Porous metal structures made by thermal spraying fugitive...

Details Porous metal structures made by thermal spraying fugitive... Porous metal structures made by thermal spraying fugitive...

C - Chemistry, Metallurgy

23

C

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C23C 4/18 (2006.01) C23C 4/04 (2006.01) C23C 20/00 (2006.01) F01D 11/12 (2006.01)

Patent

CA 1230017

-18- Abstract Porous Metal Structures Made by Thermal Spraying Fugitive Material and Metal Porous metal deposits especially useful in gas turbine engines as compressor seals are made by thermal spraying a metal powder and a meltable polymer powder mixture, wherein the spraying process and a subsequent polymer removal process are chosen to produce less than 30 weight percent oxide. Oxide contents of 4-25% are typical. When 86 weight percent nichrome is sprayed wth 14 weight percent polymethylmethacrylate the polymer is removed by heating in air to about 315°C. The resultant porous structure will have an oxide content of 7% and an apparent density of about 32%. A meltable polymer additionally produces a more desirable pore structure.

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