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Abstract

A method for producing a platinum-containing resistor, configured as a temperature sensor, includes applying a resistive coat to a ceramic support having a surface of electrically insulating material, covering an outer surface of the resistive coat with at least one layer of an electrically insulating material, which is preferably applied as a diffusion barrier in the form of an intermediate layer, and forming an electrode on the side of the resistive coat facing away from the substrate surface and spaced therefrom, using a thick-film technique. This electrode, comprising a layer of platinum, is covered by a glass passivation layer and is therefore surrounded by the electrically insulating material of the diffusion barrier and the glass passivation layer. The electrode is negatively electrically biased in relation to at least one connection of the resistive layer or the measuring resistor. An advantage is that platinum toxicants (Si- and metal ions), which are present in the form of positive ions in extreme ambient conditions, are attracted to the negative platinum layer.

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First Claim