Preparation of Uniform α-Alumina Microspheres by Catalytic Precipitation and Calcination Process

Zhou Wang; Xiang Qian Shen; Mao Xiang Jing; Liang Yan; Zhou Luo

doi:10.4028/www.scientific.net/AMR.936.145

Paper Titles

Preparation and Optoelectronic Properties of In₂O₃ Microtubes
p.123

The Anti-Plane Shear Problem of Two Symmetric Cracks Originating from an Elliptical Hole in 1D Hexagonal Piezoelectric QCs
p.127

CdS-Bentonite Sulfide Ion Sensor: pH Effect and Selectivity
p.136

Relationship between Annealing and Shape Memory Effect of Shape Memory Polyurethane
p.140

Preparation of Uniform α-Alumina Microspheres by Catalytic Precipitation and Calcination Process
p.145

Phase Structure and Piezoelectric Properties of (K_0.5Nb_0.5)NbO₃- CaZrO₃ Ceramics
p.149

A Novel Model for Predicting the Thermal Conductivity of Fiber Reinforced Ceramic Materials
p.154

Nucleation, Crystallization and Characterization of Mica-Based Glass-Ceramics with Fluorapatite
p.164

Preparation of C@ZrSiO₄ Inclusion Pigment Using Compound Colorants via Non-Hydrolytic Sol-Gel Method
p.170

HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 936Preparation of Uniform α-Alumina Microspheres by...

Preparation of Uniform α-Alumina Microspheres by Catalytic Precipitation and Calcination Process

Abstract:

Uniform α-alumina microspheres with mean partice size about 5-6 μm were prepared by the catalytic precipitation and calcination process. The spherical hydrated alumina precursor was first synthesized by the precipitation using ammonium aluminum sulfate and urea. During the reaction process, the urea can be decomposed to the mediator urease, which acts as the catalyst to influence the precipitate formation. The as-prepared α-alumina microspheres exhibit a very good shaping ability and the green body shaped by the dry-press process has a low linear shrinkage rate 5.8% at the sintering process.

You might also be interested in these eBooks

Materials Science and Engineering Technology

View Preview

Info:

Periodical:

Advanced Materials Research (Volume 936)

Pages:

145-148

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.936.145

Citation:

Cite this paper

Online since:

June 2014

Authors:

Zhou Wang, Xiang Qian Shen*, Mao Xiang Jing, Liang Yan, Zhou Luo

Keywords:

Catalyst, Microsphere, Precipitation, Urea, α-Alumina

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] A. Krell, P. Blank, H.W. Ma, T. Hutzler and M. Nebelung, Processing of high-density submicrometer Al2O3 for new applications, J. Am. Ceram. Soc. 86 (2003) 122-124.

DOI: 10.1111/j.1151-2916.2003.tb03339.x

Google Scholar

[2] D.H. Li, X.Q. Shen, Z. Wang, Preparation of High Purity Spherical Alumina. Rare Metal Mat. Eng. 37 (2008) 252-255.

Google Scholar

[3] T. Hirayama, High-temperature characteristics of transition powder with ultrafine spherical particles, J. Am. Ceram. Soc. 70 (1987) 122-124.

DOI: 10.1111/j.1151-2916.1987.tb05666.x

Google Scholar

[4] T. I. Barry, P. K. Bayliss, L. A. Lay, Mixed oxides prepared with an induction plasma Torch, J. Mater. Sci. 3 (1968) 229-238.

DOI: 10.1007/bf00741955

Google Scholar

[5] S.G. Deng, Y.S. Lin, Granulation of sol-gel derived nanostructured alumina, AIChE J. 43 (1997) 505-514.

DOI: 10.1002/aic.690430223

Google Scholar

[6] Y. Aman, C. Rossignol, V. Garnier, E. Djurado, Low temperature synthesis of ultrafine non vermicular α–alumina from aerosol decomposition of aluminum nitrates salts, J. Eur. Ceram. Soc. 33 (2013) 1917-(1928).

DOI: 10.1016/j.jeurceramsoc.2013.01.035

Google Scholar

[7] A. Islam, Y.H. Taufiq-Yap, C.M. Chu, E.S. Chan, P. Ravindra, Synthesis and characterization of millimetric gamma alumina spherical particles by oil drop granulation method, J. Pour. Mater. 19 (2012) 807-817.

DOI: 10.1007/s10934-011-9535-0

Google Scholar

[8] Z.R. Ismagilov, R.A. Shkrabina, N.A. Koryaba, New techology for production of spherical alumina supports for fluidized bed combustion, Catal. Today 47 (1999) 51-57.

DOI: 10.1016/s0920-5861(98)00283-1

Google Scholar

[9] F. Kara, G. Sahin, Hydrated aluminum sulfate precipitation by enzyme-catalysed urea decomposition, J. Eur. Ceram. Soc. 20 (2000) 689-695.

DOI: 10.1016/s0955-2219(99)00202-2

Google Scholar

[10] M. Nguefack, A.F. Popa, S. Rossignol, C. Kappenstein, Preparation of alumina through a sol-gel process. Synthesis, characterization, thermal evolution and model of intermediate bohmite, Phys. Chem. Chem. Phys. 5 (2003) 4279-4289.

DOI: 10.1039/b306170a

Google Scholar

[11] K. Morinaga, T. Torikai, K. Nakagawa, S. Fujino, Fabrication of fine α-Al2O3 powders by thermal decomposition of ammonium aluminum carbonate hydroxide (AACH), Acta Mater. 48 (2000) 4735-4741.

DOI: 10.1016/s1359-6454(00)00265-2

Google Scholar