Abradable seal material and composition thereof

Details Abradable seal material and composition thereof Abradable seal material and composition thereof

C - Chemistry, Metallurgy

22

C

75/1

C22C 1/04 (2006.01) C22C 1/09 (1980.01)

Patent

CA 1085652

ABRADABLE SEAL MATERIAL AND COMPOSITION THEREOF ABSTRACT OF THE DISCLOSURE An abradable seal material suitable for high tempera- ture application in turbomachinery comprising a sintered mat of (1) randomly disposed fine metal fibers, or (2) fine metal powders or (3) both fibers and powders. The metal fiber and powder are com- posed of an alloy consisting essentially of I, Al, Cr, II, or I, Al, Cr, III, wherein I is at least one member of the group Fe, Co, Ni, and Co plus Ni, II is a member of the group consisting of Y, Sc and Rare Earths, and III is at least one member of the group consisting of Si, Hf, Zr, Cb, and Ta. The exposed surfaces of the fibers and powder forming the seal are protected against oxidation at high temperatures by a coating of Al2O3 which is formed on the substrate. Said substrate has an Al content of at least 4% to re- place spalled Al2O3 and for "healing" any Al2O3 scale fractures.

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