METHOD FOR PRODUCING ANODIC ALUMINIUM OXIDE BASE ELECTRETS Russian patent published in 1998 - IPC

Abstract RU 2110863 C1

FIELD: miscellaneous electrophysical devices, such as microphones, sensors, air cleaners. SUBSTANCE: method is characterized in that Al-AJ-Al systems obtained by oxidizing aluminium in aqueous solution of boric acid preceded by aluminium oxidation in aqueous solution of oxalic acid were subjected to three alternate baking procedures at 330 C for two minutes and held in boric acid electrolyte at 330 V for three minutes, and at 600 V for seven minutes followed by electreting in corona discharge in the open under room conditions at 3-5 kV for 30-90 s with air gap length of 3-25 mm. EFFECT: improved stability of electret characteristics. 1 dwg

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RU 2 110 863 C1

Authors

Zudov A.I.

Zudova L.A.

Najmushina S.I.

Shestakova N.V.

Dates

1998-05-10—Published

1996-07-22—Filed