Development of Abrasive Blade Tip Coatings for Use in an Abradable Turbine Gas Path Seal System.

Abstract

An abrasive blade tip treatment coating was developed which exhibited promising rub resistance against ceramic (graded ZrO2-Ni Cr) outer air seals. This blade/seal system was designed for advanced high pressure turbine sealing applications. The best tip treatment was produced by vacuum hot pressing a compact comprised of 50 volume percent of coated 8-mil diameter silicon carbide (SiC) grits in a MERL 711 (CoNiCrAlY) alloy matrix. The SiC grits were radio frequency (RF) sputter coated with a 0.1-mil thick aluminum oxide diffusion barrier coating prior to insertion in the matrix. This compact was transient liquid phase bonded to prepared rig and engine blade tips. The abrasive blade tip withstood fabrication, bonding, and heat treatment cycles with little or no grit dissolution and degradation. Blade/seal dynamic rub tests produced little blade tip wear (compared with seal wear) with no dynamic rub impact problems or any loss of abrasive blade tip treatment structural integrity. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1977
Accession Number
ADA051800

Entities

People

  • Matthew J. Wallace

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Air Force
  • Aluminum Oxides
  • Ceramic Materials
  • Chemical Vapor Deposition
  • Contracts
  • Electron Microscopes
  • Fabrication
  • Governments
  • Heat Treatment
  • High Temperature
  • Materials
  • Materials Laboratories
  • Microscopes
  • Scanning Electron Microscopes
  • Silicon Carbide
  • Tensile Strength
  • Turbines

Fields of Study

  • Materials science

Readers

  • Aerospace Engineering
  • Surface Coatings Technology.
  • Surface Engineering/Surface Coating Technology.