Aqueous colloidal dispersions of sub-micrometer alumina particles
AssigneeNational Science Council
InventorsWen-Cheng Wei, Su-Jen Lu
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Abstract
An aqueous alumina dispersion prepared from high quality, submicrometer alumina powder, suitable for manufacturing fine ceramic products, is disclosed. The sub-micrometer alumina particles have a surface area of 2.5 to 50 m.sup.2 per gram of the alumina particles. There are three components in the dispersion: sub-micrometer alumina particles (10 to 68 percent based on weight of the colloidal dispersion), semicarbazide hydrochloride derivative (0.1 to 5 percent based on the weight of the alumina particles), and water (the balance).
Claims7
An aqueous colloidal dispersion of sub-micrometer alumina particles comprising 10 to 68% of sub-micrometer alumina particles having a surface area of 2.5 to 50 m.sup.2 per gram of the alumina particles, based on the weight of said colloidal dispersion;
- 0.1 to 5% of a semicarbazide hydrochloride derivative, based on the weight of said alumina particles;
- and water as the balance, in which said semicarbazide hydrochloride derivative which functions as a dispersing agent has a chemical formula as follows:
- ##STR3## wherein R.sub.1 and R.sub.2 are hydrogen, C.sub.1 -C.sub.4 alkyl group, or amino group independently.
Dependencies are inferred from the claim text.