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Sintering of Cermets: A Case Study of Sintering Ni–Co Ferrite with Ag-, Cu- and Ni-Dispersed Alloy Particles

1
Instituto de Estudos Avançados, São José dos Campos 12228-001, Brazil
2
Instituto Tecnológico de Aeronáutica—Programa de Pós-Graduação em Ciências e Tecnologias Espaciais, São José dos Campos 12228-900, Brazil
3
Instituto Nacional de Pesquisas Espaciais, São José dos Campos 12227-010, Brazil
*
Author to whom correspondence should be addressed.
Ceramics 2019, 2(1), 190-207; https://doi.org/10.3390/ceramics2010017
Received: 4 March 2019 / Revised: 12 March 2019 / Accepted: 15 March 2019 / Published: 20 March 2019
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Abstract

Literature has shown that the development of ferrite cermets makes possible the enhancement of the mechanical properties of these ceramics for applications in electronics, magnetomechanical sensors, and inert anodes. In this work, a Ni–Co ferrite powder was mixed with metallic powders, compacted, and sintered. The metallic powders used were Ag–Ni and Cu–Ni, prepared by mechanical alloying, and commercial Ag and Ag–Cu powders. The microstructures, crystal structures, and chemical compositions of the sintered samples were analyzed. The Cu–Ni cermet did not present traces of second phases in its XRD pattern, and the experimental results indicate a high reactivity between the ferrite and the Cu–Ni alloy. In the Ag–Cu and Ag–Ni cermets, the composition of the metallic particles was nearly 100% Ag after sintering. It was observed that, for the production of ferrite particulate cermets, the composition, particle size, and melting point of the metallic phase must be carefully adjusted in order to obtain a material with proper chemical composition and microstructure (uniform distribution of the metallic phase and no cracks in the metal–ceramic interfaces). View Full-Text
Keywords: ferrites; cermets; mechanical alloying; magnetic ceramics ferrites; cermets; mechanical alloying; magnetic ceramics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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de Brito, V.L.O.; Hieda, M.S.; Silva , E.O., Júnior; Ferreira, J.A.N.; Machado, J.P.B. Sintering of Cermets: A Case Study of Sintering Ni–Co Ferrite with Ag-, Cu- and Ni-Dispersed Alloy Particles. Ceramics 2019, 2, 190-207.

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