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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Failure of the Bond Between a Cobalt Alloy Prosthetic Casting and a Sintered Porous Coating

By
Mark Lisin
Mark Lisin
Precision Castparts Corporation
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;
Robert R. Peterson
Robert R. Peterson
Richards Medical Company
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Published:
1992
Page range:
449 - 451

Abstract

A femoral knee implant was returned to the casting vendor for analysis after exhibiting poor bond strength between the cast substrate and a sintered porous coating. Both the coating and the substrate were manufactured from a cobalt-chromium-molybdenum alloy. Metallographic analysis indicated that a decarburized layer existed on all surfaces of the casting, which prevented bonding during the sintering thermal cycle. Bead-to-bead bonding within the coating appeared sufficient, and no decarburized layer was present on the bead surfaces. It was concluded that the decarburization did not occur during the sintering thermal cycle. It was recommended that the prosthetic manufacturer investigate atmosphere controls for all thermal cycles prior to coating.

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Mark Lisin, Robert R. Peterson, 1992. "Failure of the Bond Between a Cobalt Alloy Prosthetic Casting and a Sintered Porous Coating", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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