Farberware cooking pot thermal warping

Brief callback. Used as the everyday analogue for deliberately incomplete bonding in turbine coatings — aluminum-to-stainless cold bond with 10% bonded area to allow for thermal mismatch.

Remember the Farberware pot I showed you the other day. They didn't really want 100% bonding in that cold bonding of the aluminum base to the stainless steel pan, because if it was 100%, the difference between aluminum and steel when you go up 600 or 700° would cause warping. If you actually get only a 10% bonded joint — what's the stress on that aluminum at the bottom of a cooking pot? There's not a lot of stress compared to the area of bonding. You actually want porosity at that interface. They want porosity in the bond coat of these turbine coatings too, because what has a better ability to absorb strain than empty space? Voids are wonderful.