Speak with Fizzle Brassbolts in the Shimmering Flats.
Indurium has an amazing resistance to heat! I'm sure it will work for Fizzle's pistons. But he'll need true indurium ore, not just the flakes.
To get the ore, it must be mined from deep within Uldaman, on the northern borders of the Badlands. That is the true source of indurium.
Send Fizzle Brassbolts my regards, and tell him what I told you.
Safe travels, [player]. And it won't surprise me if we meet again -- once Fizzle learns of indurium he'll probably send you to Uldaman to acquire it!