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US 9,178,336 B2Granted
Spark plug
AssigneeFram Group IP LLC
InventorsJing Zheng, Jeffrey T. Boehler
Life of this patent
Estimating the term…
Abstract
A spark plug is provided having a resistor. The resistor is made from resistor glass material containing an alkali free barium alumino-silicate glass mixed with mullite. In one embodiment, the resistor is a 15 to 30 wt % alkali free barium alumino-silicate glass and 10 to 25 wt % mullite. The resistor material provides for a greater processing kiln temperature range with reduced resistor variability and improved durability performance.
Claims19
A method of fabricating a sparkplug comprising:
- mixing carbon and ceramic powder to make a carbon slurry;
- adding the carbon slurry to a glass mixture, wherein the carbon slurry-glass mixture comprises from 15 to 30% by weight of an alkali free barium alumino-silicate glass, from 10 to 25% by weight Mullite, and the balance being comprised of the ceramic powder, carbon, borate glass, and organic binders;
- drying the carbon slurry-glass mixture;
- forming a carbon resistor glass;
- loading the carbon resistor glass into a sparkplug insulator to form an insulator-carbon resistor glass assembly;
- and
- heating the insulator-carbon resistor glass assembly to transform the carbon resistor glass into a semi-melt condition.
4 more elements
A method of fabricating a sparkplug comprising:
- mixing carbon and ceramic powder to make carbon slurry;
- adding the carbon slurry to a glass mixture,
- wherein the carbon slurry-glass mixture comprises from 15 to 30% by weight of an alkali free barium alumino-silicate glass and from 10 to 25% by weight Mullite;
- drying the carbon slurry-glass mixture;
- screening the carbon slurry-glass mixture after drying with a #20 mesh;
- forming a carbon resistor glass;
- loading the carbon resistor glass into a sparkplug insulator to form an insulator-carbon resistor glass assembly;
- and
- heating the insulator-carbon resistor glass assembly to transform the carbon resistor glass into a semi-melt condition.
6 more elements
A method of fabricating a sparkplug comprising:
- mixing carbon and ceramic powder to make a carbon slurry;
- adding the carbon slurry to a glass mixture, wherein the carbon slurry-glass mixture comprises an alkali free barium alumino-silicate glass;
- drying the carbon slurry-glass mixture;
- forming a carbon resistor glass;
- loading the carbon resistor glass into a sparkplug insulator to form an insulator-carbon resistor glass assembly;
- and
- heating the insulator-carbon resistor glass assembly to transform the carbon resistor glass into a semi-melt condition;
- wherein the alkali free barium alumino-silicate glass is comprised of MgO 2.0 wt %-Al2O3 11.3 wt %-SiO2 53.5 wt %-CaO-12.0 wt %-BaO-20.5 wt % in composition.
5 more elements
Dependencies are inferred from the claim text.