Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1985-09-13
1986-06-17
Kaplan, G. L.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204192C, 204192SP, 204408, 204425, G01N 2756
Patent
active
045954852
ABSTRACT:
A limiting electric current type oxygen sensor comprising a first electrode of a gas-permeable film, a thin solid electrolyte film which is crystallized along one direction to decrease resistance and which has a thickness falling in the range between 0.1 .mu.m and 30 .mu.m, and a second electrode of a gas-permeable film sequentially formed on an electrically insulating substrate. This limiting electric current type oxygen sensor is also provided with a porous coating layer or a dense coating layer. The porous coating layer made of Al.sub.2 O.sub.3, SiO.sub.2, spinnel, SiC, Si.sub.3 N.sub.4 and etc., has a porosity of not more than 30% and a thickness of not less than 1 .mu.m, and serves as a gas diffusion flow rate-determining portion. The dense coating layer serves to control a gas permeation path such that either the first electrode or the substrate is used as the gas diffusion flow rate-determining portion.
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Hayakawa Kiyoharu
Kondo Haruyoshi
Saji Keiichi
Takahashi Hideaki
Takeuchi Takashi
Kabushiki Kaisha Toyota Chuo Kenkyusho
Kaplan G. L.
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