Selection of size of aluminum particles prepared by solution method
US6077329A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1998 |
| Grant date | Jun 20, 2000 |
| Priority date | — |
| Expiry date | Apr 20, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2998/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Fine aluminum powders are prepared by decomposing alane-adducts in organic olvents under an inert atmosphere to provide highly uniform particles and believed particularly effective as fuels and additives, in pyrotechnics, and in energetic materials. Effective adduct species are trialkyl amines and tetramethylethylenediamine, ethers and other aromatic amines. Effective production is obtained at atmospheric pressure and at temperatures as low as 50.degree. C. with xylene solvent. Toluene, dioxane, and tetramethylethylenediamine were also effective solvents. Aliphatic solvents and other aromatic and polar solvents are believed effective. Titanium catalyst was provided as a halide, amide, and alkoxide; and it is believed that the corresponding compounds of zirconium, hafnium, vanadium, niobium, and tantalum are effective as catalysts. Particle size was controlled by varying catalyst concentration and by varying the concentration of an adducting species. It is believed that particle size is controllable by varying the catalyst, concentration of the reactants, polarity of the solvent, reaction temperature, and the stage and rate at which the solution is brought to this temperature. The p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.