Method of making a titanium dioxide oxygen sensor element with f

Details Method of making a titanium dioxide oxygen sensor element with f Method of making a titanium dioxide oxygen sensor element with f

1984-04-27

1985-08-20

Weston, Caleb

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

204424, 338 34, 4271262, 4271263, B05D 512, G01N 2712

Patent

active

045362416

ABSTRACT:
This specification discloses a method of making a titanium dioxide element (20) which can be used as an oxygen sensing element. The method involves the selection of at least a pair of electrically conductive leads (12--12) which resist oxidation at high temperatures. The leads are placed in a position generally close to one another with a slurry bridgeable space therebetween. Slurry (14) is applied to the pair of spaced leads. The slurry contains titanium dioxide, an organic heat decomposable binder, and an organic solvent. The slurry is one that when applied to the pair of spaced leads the surface tension of the slurry draws it into a compact generally spherical shape about the pair of spaced leads. The slurry is dried, heated and sintered so that the titanium dioxide particles contained in the slurry are sintering together to form a titanium dioxide oxygen sensing element bridging the bridgeable space between the pair of spaced leads. The titanium dioxide sensing element has a thickness in a range of 20-200 micrometers and a density in a range of 60-80% of the theoretical value of density of titanium dioxide which is 4.26 grams per cubic centimeter. The titanium dioxide oxygen sensing element so formed is characterized as a fast responding element in sensing ambient changes from oxygen-rich to oxygen-lean conditions and vice-versa.

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