Claims
- 1. An oxygen sensor element, comprising:
- an oxygen ion conductive solid electrolyte body;
- a reference electrode and a measuring electrode disposed on said solid electrolyte body;
- a porous ceramic protective layer formed on said measuring electrode; and
- conversion means for converting active silicon to stable silica or compounds thereof, said conversion means comprising a catalytically active layer of particles consisting essentially of MgO, said catalytically active layer being adhered on the surface of the porous protective layer.
- 2. The oxygen sensor of claim 1, wherein said oxygen sensor element further comprises a heater for heating said solid electrolyte body.
- 3. An oxygen sensor comprising:
- an oxygen ion conductive solid electrolyte body;
- a reference electrode exposed to a reference gas;
- a measuring electrode arranged on the solid electrolyte body and exposed to a gas to be measured;
- a porous ceramic protective layer arranged on the measuring electrode, the measuring electrode and the porous ceramic protective layer being integrally formed by a simultaneous firing, said porous protective layer consisting of a ceramic material; and
- conversion means for converting active silicon to stable silica or compounds thereof, said conversion means comprising a catalytically layer of particles consisting essentially of MgO, said catalytically active layer being adhered on the surface of the porous protective layer.
- 4. The oxygen sensor of claim 1, further comprising alumina, silica, spinel, mullite or zirconia adhered on the surface of said protective layer.
Priority Claims (3)
Number |
Date |
Country |
Kind |
63-48537 |
Mar 1988 |
JPX |
|
63-254776 |
Oct 1988 |
JPX |
|
1-10028 |
Jan 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/737,797, filed Jul. 25, 1991, now abandoned, which in turn is a continuation of application Ser. No. 07/553,348 filed Jul. 17, 1990, now abandoned, which in turn is a continuation of application Ser. No. 07/316,939, filed Feb. 28, 1989, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (3)
Number |
Date |
Country |
57-100343 |
Jun 1982 |
JPX |
60-150450 |
Aug 1985 |
JPX |
61-79155 |
Apr 1986 |
JPX |
Continuations (3)
|
Number |
Date |
Country |
Parent |
737797 |
Jul 1991 |
|
Parent |
553348 |
Jul 1990 |
|
Parent |
316939 |
Feb 1989 |
|