Friction and wear of sintered fibermetal abradable seal materialsThree abradable gas-path seal-material systems based on a sintered NiCrAlY fiber metal structure were evaluated under a range of wear conditions representative of those likely to be encountered in various knife-edge seal (labyrinth or shrouded turbine) applications. Conditions leading to undesirable wear of the rotating knife were identified, and a model proposed based on thermal effects arising under different rub conditions. It was found, and predicted by the model, that low incursion (plunge) rates tended to promote smearing of the low-density sintered material with consequent wear to the knife edge. Tradeoff benefits between baseline 19 percent dense material, a similar material of increased density, and a self-lubricating coating applied to the 19 percent dense material were identified on the basis of relative rub tolerance and erosion resistance.
Document ID
19780039542
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bill, R. C. (NASA Lewis Research Center; U.S. Army, Air Mobility Research and Development Laboratory, Cleveland Ohio, United States)
Shiembob, L. T. (United Technologies Corp. Pratt and Whitney Aircraft Group, East Hartford, Conn., United States)
Date Acquired
August 9, 2013
Publication Date
April 1, 1977
Subject Category
Metallic Materials
Meeting Information
Meeting: International Conference on Wear of Materials