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Title: Optimizing the synthesis of cobalt aluminate pigment using fractionalfactorial design.
Authors: Gomes, Y.F.
Medeiros, P.N.
Bomio, M.R.D.
Santos, I.M.G.
Paskocimas, C.A.
Nascimento, Rubens Maribondo do
Motta, F.V.
Keywords: CoAl2O4;Pigment;Optimization;Fractional factorial design;Complex Polymerization Method (CPM)
Issue Date: Jan-2015
Publisher: Elsevier
Citation: GOMES, Y.F. ; MEDEIROS, P.N. ; BOMIO, M.R.D. ; SANTOS, I.M.G. ; PASKOCIMAS, C.A. ; Nascimento, R.M. ; MOTTA, F.V. . Optimizing the synthesis of cobalt aluminate pigment using fractional factorial design. Ceramics International, v. 41, p. 699-706, 2015. Disponível em: Acesso em:
Portuguese Abstract: The increasing use of experimental design techniques comes from the growing need to optimize products and processes while minimizing costsand maximizing efficiency, productivity and quality of products. Ceramic pigments have wide application in ceramic industries in which thequality and advanced properties of materials are widely investigated. However, studies are required to improve the procedure for obtaining cobaltaluminate (CoAl2O4) using the Complex Polymerization Method (CPM). With the objective of optimizing this method, a 2(5-2)fractional factorialdesign was performed using data from UV–vis spectroscopy analysis as a response surface. To determine the best conditions for obtaining(CoAl2O4) in this study,five factors were chosen as input variables at levels determined for this study: citric acid concentration (stoichiometric),pyrolysis time (h), temperature (1C), calcination heating time and rate (1C/min). Through statistical application in the process of obtainingCoAl2O4, it was possible to study which of these factors may have greater influence in optimizing the synthesis. The precursor powders werecharacterized using TG/DSC thermogravimetric analysis, and the calcined powders were analyzed using X-ray diffraction (XRD) and energydispersive scanning electron microscopy (SEM/EDS) to confirm the structural and morphological aspects of CoAl2O4. It was found that withincreased calcination temperature 7001Co8001Co9001C, the UV–vis bands decreased with increasing absorbance intensity, and withincreasing pyrolysis time (h), there is a proportional increase in the UV–vis bands. The model was generated with the conditions proposed in thisstudy due to the determination coefficient of 99.9%, variance (R2), and satisfactory response surfaces, thus obtaining optimization of the processaccording to the needs and applicability in the ceramic industry of pigments.&2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
ISSN: 0272-8842
Appears in Collections:CT - DEMAT - Artigos publicados em periódicos

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