Patent ID: 7607206
Filing Date: 2009-10-27
Classification: F23Q,H01C,Y10T

Abstract:
1. A method for forming a layered heating element for a glow plug, said method comprising the steps of: pre-forming an electrically conductive core as a self-supporting body; pre-forming an electrically non-conducting insulator layer having an exterior as another self-supporting body distinct from the pre-formed core; pre-forming an electrically resistive layer as a further self-supporting body distinct from the pre-formed core and the pre-formed insulator layer; assembling a precursor structure by substantially enveloping the pre-formed core within the pre-formed insulator layer and applying the pre-formed resistive layer to the exterior of the insulator layer; compressing the precursor structure; and sintering the compressed precursor structure to form a monolithic heating element with the core bonded to the insulator layer and the insulator layer bonded to the resistive layer.