Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1998-04-20
2000-06-20
Willis, Prince
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75362, 75371, C22B 2102, B22F 924
Patent
active
060773294
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 product powder is passivated in the reaction vessel by exposing the solution to air before product separation or by controlling the admission of air to the separated, dried powder.
REFERENCES:
patent: 3578436 (1971-05-01), Becker et al.
Higa Kelvin T.
Hollins Richard A.
Johnson Curtis E.
Kalmbaugh David S.
McGuthry-Banks Tima
The United States of America as represented by the Secretary of
Willis Prince
LandOfFree
Selection of size of aluminum particles prepared by solution met does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Selection of size of aluminum particles prepared by solution met, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Selection of size of aluminum particles prepared by solution met will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1848599