Uniform and homogeneous permanent magnet powders and permanent m

Details Uniform and homogeneous permanent magnet powders and permanent m Uniform and homogeneous permanent magnet powders and permanent m

1990-02-12

1991-09-03

Dean, R.

Metallurgical apparatus

Means for treating ores or for extracting metals

By means precipitating metal from solution

266171, 266202, 425 6, B22F 924

Patent

active

050446134

ABSTRACT:
Method and apparatus for forming rare-earth magnets and magnet precursors of fine particle sized metal alloy powders with a high degree of metal to metal intimacy and homogeneity in the particle to particle metal composition. Salts of the desired metals which may include or be selected from zirconium, samarium, iron, cobalt, copper, neodymium and boron with nitric acid in a water based solution are atomized through a nozzle, which may be ultrasonic, into fine mist droplets form metal oxide particles which condense through a heated, atmospheric environment furnace. The furnace temperature is in a range of 600.degree. to 1150.degree. C. and causes decompositon of the metal salts along with their oxidation, driving off the liquid and nitrogen components along with other carrier materials. A very fine sized powder, typically micron dimension size powder of metal oxides, in which each particle represents a homogeneous proportion of the desired metal components, is collected in the bottom of the furnace. These fine particle metal oxide powders are subsequently reduced to metal alloy powder particles of similar homogeneity in the metal proportions. The reduction reaction typically utilizes calcium hydride in a hydrogen atmosphere to convert the metal oxides to metal alloy particles. The metal alloy powder is then aligned, compacted, densified and magnetized to produce magnets of high magnetic performance.

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