Abstract: A planar temperature sensing element is provided with first and second layers disposed over the temperature-sensing device. The second layer comprises an inorganic binder, a first ceramic material, and a second ceramic material. The inorganic binder is selected from the group consisting of M3+ phosphates, M4+ phosphates, M3+ nitrates, M4+ nitrates, and combinations comprising at least one of the foregoing. The first ceramic material is selected from the group consisting of aluminosilicate, M3+ aluminates, M4+ aluminates, M3+ hexaluminates, M4+ hexaluminates, and combinations comprising at least one of the foregoing. The second ceramic material comprises a phosphate-containing material.

Abstract: A packaged sensor can comprise: a housing, a retaining device disposed in the housing, a sensing element, a sealing member disposed in between the retaining device and the housing terminal end, a first electrical lead, a second electrical lead, and a first support member. The first support member can be disposed between the sealing member and the housing terminal end. The retaining device can be disposed in a chamber in the housing, and can comprise retaining device comprising a first end and a second end, channels extending between the first end and the second end, and can have a sealant material disposed at the first end of the retaining device. The sensing element can have an element terminal end disposed in physical contact with the retaining device.

Abstract: In one embodiment, a method of making a sensor comprises: forming a slurry comprising a metal oxide, a binder, an acetate, and a reducing material, applying the slurry to at least a portion of a sensing element comprising two electrodes with an electrolyte disposed therebetween, and calcining the slurry to form a protective coating. In one embodiment, a gas sensor, comprises: a sensing element comprising a sensing electrode and a reference electrode having an electrolyte disposed therebetween, and a protective coating disposed over the sensing electrode, wherein the protective coating comprises aluminum oxide, an alpha alumina and about 2 wt % to about 15 wt % solid solution, based upon the total weight of the protective coating.

Abstract: A ceramic device comprises a substrate; a resistive element disposed on the substrate; and a protective coating disposed on the resistive element, wherein the protective coating comprises a M+3 metal oxide, a M+4 metal oxide, or a combination comprising at least one of the foregoing, and a phosphate.