Extruded insulator for spark plug and method of making the same
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United States of America Patent
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Jul 4, 2017
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N/A
app pub date -
Nov 11, 2013
filing date -
Nov 21, 2012
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Abstract
A method for making an extruded insulator for a spark plug in a manner that minimizes pores, relics and/or other defects in the insulator microstructure so that the overall dielectric strength or performance of the insulator is improved. The method may be used to manufacture an extruded insulator that avoids many of the drawbacks associated with such defects, but also has a stepped internal bore for receiving a center electrode. In one embodiment, the method uses a multi-phase extrusion process to extrude a ceramic paste around an elongated arbor and form an extruded section, and then removes the arbor from the extruded section to reveal a stepped internal bore.
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