Surface treatment to passivate sublimation surfaces to hydrophobic contaminants

摘要

The sublimation capability of a porous metal plate used in a sublimator is maintained by heating the porous metal plate at an elevated temperature in a flowing stream of oxygen for an extended period of time to form an oxidized surface. A short chain molecule, such as citric acid, is attached to the oxidized surface having multiple functional carboxylate groups and no hydrophobic tail.

主权项

1. A sublimator porous plate comprising:
a porous metal plate having a porous passivated surface consisting essentially of:
a first passivated portion including an uncharged oxide; anda second passivated portion including a plurality of short chain molecules attached to metal cations, each short chain molecule having multiple functional carboxylate groups and no hydrophobic tail.