Näherungsschalter mit keramischer Stirnfläche und Verfahren zu dessen Herstellung

摘要

Proximity switch having a metal housing casing (1), into which a ceramic part (2) acting as a seal is inserted on the active front side, is novel in that the ceramic part (2) is shrunk into the housing casing (1), and that a sealing material (7) between the housing casing (1) and the ceramic part (2) acts as a gas and liq. impermeable seal. Also claimed is a process for producing the above proximity switch, novel in that the tight connection between the ceramic part (2) and the housing casing (1) is produced by inserting the ceramic part, which has a larger dia. than the corresponding receiving section in the housing casing (1) at room temp., into a heated housing casing, and after cooling resulting in shrinkage, the ceramic part (2) is held by frictional connection such that, thanks to a surface coating of the housing casing in the joining region (4), a gas and liq. impermeable seal is produced between this and the ceramic part (2).