| 摘要 |
Al foil for electrolytic capacitors has an increased surface capacitance. Pore-free layers contg. Al and Al oxide are deposited on both sides of a flat Al foil. The Al is present as columnar crystals, which are surrounded by the Al2O3 and electrically insulated from each other. Mfg. the capacitors comprises vacuum-coating on both sides with an Al film at an oxygen partial pressure of 0.0001 - 0.002 mbar and a coating rate of 200-5000 nm/sec. Angle of impact of the Al particles at the start of the coating process is greater than 30 deg. The Al/alumina film contains valve metals e.g. Ti, Ta, or Zr or their cpds. and/or stabilising elements such as P, Cr or their cpds. These components are added to the Al to be evaporated, co-evaporated from independent sources, or incorporated after vacuum-coating by treatment with an aq. stabilising soln. USE/ADVANTAGE - Al foil obtd. is for electrolytic capacitors, has increased surface capacitance and stability. No need to use corrosive or toxic etch solns. or electrolysis baths. Conventional Al vacuum-coating equipment is used
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| 申请人 |
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV, 8000 MUENCHEN, DE |
发明人 |
NEUMANN, MANFRED, DR., O-8021 DRESDEN, DE;HOETZSCH, GUENTER, DR., O-8046 DRESDEN, DE;MORGNER, HENRY, O-8017 DRESDEN, DE;PAUL, MANFRED, DR., O-8019 DRESDEN, DE;WEILAND, HEINRICH, O-9200 FREIBERG, DE |
