NOVELTY – A metal powders agglutination method involves mixing 10-30 wt.% gallium and 21.4 wt.% indium composition. The mixture is heated at ambient temperature of 20-70 degrees C, preferably 35 degrees C to obtain eutectic liquid. 10-40% eutectic liquid is mixed with 90-60% magnetic powder, in urn. The dough is placed in a desired mold, followed by compressing using a suitable mold to form the piston with pressure of 1,0.10 power 8, 5,0.10 power 8 Pa, for 2 minutes, and conducting a heat treatment on the molded piece in an inert atmosphere of 250-500 degrees C for 30 minutes to 3 hours, preferably at 300 degrees C for 1 hour. USE – Method for agglutination of metal powders that is utilized in thermomagnetic devices (claimed) and magnetic refrigerators for energy conversion. ADVANTAGE – The metal powder increases thermodynamic efficiency and the lifetime of the plates.

Main Application Field

L03 (Electro-(in)organic – chemical features of conductors, resistors, magnets, capacitors and switches, electric discharge lamps, semiconductor and other materials, batteries, accumulators and thermoelectric devices, including fuel cells, magnetic recording media, radiation emission devices, liquid crystals and basic electric elements. Growing of single crystals of semiconductors and their doping are included, but semiconductor devices, where the manufacture is not claimed are excluded. Electrography, electrophotography, magnetography, electrolysis, electrophoresis, power plant, X-ray and plasma-techniques, ion exchange resins, polyelectrolytes, electroplating, metal electrodeposition, electroforming, anodising, electrolytic cleaning, cathodic protection and electrolytic or electrothermic production or refining of metals are all covered elsewhere (Sections G, J, K and M).)

INVENTORS:

COELHO ADELINO DE AGUIAR
GAMA SERGIO
DA SILVA ISAIAS

558_MAGNETICOS

Patent number: BR102012012825-A2

PATENT STATUS:

For information contact Inova Unicamp

FOR ADDITIONAL INFORMATION:

parcerias@inova.unicamp.br

+55 (19) 3521-5207 / 2607

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