ELECTRODE MATERIAL, SPARK-PLUG ELECTRODE, AND SPARK PLUG

摘要

An electrode material contains, on a mass percent basis, Al: 0.005% to 0.2%, Si: 0.2% to 1.6%, Cr: 0.05% to 1.0%, Ti: 0.05% to 0.5%, and Y: 0.2% to 1.0%. The remainder are Ni and inevitable impurities. The Si/Cr mass ratio is 1 or more. Because of the inclusion of specific amounts of Al, Si, Cr, and Y and the Si content higher than the Al content, the electrode material has an oxidation inhibiting effect. The inclusion of the specific amount of Ti can reduce the occurrence of expansion and cracking of the oxide film. Because of the inclusion of the specific amount of Y, the oxide film can maintain the microstructure even at high temperatures and have high resistance to high-temperature oxidation. Having a Si/Cr ratio of 1 or more, the oxide film has improved corrosion resistance and is resistant to corrosion by corrosive liquids.

主权项

1. An electrode material, comprising, on a mass percent basis:
0.005% or more and 0.2% or less Al; 0.2% or more and 1.6% or less Si; 0.05% or more and 1.0% or less Cr; 0.05% or more and 0.5% or less Ti; and 0.2% or more and 1.0% or less Y, the remainder being Ni and inevitable impurities, wherein the Si/Cr mass ratio is 1 or more.