Compositions: ceramic – Ceramic compositions – Refractory
Patent
1996-10-21
1997-09-16
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
342 1, C04B 3526
Patent
active
056680708
ABSTRACT:
A ceramic composition for absorbing electromagnetic waves and a method for manufacturing the same are disclosed. The composition comprises a raw powder comprising by weight between about 35% to 65% Fe.sub.2 O.sub.3, between about 1% to 5% Al.sub.2 O.sub.3, between about 0.5% to 1.5% Zn, between about 0.5% to 1.0% Cr, between about 3% to 10% Cu, between about 3% to 8% Mn, and between about 1% to 4% Co, and a mixture around the raw powder comprising by weight between 30% to 40% water, between 1.5% to 2.0% a dispersing, and between 1.5% to 2% a plasticizer. The method comprises the steps of grinding the powder, spray drying the grounded powder, forming the sprayed powder into a predetermined shape, calcinating and sintering the shape in a furnace, and cooling the sintered shape gradually. The ceramic composition absorbs the electromagnetic waves generated from electric devices such as cellular phones, beepers, computers, cordless telephones, etc. by attaching the ceramic composition at a predetermined position on the electric devices.
REFERENCES:
patent: 4960642 (1990-10-01), Kosuga et al.
patent: 5441746 (1995-08-01), Chagnon
patent: 5446459 (1995-08-01), Kim et al.
Hong Sung-Yong
Ra Chang-Ho
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