Sintering study of ferrites, BaTiO3 and their ceramic composites
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
Traditional solid-state sintering studies of cobalt ferrite are extremely rare in the
literature [1]. Differences in thermal coefficients and ultimately lead to
delamination, micro-cracking or pore formation in the ceramic materials. Phase
changes as a result of sintering (e.g. tetragonal to cubic in BaTiO3) can also
contribute to sintering mismatch [2]. Cobalt ferrite and nickel cobalt ferrite
powders were prepared using solid-state ceramic processing. Calcination of the
ferrite powders was carried out with a heating rate of 5°C/min up to 1050°C
and 240 min hold at 1050°C. The calcined powders were uniaxially pressed in the
shape of Rectangular bars (20mm X 5mm X 4mm) and cold iso-statically pressed
for use as samples for dilatometric thermal analysis. The dilatometry tests of the
ferrites, the BaTiO3 (TB), and ferrtite-TB samples were carried out, some samples
with constant heating rate and some samples simulating sintering with 2h hold
time at a certain temperature. Based on the dilatometry results, sintering thermal
cycles for both ferrites and TB were proposed. The microstructure of the sintered
samples was evaluated by scanning electron microscopy and their densities were
measured by the Archimedes’ method. The results were discussed relating the
density and grain size of the samples to the sintering parameters. The same was
done with nickel cobalt ferrite and TB to obtain the composite. The sintering
study were did to devise a maximum theoretical density of >90%.
Como referenciar
AMARANTE, MAYARA dos S.; XAVIER, ROSANA S.; LENTE, MANUEL H.; GENOVA, LUIS A.; BRITO, VERA L.O. de. Sintering study of ferrites, BaTiO3 and their ceramic composites. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 732-732. Disponível em: http://repositorio.ipen.br/handle/123456789/28056. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.