ELEKTRO-BAUELEMENT.

摘要

The substrate consists of a carrier (12) of mainly Fe containing material, an electrically insulating layer (15) and on top of this at least one conductor layer or -track (16). The insulating layer, pref. glass with no alkaline content, is fired onto the carrier-material with the help of an intermediate Al-layer (14). The carrier may be unalloyed steel or contain small quantities of other metals, e.g. normal sheet-iron, on which the surface is a plated Al-layer or heat-aluminised layer, pref. 5-80, specifically 15-40 microns thick. The glass layer is pref. thicker than the Al-layer, e.g. more than 20, pref. more than 50 micron thick. It may be present over the entire surface or localised, e.g. under meandering conductor tracks, depending on the heat distribution requirements. A heating element is pref. constructed using a thick film track containing Ni to give a strong PTC effect. This can be built into a space heating apparatus. The conductor layers can also include a resistive layer, or form capacitors or inductors. Conductive layers can be made to allow solder connections to be made or electrical power connections by studs or screws. A process is also claimed.