Wear-resistant coating for a nickel alloy part

Details Wear-resistant coating for a nickel alloy part Wear-resistant coating for a nickel alloy part

1993-08-26

1995-02-07

Walsh, Donald P.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

428546, 428547, 428548, 428554, B22F 704

Patent

active

053874714

ABSTRACT:
A coating for a part made of a nickel alloy of the following type: Cr: 15% to 20%, Co: 8% to 20%, Mo: 1.5% to 4%, Ti: 3% to 5%, Al: 3% to 3.5%, W: .ltoreq.3.8%, Fe: .ltoreq.1.2%, Nb: .ltoreq.0.9%, C: .ltoreq.0.1%, B: .ltoreq.0.01%, and Ta: .ltoreq.2.8%, the remainder being Ni, the coating having hardness of about 400 HV and including a plurality of layers (5', 5") of a wear-resistant cobalt-containing material of the following type: C: <1%, Cr: 26% to 30%, W: 18% to 21%, Ni: 4% to 6%, V: 0.75% to 1.15%, Fe: .ltoreq.3%, Mn .ltoreq.1%, Si: .ltoreq.1%, and B: .ltoreq.0.05%, the remainder being Co, said coating being characterized in that a buffer layer (5) is disposed between the part and the cobalt-containing layers (5', 5"), which buffer layer is made from a pre-alloyed powder having the following composition: Si: 0.7% to 2.9%, Cr: 11% to 26%, Fe: 0.5% to 3%, C: 0.35% to 0.85%, B: 0.3% to 1.35%, Ni: 20% to 69%, W: 3.6% to 16.8%, Mn .ltoreq.0.8%, and Co: 7% to 41.5%. The low-hardness region is reduced or is omitted.

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Japanese Patent Abstract 55-82775 dated Jun. 21, 1980.
LU-A-62 814--French Article.
French Search Report 9210317 dated Jun. 9, 1993.

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