Method for aqueous processing of ALN and compositions therefrom

Patent · Tue Aug 10 04:00:00 EDT 1993

OSTI ID:6267762

Howard, K H

An aqueous composition is described containing aluminum nitride powder which exhibits a reduced tendency for hydrolysis of the aluminum nitride contained therein, comprising: (a) a liquid medium containing water, (b) aluminum nitride powder, and (c) a combination of buffering agents including a weak acid and a conjugate base of the weak acid which controls the pH of water from about 5.5 to no greater than 7.0, the combination of buffering agents being employed at a lower weight percent concentration than the of the aluminum nitride powder and the buffering agents and the liquid medium forming a solution in the aqueous composition. 11. An aqueous composition containing aluminum nitride powder which exhibits a reduced tendency for hydrolysis of the aluminum nitride contained therein, comprising: (a) water, (b) aluminum nitride powder, and (c) a combination of buffering agents including a weak acid and a conjugate base of the weak acid, the combination of buffering agents being employed at a lower weight percent concentration than that of the aluminum nitride powder, the buffering agents and the water forming a solution in the aqueous composition the combination of buffering agents including a monobasic phosphate and a dibasic phosphate, the monobasic phosphate being selected from the group consisting of monobasic potassium phosphate, monobasic sodium phosphate, and monobasic ammonium phosphate and being employed at a concentration from about 0.01 to about 2 molarity in the water, the dibasic phosphate being selected from the group consisting of dibasic potassium phosphate, dibasic sodium phosphate, a dibasic ammonium phosphate and being employed at a concentration from about 0.003 to about 0.7 molarity in the water.

• Assignee: Dow Chemical Co., Midland, MI (United States)
• Patent Number(s): A; US 5234676
• Application Number: PPN: US 7-869601
• OSTI ID: 6267762
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
ALUMINIUM COMPOUNDS
ALUMINIUM NITRIDES
AQUEOUS SOLUTIONS
BUFFERS
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
HYDROGEN COMPOUNDS
HYDROLYSIS
LYSIS
MIXTURES
NITRIDES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHOSPHATES
PHOSPHORUS COMPOUNDS
PNICTIDES
POWDERS
SOLUTIONS
SOLVOLYSIS
SYNTHESIS
WATER