Method for making an abradable article

Details Method for making an abradable article Method for making an abradable article

1989-03-23

1990-06-26

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 36, 419 37, 419 38, 419 47, 419 54, 419 57, B22F 700

Patent

active

049370421

ABSTRACT:
A mixture of two powdered alloys of the M, Cr, Al type, M being Co and/or Ni, is disclosed, in one form, for use in providing an abradable surface of an article and is characterized by the substantial absence of B. The first alloy has substantially no Si and has a higher melting range than that of the second alloy. The second alloy has substantially no Y and consists essentially of, by weight, 8-12% Si, 1.5-4% Al, 10-30%Cr, with the balance M and incidental impurities. The total mixture composition consists essentially of, by weight, 10-35% Cr, 4-10% Al, from a small but effective amount up to about 0.09% Y, 2-6% Si, with the balance M and incidental impurities.

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