HEAT RESISTANT CERAMIC ELECTRIC IGNITER ELEMENT

摘要

A heat-resistant ceramic electric igniter element has a plurality of compositions in a continuous unitary body structure including a central or igniting zone of a composition having a relatively high electrical resistance flanked by end zones of a composition having a lower electrical resistance to which the leads are attached. Gradual transitions from one composition to the other are provided which compensate for any differences in the coefficient of expansion between the two compositions and minimize migration between the two compositions.