Open-cell 80-ppi molybdenum foam with 0.030" porous molybdenum liner used in transpiration-cooled combustion chambers. Left, unpolished (10×); right, polished (40×).

Open-cell 80-ppi molybdenum foam with 0.030″ porous molybdenum liner used in transpiration-cooled combustion chambers. Left, unpolished (10×); right, polished (40×).