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Title: Iridium material for hydrothermal oxidation environments

A process for hydrothermal oxidation of combustible materials in which, during at least a part of the oxidation, corrosive material is present and makes contact with at least a portion of the apparatus over a contact area on the apparatus. At least a portion of the contact surface area comprises iridium, iridium oxide, an iridium alloy, or a base metal overlaid with an iridium coating. Iridium has been found to be highly resistant to environments encountered in the process of hydrothermal oxidation. Such environments typically contain greater than 50 mole percent water, together with oxygen, carbon dioxide, and a wide range of acids, bases and salts. Pressures are typically about 27.5 to about 1000 bar while temperatures range as high as C.
 [1];  [2]
  1. (Tewksbury, MA)
  2. (Brookline, MA)
Issue Date:
OSTI Identifier:
Modar, Inc. (Natick, MA) OSTI
Patent Number(s):
US 5527471
Contract Number:
Country of Publication:
United States
iridium; material; hydrothermal; oxidation; environments; process; combustible; materials; corrosive; makes; contact; portion; apparatus; surface; comprises; oxide; alloy; base; metal; overlaid; coating; found; highly; resistant; encountered; typically; contain; 50; mole; percent; water; oxygen; carbon; dioxide; wide; range; acids; bases; salts; pressures; 27; 1000; bar; temperatures; 800; degree; thermal oxidation; contact surface; carbon dioxide; mole percent; wide range; base metal; combustible material; typically contain; percent water; combustible materials; iridium alloy; oxidation environments; highly resistant; hydrothermal oxidation; corrosive material; makes contact; /210/422/