The most basic requirements for the electrodes that protrude into the combustion chamber are resistance to ablation (electro and chemical) and good thermal conductivity. With the development of materials science and process technology, electrode materials have undergone the evolution of iron, nickel, nickel-based alloys, nickel-copper composites, and precious metals. The most common type used today is a nickel based alloy. In general, pure metals have better thermal conductivity than alloys, but pure metals (such as nickel) are more sensitive to chemical corrosion reactions to combustion gases and the solid deposits they form than alloys. Therefore, the electrode material is added with elements such as chromium, manganese, silicon, etc., and the chromium improves the corrosion resistance, and the manganese and silicon improve the chemical corrosion resistance, especially the corrosion resistance of the sulfur oxide which is highly harmful. Nickel-based alloys are less thermally conductive than copper. The use of a copper core and its outer coating with a nickel-based alloy (or other precious metal alloy) will greatly improve the thermal conductivity of the electrode. The C in the domestic spark plug model suffix represents the copper core center electrode, and CC represents the double copper core electrode.
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