Electrodes for ceramic bodies

Claim 2

A process as set forth in claim 1 in which said body is refired after application of the silver electroding paste at a temperature less than the temperature at which said coating of said liquid composition is matured.

Claim 3

A process as set forth in claim 3 in which said coating of said liquid composition is matured by heating to a temperature in the range from about 675* C to about 820* C.

Claim 4

A process as set forth in claim 2 in which said body is refired after application of the silver electroding paste at a temperature less than the temperature at which said coating of said liquid composition is matured.

Claim 5

A process as set forth in claim 5 in which said coating of said liquid composition is matured by heating to a temperature in the range from about 675* C to about 820* C.

Claim 6

A semiconductive ceramic body having solderable, ohmic electrodes on opposite faces thereof characterized in that said electrodes are produced by applying to said faces coatings of a liquid composition consisting essentially of the reaction product of aluminum powder with an aqueous vehicle which contains a phosphate-chromate-(Mg) reaction product, said last-mentioned reaction product having an atomic ratio of Cr to P between about 0.31:1 and about 0.75:1, an atomic ratio of (Mg) to P between about 0.5:1 and about 1.1:1, and an atomic ratio of (Mg) to Cr between about 1. 0:1 and about 2. 5:1, (Mg) being the total of magnesium and any substituent therefor, drying said coatings, then firing said coated body, to mature said coatings, in an oxidizing atmosphere to a temperature in the range from about 590* C to about 950* C, and subsequently providing a silver coating over a portion of each of the electrode-coated surfaces.