types of capacitors. This work aims to find an alternative material for tantalum capacitors already used in industries. Niobium is lighter and cheaper metal than tantalum and can be a potential alternative metal for producing capacitors. They belong to the same group in periodic element table, thus exhibit some similar physical and chemical properties. Niobium is used in many technologically important applications, and Brazil has the largest reserves, around 98%, of this metal. The production route of the niobium capacitor is being performed by powder metallurgy process. Initially, the niobium powder was characterized by XRD, SEM and laser particle size; and then sieved to achieve a particle size of 400 mesh. Subsequently, the powder was compacted in a special matrix and then sintered at different temperatures and isothermal holding times. After sintering, an anodic oxidation process at different voltages was performed to obtain oxide layer on the sintered samples, which plays the role in electrical properties of the capacitor. The results obtained via a capacitance bridge, showed a strong effect of sintering and anodic oxidation process on the capacitors properties. The best results were obtained for the sample sintered at 1400 ° C for 60 minutes and anodized with 10V.
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