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Platinum group of metals (PGM) are very resistant to extreme heat. Why is platinum never mentioned in aerospace world? Is this a top secret?

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To elaborate on mins comment: platinum right now is selling for around \$1000 / troy ounce, which is ~\$14,500 / pound. Nickel is selling for around \$4 / pound and cobalt is \$25/pound. Nickel and cobalt super alloys have sufficient temperature capability for jet engine applications. So the choice is clear. Platinum is not mentioned because it is not used.

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