Title:
RADIO WAVE ABSORBER
Document Type and Number:
Japanese Patent JP3318490
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To ensure superior radio wave absorbing characteristics by imparting a compsn. consisting of a specified mol% of Na2O and the balance alumina with inevitable impurities.
SOLUTION: A mixture of alumina powder of ≥99% purity with 3-10mol% Na2O or compd. capable of forming Na2O at the time of firing is compacted in a prescribed shape by die pressing or other method. The resultant compact is fired at 1,550-1,750°C for 2-10hr in an oxidizing atmosphere to obtain the objective radio wave absorber made of an alumina sintered compact consisting of Na2O, alumina and inevitable impurities and having ≥95% relative density, a specific gravity of ≤4.0, ≥4200MPa four-point bending strength and ≥20dB attenuation constant of radio waves having 1-20GHz frequency.
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Inventors:
Shuzo Iwashita
Hiroshi Maruyama
Hiroshi Maruyama
Application Number:
JP22992196A
Publication Date:
August 26, 2002
Filing Date:
August 30, 1996
Export Citation:
Assignee:
Kyocera Corporation
International Classes:
C04B35/10; H01Q17/00; (IPC1-7): C04B35/10; H01Q17/00
Domestic Patent References:
| JP859338A | ||||
| JP1213910A | ||||
| JP5273275A |