STUDY OF THE INFLUENCE OF NICKEL ADDITION IN ALUMINA BY THE ROUTE OF POWDER METALLURGY

Reference Presenter Authors
(Institution)
Abstract
12-003 Diêgo Pires Gurgel Oliveira, A.G.(Universidade federal do Rio grande do norte); Gomes, U.U.(Universidade Federal do Rio Grande do Norte); Oliveira, L.A.(Universidade Federal do Rio Grande do Norte); Gurgel, D.P.(Universidade Federal do Rio Grande do Norte); LIMA, H.D.(UFRN - UNIVERSIDADE FEDERAL DO RIO GRANDE DO NORTE); Ceramic materials based on alumina have been widely used in structural components, mainly because they have properties such as high hardness, chemical inertia and good resistance to wear. However, its low toughness is a factor that compromises its use in several other applications, with the addition of nickel as a possible solution to this problem. In this context, this work aims to study the addition of nickel to alumina, using the route of powder metallurgy in the processing of the material. The percentages of nickel added were 2, 4 and 6% w; and for each composition, high-energy grinding in a planetary mill was carried out for 2, 4, 9 and 16h. Subsequently, the samples were compacted at 300 MPa and sintered in a vacuum oven at 1400 ° C for 2 hours. The samples were characterized in terms of their physical and mechanical properties, with an improvement in the sinterability of the material with increasing grinding time and nickel content, with decrease and homogenization of porosity and increase in hardness. Values ??of densities above 80% of theoretical were obtained. In the 4 hour grinding time and the addition of 2% nickel, in particular, the highest hardness values ??(1068.7 +/- 32.6 HV) and density of approximately 99% of the theoretical density were achieved.
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