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.com
Volume 6
Research & Reviews: Journal of Material Sciences
ISSN: 2321-6212
Ceramics 2018
May 14-15, 2018
May 14-15, 2018 | Rome, Italy
4
th
International Conference and Expo on
Ceramics and Composite Materials
Homogeneous precipitation of ceramic powders preparation from sulfate-sulfite-ammonia system
Satoshi Sugita
University of Guanajuato, Mexico
H
ighquality ceramic powders canbe producedbyhomogeneous precipitation.Thismethodpermits to control purity, particle
size, shape, distribution and homogeneity, as known these factors play a very important role in the properties of finished
ceramic materials. Alumina nano-sized particles could be obtained starting from the admixture of solutions of aluminum
sulfate and ammonium bisulfite. The homogeneous precipitation carried out at pH 4.2, when the mixture of solutions was
heated to the decomposition and boiling temperature. Nano-, spherical with narrow size distribution, and soft agglomerated,
the basic aluminum sulfate (BAS) was easily produced. The powder was heated at 950
o
C to decompose sulfate and then was
calcined a 1250
o
C to transform to α-alumina. Otherwise, treating BAS with aqueous ammonium solution, the precipitate
could be transformed to nano-sized fibrillar pseudoboehmite, which could be transformed to α-alumina by calcining. On the
other hand, to prepare mullite precursor, initially the silica nano powder (Aerosil 200, Degussa) was dispersed in water and
mixed with the solutions of aluminum sulfate and ammonium bisulfite. The admixture was heated to the decomposition and
boiling temperature, in which a precipitate of silica covered with BAS was produced. This precursor was transformed to mullite
heating at 1250°C. The other application example of this homogeneous precipitation is used to prepare in the fabrication of
basic chromium sulfate. Starting from the admixture of solutions of chromium sulfate and ammonium bisulfite, the basic
chromium sulfate can be precipitated. But in the last case it is not easy for all chromium precipitate since chromium forms a
water soluble complex with ammonia. Even though, almost every chromium can be precipitated. In this presentation, a simple
useful technique of homogeneous precipitation for preparing the basic sulfate salts of metals starting from the admixture of
metal ion-sulfate-sulfite-ammonia aqueous system is discussed.
Recent Publications:
1. Rocha J, Guo Y, Martinez JM, Sugita S, Redington W, Pomeroy M, Hampshire M (2016) Liquid/glass Immiscibility in
yttria doped mullite ceramics. J. Eur. Ceram. Soc. 36:3523-3530
2. López FJ, Sugita S, Kobayashi T (2014) Cesium-adsorbent geopolymer foams based on silica from rice husk and
metakaolin. Chem. Lett. 43:128–30.
3. Reyes SY, Serrato J, Sugita S (2013) Microstructural characterization of sanitaryware, the relationship spinel and
mullite, Journal of Ceramic Processing Research 14, 4:492-497.
4. Zamorategui A, Alatorre A, Ibanez J, Garcia MG, Nosaka Y, Kobayashi T, Sugita S (2013) Thermodynamic and
electrochemical study on the mechanism of formation of Ag(OH)4− in alkaline media, Electrochimica Acta 111:268–74.
5. Zamorategui A, Sugita S (2013) Effect of sulfate Ion on the
γ
-Al
2
O
3
surface area synthesized by homogeneous
precipitation, ARPN Journal of Science and Technology, 3, 5:485-91.
6. Zamorategui A, Martinez JM, Soto JA, Sugita S (2013) Ammonium bisulfite as a precipitant agent to synthesize
pseudoboehmite (
γ
-AlOOH), International Journal of Engineering and Innovative Technology 3, 5:401-6.
7. Tovar-Carrillo KL, Sugita S, Tagaya M, Kobayashi T (2013) Fibroblast compatibility on scaffold hydrogels prepared
from Agave Tequilana Weber bagasse for Tissue Regeneration, Ind. Eng. Chem. Res. 52, 33:11607–11613.
Satoshi Sugita, Res. Rev. J Mat. Sci. 2018, Volume 6
DOI: 10.4172/2321-6212-C1-014