Electrode material for a spark plug

A spark plug, comprising:

• a shell;
• an insulator disposed at least partially within the shell;
• a center electrode disposed at least partially within the insulator;
• and
• a ground electrode configured to form a spark gap (G) that is located between the ground electrode and the center electrode, wherein an electrode material for the center electrode, for the ground electrode, or for both the center electrode and the ground electrode includes greater than or equal to 22 wt % iron (Fe), greater than or equal to 20 wt % nickel (Ni), and greater than or equal to 22 wt % cobalt (Co), wherein the electrode material has a coefficient of thermal expansion (CTE) from room temperature to 200° C. that is less than or equal to 11.0×10−6/° C.

A spark plug, comprising:

• a shell;
• an insulator disposed at least partially within the shell;
• a center electrode disposed at least partially within the insulator;
• and
• a ground electrode configured to form a spark gap (G) that is located between the ground electrode and the center electrode, wherein an electrode material for the center electrode, for the ground electrode, or for both the center electrode and the ground electrode includes greater than or equal to 32 wt % iron (Fe), greater than or equal to 36 wt % nickel (Ni), and one or more additional elements selected from aluminum (Al), chromium (Cr), and cobalt (Co), wherein the electrode material has a coefficient of thermal expansion (CTE) from room temperature to 200° C. that is less than or equal to 9.0×10−6/° C.