Compositions: ceramic – Ceramic compositions
Patent
1997-06-24
1998-06-23
Brunsman, David
Compositions: ceramic
Ceramic compositions
501126, 376287, 376397, 174 35MS, 264611, 264614, 264620, C04B 3526, B28B 100, H05K 900
Patent
active
057705348
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 60% and about 80% Fe.sub.2 O.sub.3, between about 3% and about 8% NiO, between about 15% and about 25% ZnO, and between about 3% and about 8% CuO, and a mixture around the raw powder comprising by weight between about 30% and about 50% water, between about 0.2% and about 0.6% a dispersing agent, between about 0.5% and about 1.0% a plasticizer, and between about 0.1% and about 0.4% a lubricant. The method comprises the steps of grinding the powder, converting the grounded powder into granulates, forming the granulates into a shaped body, sintering the shaped body in a furnace, and cooling the sintered body gradually. The ceramic composition can absorb much of the electromagnetic waves generated from electric devices such as cellular phones, beepers, computers, wireless telephones, etc. by attaching the ceramic composition at a predetermined position on the electric devices.
REFERENCES:
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patent: 4629843 (1986-12-01), Kato et al.
patent: 4960642 (1990-10-01), Kosuga et al.
patent: 5668070 (1997-09-01), Hong et al.
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