Stellite

/ ˈstɛlaɪt /

noun

any of various alloys containing cobalt, chromium, carbon, tungsten, and molybdenum: characteristically very hard and wear-resistant, they are used as castings or hard surface-coatings

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Needing a more durable spark plug electrode, he invented a precursor to his alloy, Stellite.

Stellite keeps a hard cutting edge and gets tougher as it gets hotter.

The following additional references may be useful: Stellite alloys in Jour.

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