David Z Dent

US Patent:

62219219, Apr 24, 2001

Filed:

Oct 14, 1999

Appl. No.:

9/417396

Inventors:

John Lang Lombardi - Tucson AZ
Kevin Haines Johnston - Beverly Hills CA
David Zackery Dent - Tucson AZ

Assignee:

Advanced Ceramics Research, Inc. - Tucson AZ

International Classification:

B01F 312
B01F 1714
B01F 1746
C04B 35565

US Classification:

516 33

Abstract:

A dispersant system for formulating stable non-aqueous siliceous particulate slurries, comprising a vehicle comprising a liquid ester, and a dispersant comprising an alkoxylated aminoalcohol and organophosphate ester. Siliceous particulate slurries in accordance with the present invention can include slurries containing siliceous ceramic particulate (i. e. , silicon nitride, silicon carbide, silica, and silicon metal powders partially oxidized by air exposure). A wide variety of linear and cyclic organic esters can be used as a vehicle component, including lactones. The alkoxylated aininoalcohol is typically an ethoxylated aminoethanol oligomer. A wide variety of aromatic and nonaromatic organophosphate ester compounds can be used for the second dispersant component.