Transparent alumina microspheres

Details Transparent alumina microspheres Transparent alumina microspheres

C - Chemistry, Metallurgy

01

F

23/241, 18/503,

C01F 7/02 (2006.01) C01F 7/36 (2006.01) C04B 35/00 (2006.01) E01F 9/04 (2006.01) G02B 5/128 (2006.01)

Patent

CA 1286479

ABSTRACT OF THE DISCLOSURE Procedure for making Al2O3 spheroids, 600 micrometers in diameter or less, utilizes an AlOOH sol containing 0.25% weight percent MgO (in the form of Mg(NO3)2.6H2O) and HNO3. The sol is dispersed into droplets in a particle forming fluid (e.g., 2-ethylhexanol) where gelling occurs. The gelled spheroids are collected, dried and pre-fired in air at temperatures less than 1,200°C for up to about 12 hours. The dried and prefired beads are fired in a 2-step process at temperatures of about 1,850-1,950°C in the following sequence: a first dry oxygen firing for about ten minutes, followed by a wet hydrogen firing for up to 350 minutes. Reasonably transparent microspheres having crystallites in the range of 5-100 micrometers are obtained with little intergranular porosity, and their density is estimated to be near theoretical.

553078

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