Alpha alumina protective coatings for bond-coated substrates and

Coating processes – Direct application of electrical – magnetic – wave – or... – Electromagnetic or particulate radiation utilized

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4272557, 4274192, C23C 1640

Patent

active

056837615

ABSTRACT:
A bond-coated substrate is protected with an alpha alumina layer. The alpha alumina layer may be deposited as a relatively thick layer directly onto the bond-coated substrate. In this embodiment, no further ceramic layer overlies the alpha alumina layer. Other ceramics may be mixed into the alpha alumina layer, however. In another embodiment, a layer of a ceramic other than alpha alumina is deposited over the bond-coated substrate, and an alpha alumina layer is deposited over the ceramic layer.

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