期刊
LANGMUIR
卷 24, 期 17, 页码 9525-9530出版社
AMER CHEMICAL SOC
DOI: 10.1021/la801300m
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资金
- Foundation for Science and Technology (FCT) of Portugal [SFRH/BPD/27013/2006]
- SERC-DST (Government of India) [SR/BY/E-04/06]
- CICECO
A stoichiometric MgAl2O4 spinel (MAS) powder was synthesized by heat treating at 1400 degrees C for 2 h a compacted mixture of alpha-Al2O3 and calcined caustic MgO, followed by crushing and milling. The surface of this powder was then passivated against hydrolysis with H3PO4 and Al(H2PO4)(3) in an ethanol solution. The as-passivated powder could then be dispersed in water using tetramethylammonium hydroxide (TMAH) and an ammonium salt of poly(acrylic acid) (Duramax D-3005) as dispersing agents and gelcast to form green consolidates with relatively high strength (> 15 MPa). The good dispersing behavior of the passivated powder in water was confirmed by the low viscosity of its suspension containing 41-45 vol % solids, demonstrating the viability of replacing organic solvents by water in colloidal processing of MAS-based ceramics. The Fourier transform infrared (FT-IR), X-ray diffraction (XRD), and energy dispersive X-ray (EDAX) studies revealed that only negligible amounts of phosphate ions at the Surface are required to effectively protect the powder from reacting with water.
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